Re: [AFMUG] optical TX power levels

[fiberrun]

You'll probably have to ask for quotes to get good pricing from you local 
supplier, but Edgeoptic lists 100G 80km optics for $1550.


- Jared
 
 
 

Sent: Friday, January 26, 2024 
From: "Zach Underwood" 
To: "AnimalFarm Microwave Users Group" 
Subject: Re: [AFMUG] optical TX power levels

Jared, do you have another vendor for 100gb 80km optics other than 
fs.com[http://fs.com] and what does the price point look like?
 
I sent over the notes to the fiber provider yesterday, still waiting to hear 
back.  

On Fri, Jan 26, 2024 at 7:05 AM mailto:fiber...@mail.com]> 
wrote:On Friday, January 26, 2024 Chuck McCown wrote:
> Could he bond dwm multiples at lower rates?
  Yes. Needs a muxponder or do a breakout at both ends to do it transparently. 
Just bonding the links is obviously also an option.

On Tuesday, January 23, 2024 Zach Underwood wrote:
> My sample size is small due to the optices costing $4k each
  My suggestion is that you immediately change suppliers at prices like that.

  FYI, I never got the original post to the list. Is the list somehow broken? 
It's been awfully quiet lately in either case.


- Jared


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Re: [AFMUG] optical TX power levels

[dmmoffett]

UmmI think I need to clarify that I did not intend any double entendre
with that final comment.

I was recalling back to a training session where we were to test attenuation
on a connector before and after cleaning it.  One of my colleagues licked
his finger and wiped the ferrule with it.  He got the lowest attenuation
value in the class. He bottomed out the reading on the meter at 0.0dB.  Not
recommended though.  Water erodes the surface of glass, and bacteria from
your mouth might grow on it too.  It was just hilarious that it worked that
well.  I was honestly thinking it's too bad you can't lick inside the LC
socket on the transceiver, and not trying to make any sex joke.  I am too
old and too bald to talk like that.

-Adam


-Original Message-
From: dmmoff...@gmail.com  
Sent: Friday, January 26, 2024 2:11 PM
To: 'AnimalFarm Microwave Users Group' 
Subject: RE: [AFMUG] optical TX power levels

Personally, I'd have no objection to LACP on 4x25G links if that's what gets
the job done.   I think you should be able to configure the Arista that way
and it'll just show up as 4 sub-interfaces like et1/1, et1/2, et1/3, et1/4.

With reflectance -20 I'd still go stab all the connectors with a 1-click
cleaner before I look for any issue more complicated than that.
Combo pack on Amazon for $18.99 has both ferrule sizes: https://t.ly/bHMfU
They're one-click, but they're so cheap don't be afraid to double-tap or
triple-tap just to be sure you got it.

At -20 reflectance there's junk on the ferrule.  You'd get an improvement
just from licking it.  Hard to get your tongue inside the female port
though.

-Adam


-Original Message-
From: AF  On Behalf Of fiber...@mail.com
Sent: Friday, January 26, 2024 7:04 AM
To: af@af.afmug.com
Subject: Re: [AFMUG] optical TX power levels

On Friday, January 26, 2024 Chuck McCown wrote:
> Could he bond dwm multiples at lower rates?
  Yes. Needs a muxponder or do a breakout at both ends to do it
transparently. Just bonding the links is obviously also an option.

On Tuesday, January 23, 2024 Zach Underwood wrote:
> My sample size is small due to the optices costing $4k each
  My suggestion is that you immediately change suppliers at prices like
that.

  FYI, I never got the original post to the list. Is the list somehow
broken? It's been awfully quiet lately in either case.


- Jared


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Re: [AFMUG] optical TX power levels

[dmmoffett]

Personally, I'd have no objection to LACP on 4x25G links if that's what gets
the job done.   I think you should be able to configure the Arista that way
and it'll just show up as 4 sub-interfaces like et1/1, et1/2, et1/3, et1/4.

With reflectance -20 I'd still go stab all the connectors with a 1-click
cleaner before I look for any issue more complicated than that.
Combo pack on Amazon for $18.99 has both ferrule sizes: https://t.ly/bHMfU
They're one-click, but they're so cheap don't be afraid to double-tap or
triple-tap just to be sure you got it.

At -20 reflectance there's junk on the ferrule.  You'd get an improvement
just from licking it.  Hard to get your tongue inside the female port
though.

-Adam


-Original Message-
From: AF  On Behalf Of fiber...@mail.com
Sent: Friday, January 26, 2024 7:04 AM
To: af@af.afmug.com
Subject: Re: [AFMUG] optical TX power levels

On Friday, January 26, 2024 Chuck McCown wrote:
> Could he bond dwm multiples at lower rates?
  Yes. Needs a muxponder or do a breakout at both ends to do it
transparently. Just bonding the links is obviously also an option.

On Tuesday, January 23, 2024 Zach Underwood wrote:
> My sample size is small due to the optices costing $4k each
  My suggestion is that you immediately change suppliers at prices like
that.

  FYI, I never got the original post to the list. Is the list somehow
broken? It's been awfully quiet lately in either case.


- Jared


-- 
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AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com


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Re: [AFMUG] optical TX power levels

[Trey Scarborough]

Depends on your definition or "Low-Cost"...


Ufispace S9510-28DC is a well priced switch that can do 400G Openzr.

Juniper ACX7100, but you will need to buy there optics or they charge 
you a license fee for using Openzr.


Nokia 7250 IXR-e2


Yes they should work with just about any passive system. They supposedly 
work on 50ghz channels, but Ive never tried, and I no it limits your 
speeds down to 100 or 200g. I have used it with 75ghz and 100ghz 
passive  systems. Most have around a 28db link budget so probably a 
little better than any 80k 10G solutions you are currently using. Also 
its a coherent signal so you don't have to worry about dispersion.




On 1/26/24 8:17 AM, Mike Hammett wrote:

What are some low-cost switches that support the 400G OpenZR optics?

Can you get 400G OpenZR optics in a passive mux-friendly channel plan?



-
Mike Hammett
Intelligent Computing Solutions <http://www.ics-il.com/>
<https://www.facebook.com/ICSIL><https://plus.google.com/+IntelligentComputingSolutionsDeKalb><https://www.linkedin.com/company/intelligent-computing-solutions><https://twitter.com/ICSIL>
Midwest Internet Exchange <http://www.midwest-ix.com/>
<https://www.facebook.com/mdwestix><https://www.linkedin.com/company/midwest-internet-exchange><https://twitter.com/mdwestix>
The Brothers WISP <http://www.thebrotherswisp.com/>
<https://www.facebook.com/thebrotherswisp>


<https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>

*From: *"Trey Scarborough" 
*To: *af@af.afmug.com
*Sent: *Thursday, January 25, 2024 5:00:58 PM
*Subject: *Re: [AFMUG] optical TX power levels

Ive done a lot of these 100G 80k links and its not likely dispersion 
causing your problem. Its more likely the opposite. If you have 
segments of NZ fiber "Non-zero dispersion-shifted fiber" you can have 
issues. After looking at your OTDR it looks to be a mix of different 
fiber types thats how you get the negative loss splices. If it is a 
mix of NZ and smf28 fiber your probably not going to be able to get it 
to work. The NZ fiber causes issues with the 1200-1300 signals on 
those optics. I have had spans of 50k that 80k optics would not work 
on due to this. I would have them run an OTDR at 1310 and see what it 
shows you are likely to get a very different looking result. If that's 
the case there aren't too many good options. Your best is if your 
switch has 400g ports get some OpenZR 400G optics and use them. 
Surprisingly that aren't incredibly more expensive than the 100G 80ks.


I would have the fiber provider give you a 1310 OTDR and also request 
fiber type information for the span. We build these things all the 
time so if you need some help feel free to email me and I can see 
about finding a solution that will work for you.


On 1/24/24 6:40 PM, Zach Underwood wrote:

Ok we got the report back from the fiber supplier. This is new to
me so anyone can offer insight into it?

PDF

https://drive.google.com/file/d/1KeIuWHFsiKZHxcmpPiY8PX_-PABl55Sz/view?usp=sharing


On Wed, Jan 24, 2024 at 6:00 PM Daniel Pautz via AF
mailto:af@af.afmug.com>> wrote:

Dispersion compensation module -
https://www.fs.com/products/65783.html

*From:*AF mailto:af-boun...@af.afmug.com>> *On Behalf Of *Ken Hohhof
*Sent:* Wednesday, January 24, 2024 3:53 PM
    *To:* 'AnimalFarm Microwave Users Group' mailto:af@af.afmug.com>>
*Subject:* Re: [AFMUG] optical TX power levels

I spent a few minutes searching on the term DCM and came up
with “chirped fiber Bragg grating”.

https://en.wikipedia.org/wiki/Fiber_Bragg_grating

OK, I’m out of my depth now.

*From:*AF mailto:af-boun...@af.afmug.com>> *On Behalf Of *Daniel Pautz
via AF
*Sent:* Wednesday, January 24, 2024 4:40 PM
*To:* AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
*Cc:* Daniel Pautz mailto:d...@webnx.com>>
*Subject:* Re: [AFMUG] optical TX power levels

Perhaps pick up a used cheap DCM and see if it helps, 
adjustable  preferred if not as close to the fiber distance.  
Our newest 100G dwdm build (dozen 100G optics) very much
needed a DCM on it.

*From:*AF mailto:af-boun...@af.afmug.com>> *On Behalf Of *Chuck McCown
via AF
*Sent:* Wednesday, January 24, 2024 3:36 PM
*To:* 'AnimalFarm Microwave Users Group' mailto:af@af.afmug.com>>
*Cc:* ch...@go-mtc.com <mailto:ch...@go-mtc.com>
*Subject:* Re: [AFMUG] optical TX power levels

Gotta think of the Fourier series of the pulse.  Yes group
velocities or group delay of the whole enchalada.  It is all
kinda the same thing.  They were doing some kind of soliton
   

Re: [AFMUG] optical TX power levels

[Mike Hammett]

What are some low-cost switches that support the 400G OpenZR optics? 


Can you get 400G OpenZR optics in a passive mux-friendly channel plan? 




- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 




- Original Message -

From: "Trey Scarborough"  
To: af@af.afmug.com 
Sent: Thursday, January 25, 2024 5:00:58 PM 
Subject: Re: [AFMUG] optical TX power levels 


Ive done a lot of these 100G 80k links and its not likely dispersion causing 
your problem. Its more likely the opposite. If you have segments of NZ fiber 
"Non-zero dispersion-shifted fiber" you can have issues. After looking at your 
OTDR it looks to be a mix of different fiber types thats how you get the 
negative loss splices. If it is a mix of NZ and smf28 fiber your probably not 
going to be able to get it to work. The NZ fiber causes issues with the 
1200-1300 signals on those optics. I have had spans of 50k that 80k optics 
would not work on due to this. I would have them run an OTDR at 1310 and see 
what it shows you are likely to get a very different looking result. If that's 
the case there aren't too many good options. Your best is if your switch has 
400g ports get some OpenZR 400G optics and use them. Surprisingly that aren't 
incredibly more expensive than the 100G 80ks. 

I would have the fiber provider give you a 1310 OTDR and also request fiber 
type information for the span. We build these things all the time so if you 
need some help feel free to email me and I can see about finding a solution 
that will work for you. 


On 1/24/24 6:40 PM, Zach Underwood wrote: 



Ok we got the report back from the fiber supplier. This is new to me so anyone 
can offer insight into it? 


PDF 
https://drive.google.com/file/d/1KeIuWHFsiKZHxcmpPiY8PX_-PABl55Sz/view?usp=sharing
 


On Wed, Jan 24, 2024 at 6:00 PM Daniel Pautz via AF < af@af.afmug.com > wrote: 






Dispersion compensation module - https://www.fs.com/products/65783.html 



From: AF < af-boun...@af.afmug.com > On Behalf Of Ken Hohhof 
Sent: Wednesday, January 24, 2024 3:53 PM 
To: 'AnimalFarm Microwave Users Group' < af@af.afmug.com > 
Subject: Re: [AFMUG] optical TX power levels 

I spent a few minutes searching on the term DCM and came up with “chirped fiber 
Bragg grating”. 
https://en.wikipedia.org/wiki/Fiber_Bragg_grating 

OK, I’m out of my depth now. 




From: AF < af-boun...@af.afmug.com > On Behalf Of Daniel Pautz via AF 
Sent: Wednesday, January 24, 2024 4:40 PM 
To: AnimalFarm Microwave Users Group < af@af.afmug.com > 
Cc: Daniel Pautz < d...@webnx.com > 
Subject: Re: [AFMUG] optical TX power levels 

Perhaps pick up a used cheap DCM and see if it helps, adjustable preferred if 
not as close to the fiber distance. Our newest 100G dwdm build (dozen 100G 
optics) very much needed a DCM on it. 



From: AF < af-boun...@af.afmug.com > On Behalf Of Chuck McCown via AF 
Sent: Wednesday, January 24, 2024 3:36 PM 
To: 'AnimalFarm Microwave Users Group' < af@af.afmug.com > 
Cc: ch...@go-mtc.com 
Subject: Re: [AFMUG] optical TX power levels 




Gotta think of the Fourier series of the pulse. Yes group velocities or group 
delay of the whole enchalada. It is all kinda the same thing. They were doing 
some kind of soliton fiber development. Haven’t heard much for some time about 
that. No idea how frequency pure/coherent the tx is. I imagine phase coherency 
is a big deal. 










From: Ken Hohhof 

Sent: Wednesday, January 24, 2024 4:12 PM 

To: 'AnimalFarm Microwave Users Group' 

Subject: Re: [AFMUG] optical TX power levels 



Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?). 

Is this because the transmitter doesn’t generate literally a single wavelength? 
Or is this a WDM issue? Chuck says the pulses get smeared out in time, that 
sounds like the first one. 



From: AF < af-boun...@af.afmug.com > On Behalf Of Chuck McCown via AF 
Sent: Wednesday, January 24, 2024 3:56 PM 
To: AnimalFarm Microwave Users Group < af@af.afmug.com > 
Cc: ch...@go-mtc.com 
Subject: Re: [AFMUG] optical TX power levels 




Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion. Similar to trying to use too high level of QAM with SNR issues. 




From: Josh Luthman 



Sent: Wednesday, January 24, 2024 12:26 PM 

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels 




Even if the RX level is good? 

> rx was within 0.3dBm on all 4 lanes on both sides 




On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF < af@af.afmug.com > wrote: 





Yeah makes me think the two paths have different loss. We have had that on 
mirrored paths, or even single paths with crappy splices on one of the strands. 



From: AF < af-boun...@af.afmug.com > On Behalf Of Chuck McCown via AF 
Sent: Wednesday, January 24, 2024 11:12 

Re: [AFMUG] optical TX power levels

[Trey Scarborough]

you can bond 4x25g dwdm optics, but you would need amps and filters and 
eveything it would probably come out to more than a couple openzr400G 
optics. Most are good to 120k bare fiber. If you don't have 400g ports 
you can always use a 4x100 muxponder.



4k for 100g 80k optics isn't a bad price unless your buying 100s of them.

On 1/26/2024 6:03 AM, fiber...@mail.com wrote:

On Friday, January 26, 2024 Chuck McCown wrote:

Could he bond dwm multiples at lower rates?

   Yes. Needs a muxponder or do a breakout at both ends to do it transparently. 
Just bonding the links is obviously also an option.

On Tuesday, January 23, 2024 Zach Underwood wrote:

My sample size is small due to the optices costing $4k each

   My suggestion is that you immediately change suppliers at prices like that.

   FYI, I never got the original post to the list. Is the list somehow broken? 
It's been awfully quiet lately in either case.


- Jared




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Re: [AFMUG] optical TX power levels

[Zach Underwood]

Jared, do you have another vendor for 100gb 80km optics other than fs.com
and what does the price point look like?

I sent over the notes to the fiber provider yesterday, still waiting to
hear back.

On Fri, Jan 26, 2024 at 7:05 AM  wrote:

> On Friday, January 26, 2024 Chuck McCown wrote:
> > Could he bond dwm multiples at lower rates?
>   Yes. Needs a muxponder or do a breakout at both ends to do it
> transparently. Just bonding the links is obviously also an option.
>
> On Tuesday, January 23, 2024 Zach Underwood wrote:
> > My sample size is small due to the optices costing $4k each
>   My suggestion is that you immediately change suppliers at prices like
> that.
>
>   FYI, I never got the original post to the list. Is the list somehow
> broken? It's been awfully quiet lately in either case.
>
>
> - Jared
>
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>


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Re: [AFMUG] optical TX power levels

[fiberrun]

On Friday, January 26, 2024 Chuck McCown wrote:
> Could he bond dwm multiples at lower rates?
  Yes. Needs a muxponder or do a breakout at both ends to do it transparently. 
Just bonding the links is obviously also an option.

On Tuesday, January 23, 2024 Zach Underwood wrote:
> My sample size is small due to the optices costing $4k each
  My suggestion is that you immediately change suppliers at prices like that.

  FYI, I never got the original post to the list. Is the list somehow broken? 
It's been awfully quiet lately in either case.


- Jared


-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Chuck McCown via AF]

Could he bond dwm multiples at lower rates?

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell 
www.mccowntech.com
www.microtrench-blades.com
www.terabitnetworks.com


From: Trey Scarborough 
Sent: Thursday, January 25, 2024 5:00 PM
To: af@af.afmug.com 
Subject: Re: [AFMUG] optical TX power levels

Ive done a lot of these 100G 80k links and its not likely dispersion causing 
your problem. Its more likely the opposite. If you have segments of NZ fiber 
"Non-zero dispersion-shifted fiber" you can have issues. After looking at your 
OTDR it looks to be a mix of different fiber types thats how you get the 
negative loss splices. If it is a mix of NZ and smf28 fiber your probably not 
going to be able to get it to work. The NZ fiber causes issues with the 
1200-1300 signals on those optics. I have had spans of 50k that 80k optics 
would not work on due to this. I would have them run an OTDR at 1310 and see 
what it shows you are likely to get a very different looking result. If that's 
the case there aren't too many good options. Your best is if your switch has 
400g ports get some OpenZR 400G optics and use them. Surprisingly that aren't 
incredibly more expensive than the 100G 80ks. 


I would have the fiber provider give you a 1310 OTDR and also request fiber 
type information for the span. We build these things all the time so if you 
need some help feel free to email me and I can see about finding a solution 
that will work for you.



On 1/24/24 6:40 PM, Zach Underwood wrote:

  Ok we got the report back from the fiber supplier. This is new to me so 
anyone can offer insight into it? 

  PDF 
https://drive.google.com/file/d/1KeIuWHFsiKZHxcmpPiY8PX_-PABl55Sz/view?usp=sharing
 

  On Wed, Jan 24, 2024 at 6:00 PM Daniel Pautz via AF  wrote:

Dispersion compensation module - https://www.fs.com/products/65783.html



From: AF  On Behalf Of Ken Hohhof
Sent: Wednesday, January 24, 2024 3:53 PM
To: 'AnimalFarm Microwave Users Group' 
Subject: Re: [AFMUG] optical TX power levels



I spent a few minutes searching on the term DCM and came up with “chirped 
fiber Bragg grating”.

https://en.wikipedia.org/wiki/Fiber_Bragg_grating



OK, I’m out of my depth now.





From: AF  On Behalf Of Daniel Pautz via AF
Sent: Wednesday, January 24, 2024 4:40 PM
To: AnimalFarm Microwave Users Group 
Cc: Daniel Pautz 
Subject: Re: [AFMUG] optical TX power levels



Perhaps pick up a used cheap DCM and see if it helps,  adjustable  
preferred if not as close to the fiber distance.   Our newest 100G dwdm build 
(dozen 100G optics) very much needed a DCM on it.   



From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:36 PM
To: 'AnimalFarm Microwave Users Group' 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels



Gotta think of the Fourier series of the pulse.  Yes group velocities or 
group delay of the whole enchalada.  It is all kinda the same thing.  They were 
doing some kind of soliton fiber development.  Haven’t heard much for some time 
about that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal. 







From: Ken Hohhof 

Sent: Wednesday, January 24, 2024 4:12 PM

To: 'AnimalFarm Microwave Users Group' 

Subject: Re: [AFMUG] optical TX power levels



Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).



Is this because the transmitter doesn’t generate literally a single 
wavelength?  Or is this a WDM issue?  Chuck says the pulses get smeared out in 
time, that sounds like the first one.



From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels



Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.  



From: Josh Luthman 

Sent: Wednesday, January 24, 2024 12:26 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels



Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides



On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF  wrote:

  Yeah makes me think the two paths have different loss.   We have had that 
on mirrored paths,  or even single paths with crappy splices on one of the 
strands.  



  From: AF  On Behalf Of Chuck McCown via AF
  Sent: Wednesday, January 24, 2024 11:12 AM
  To: AnimalFarm Microwave Users Group 
  Cc: ch...@go-mtc.com
  Subject: Re: [AFMUG] optical TX power levels



  Did anyone do dispersion testing on the fiber?



  Chuck McCown
  McCown Technology Corporation
  8401 

Re: [AFMUG] optical TX power levels

[Trey Scarborough]

Ive done a lot of these 100G 80k links and its not likely dispersion 
causing your problem. Its more likely the opposite. If you have segments 
of NZ fiber "Non-zero dispersion-shifted fiber" you can have issues. 
After looking at your OTDR it looks to be a mix of different fiber types 
thats how you get the negative loss splices. If it is a mix of NZ and 
smf28 fiber your probably not going to be able to get it to work. The NZ 
fiber causes issues with the 1200-1300 signals on those optics. I have 
had spans of 50k that 80k optics would not work on due to this. I would 
have them run an OTDR at 1310 and see what it shows you are likely to 
get a very different looking result. If that's the case there aren't too 
many good options. Your best is if your switch has 400g ports get some 
OpenZR 400G optics and use them. Surprisingly that aren't incredibly 
more expensive than the 100G 80ks.


I would have the fiber provider give you a 1310 OTDR and also request 
fiber type information for the span. We build these things all the time 
so if you need some help feel free to email me and I can see about 
finding a solution that will work for you.


On 1/24/24 6:40 PM, Zach Underwood wrote:
Ok we got the report back from the fiber supplier. This is new to me 
so anyone can offer insight into it?


PDF 
https://drive.google.com/file/d/1KeIuWHFsiKZHxcmpPiY8PX_-PABl55Sz/view?usp=sharing 



On Wed, Jan 24, 2024 at 6:00 PM Daniel Pautz via AF <mailto:af@af.afmug.com>> wrote:


Dispersion compensation module -
https://www.fs.com/products/65783.html

*From:*AF mailto:af-boun...@af.afmug.com>> *On Behalf Of *Ken Hohhof
*Sent:* Wednesday, January 24, 2024 3:53 PM
*To:* 'AnimalFarm Microwave Users Group' mailto:af@af.afmug.com>>
    *Subject:* Re: [AFMUG] optical TX power levels

I spent a few minutes searching on the term DCM and came up with
“chirped fiber Bragg grating”.

https://en.wikipedia.org/wiki/Fiber_Bragg_grating

OK, I’m out of my depth now.

*From:*AF mailto:af-boun...@af.afmug.com>> *On Behalf Of *Daniel Pautz via AF
*Sent:* Wednesday, January 24, 2024 4:40 PM
*To:* AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
*Cc:* Daniel Pautz mailto:d...@webnx.com>>
    *Subject:* Re: [AFMUG] optical TX power levels

Perhaps pick up a used cheap DCM and see if it helps, adjustable 
preferred if not as close to the fiber distance.   Our newest 100G
dwdm build (dozen 100G optics) very much needed a DCM on it.

*From:*AF mailto:af-boun...@af.afmug.com>> *On Behalf Of *Chuck McCown via AF
*Sent:* Wednesday, January 24, 2024 3:36 PM
*To:* 'AnimalFarm Microwave Users Group' mailto:af@af.afmug.com>>
*Cc:* ch...@go-mtc.com <mailto:ch...@go-mtc.com>
*Subject:* Re: [AFMUG] optical TX power levels

Gotta think of the Fourier series of the pulse.  Yes group
velocities or group delay of the whole enchalada.  It is all kinda
the same thing. They were doing some kind of soliton fiber
development.  Haven’t heard much for some time about that.  No
idea how frequency pure/coherent the tx is.  I imagine phase
coherency is a big deal.

*From:*Ken Hohhof

*Sent:*Wednesday, January 24, 2024 4:12 PM

    *To:*'AnimalFarm Microwave Users Group'

*Subject:*Re: [AFMUG] optical TX power levels

Looks like different wavelengths have different group velocities,
so compensation is possible (but probably not cheap?).

Is this because the transmitter doesn’t generate literally a
single wavelength?  Or is this a WDM issue?  Chuck says the pulses
get smeared out in time, that sounds like the first one.

*From:*AF mailto:af-boun...@af.afmug.com>> *On Behalf Of *Chuck McCown via AF
*Sent:* Wednesday, January 24, 2024 3:56 PM
*To:* AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
    *Cc:* ch...@go-mtc.com <mailto:ch...@go-mtc.com>
*Subject:* Re: [AFMUG] optical TX power levels

Yeah, the pulses tend to get smeared out in time if there is too
much dispersion. Similar to trying to use too high level of QAM
with SNR issues.

*From:*Josh Luthman

*Sent:*Wednesday, January 24, 2024 12:26 PM

    *To:*AnimalFarm Microwave Users Group

*Subject:*Re: [AFMUG] optical TX power levels

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF
mailto:af@af.afmug.com>> wrote:

Yeah makes me think the two paths have different loss.   We
have had that on mirrored paths, or even single paths with
crappy splices on one of the strands.

*From:*AF mailto:af-boun...@af.afmug.com>> *On Behalf Of *Chuck McCown
via AF
*Sent:* Wednesday, January 24, 2024 11:12 AM
*To:* AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
 

Re: [AFMUG] optical TX power levels

[dmmoffett]

Out of curiosity, what did the provider tell you about this trace?  The -20 and 
-15 reflectance stand out pretty loud and clear.  If their OTDR has a “smart” 
mode it would have flagged those as failures.  If they didn’t see a problem 
here they might need a test device smarter than they are.

 

 

From: AF  On Behalf Of Zach Underwood
Sent: Thursday, January 25, 2024 10:26 AM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] optical TX power levels

 

wow thanks for the detail, I will work with the boss and the fiber provider to 
try to address some of those problems.

 

On Thu, Jan 25, 2024 at 10:14 AM mailto:dmmoff...@gmail.com> > wrote:

As an OTDR trace it looks really good, but your problem might be at event 18 
and/or 19.   I don’t know how much you wanted to know so I apologize if I’m 
starting too far towards the beginning.

 

#18 is around 100m from the end and has reflectance of -21.36.  That’s crappy.  

The -15 below it is even crappier.

 

A UPC connector should be -40 to -50 dB

An APC connector should be better than -55 or -60 depending on who you believe. 

 

If the distance is correct then maybe #18 is a cross connect panel?  #19 should 
be your Arista.  Start with re-cleaning those connectors.  One-click cleaners 
are fast and cheap.  They only shot this in one direction, so we don’t know 
about the connectors on the other end.  I’d clean it on both sides.

 

The line graph is showing you attenuation over distance.  You’re averaging 
under 0.2dB per Km so that’s really good.  The table below is showing you 19 
events.  An event is any point along the graph where attenuation suddenly 
increased.  Events are either “reflective” or “non-reflective”.  In the first 
column of the table they’re showing you a /R or /N for reflective or 
non-reflective.  You can also tell that in the line graph because reflective 
events will have a spike before the dip. You don’t want reflections.  
Reflections are given in a -dB and you want it farther from zero (i.e.: -55 
reflectance is better than -40 reflectance).

 

(And side comment: reflectance is the same thing as return loss, but in optics 
people seem to prefer the term “reflectance”.  The only difference is return 
loss should be indicated with a positive number and reflectance is negative.  

Return Loss = 10*log(incident power/reflected power) in +dB

   Reflectance = 10*log(reflected power/incident power) in -dB

)

 

Non-reflective events are things adding attenuation but not adding reflectance. 
 Those would be fusion splices, coils, and bends.  

 

Reflective events mean there’s an exposed face of glass.  Those would be 
mechanical splices or connectors.  Reflective events could also be a fault in 
the fiber like a bubbled fusion splice.  

 

All that noise at the end of the line shows where the dead end is.

 

On that test result the only event I don’t like along the middle of the run is 
#9.  4dB is a lot for one event.  It might be a less than perfect splice, a 
tight bend in a splice tray, a slack coil that’s too tight, or whatever.  It’s 
not enough to ruin this link, and it’s probably ok if it stays at 4dB forever.  
There are some underground cases where I’ve seen the same high attenuation 
events for years, but they’re not hurting us and it’s too much trouble to 
access the case to fix something that isn’t currently a problem.

 

If nobody ever said this before: you should clean connectors every time they 
are handled.  No matter what anybody tells you, the caps they come with are not 
“dust caps” and they won’t keep it clean; the caps are there so the glass face 
doesn’t get scratched.  When I’m plugging things in I clean the jack, clean the 
plug, and then treat it like I’m playing the old Operation game:  If the 
ferrule touches anything before it goes into the hole then it’s “Bzt!” and 
reclean it.

 

The dispersion thing is a new concept for me, and I don’t think you could 
diagnose it from this one trace.  From what I’m gathering in this thread, I 
think you’d have to shoot it on multiple wavelengths and compare the 
differences.  This trace is only at 1550nm.  

 

-Adam

 

 

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Zach Underwood
Sent: Wednesday, January 24, 2024 7:41 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com> >
Subject: Re: [AFMUG] optical TX power levels

 

Ok we got the report back from the fiber supplier. This is new to me so anyone 
can offer insight into it?

 

PDF 
https://drive.google.com/file/d/1KeIuWHFsiKZHxcmpPiY8PX_-PABl55Sz/view?usp=sharing
 

 

On Wed, Jan 24, 2024 at 6:00 PM Daniel Pautz via AF mailto:af@af.afmug.com> > wrote:

Dispersion compensation module - https://www.fs.com/products/65783.html

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Ken Hohhof
Sent: Wednesday, January 24, 2024 3:53 PM
To: 'AnimalFarm Microwave Users Group' mailto:af@af.afmug.com> >
S

Re: [AFMUG] optical TX power levels

[Zach Underwood]

wow thanks for the detail, I will work with the boss and the fiber provider
to try to address some of those problems.

On Thu, Jan 25, 2024 at 10:14 AM  wrote:

> As an OTDR trace it looks really good, but your problem might be at event
> 18 and/or 19.   I don’t know how much you wanted to know so I apologize if
> I’m starting too far towards the beginning.
>
>
>
> #18 is around 100m from the end and has reflectance of -21.36.  That’s
> crappy.
>
> The -15 below it is even crappier.
>
>
>
> A UPC connector should be -40 to -50 dB
>
> An APC connector should be better than -55 or -60 depending on who you
> believe.
>
>
>
> If the distance is correct then maybe #18 is a cross connect panel?  #19
> should be your Arista.  Start with re-cleaning those connectors.  One-click
> cleaners are fast and cheap.  They only shot this in one direction, so we
> don’t know about the connectors on the other end.  I’d clean it on both
> sides.
>
>
>
> The line graph is showing you attenuation over distance.  You’re averaging
> under 0.2dB per Km so that’s really good.  The table below is showing you
> 19 events.  An event is any point along the graph where attenuation
> suddenly increased.  Events are either “reflective” or “non-reflective”.
> In the first column of the table they’re showing you a /R or /N for
> reflective or non-reflective.  You can also tell that in the line graph
> because reflective events will have a spike before the dip. You don’t want
> reflections.  Reflections are given in a -dB and you want it farther from
> zero (i.e.: -55 reflectance is better than -40 reflectance).
>
>
>
> (And side comment: reflectance is the same thing as return loss, but in
> optics people seem to prefer the term “reflectance”.  The only difference
> is return loss should be indicated with a positive number and reflectance
> is negative.
>
> Return Loss = 10*log(incident power/reflected power) in +dB
>
>Reflectance = 10*log(reflected power/incident power) in -dB
>
> )
>
>
>
> Non-reflective events are things adding attenuation but not adding
> reflectance.  Those would be fusion splices, coils, and bends.
>
>
>
> Reflective events mean there’s an exposed face of glass.  Those would be
> mechanical splices or connectors.  Reflective events could also be a fault
> in the fiber like a bubbled fusion splice.
>
>
>
> All that noise at the end of the line shows where the dead end is.
>
>
>
> On that test result the only event I don’t like along the middle of the
> run is #9.  4dB is a lot for one event.  It might be a less than perfect
> splice, a tight bend in a splice tray, a slack coil that’s too tight, or
> whatever.  It’s not enough to ruin this link, and it’s probably ok if it
> stays at 4dB forever.  There are some underground cases where I’ve seen the
> same high attenuation events for years, but they’re not hurting us and it’s
> too much trouble to access the case to fix something that isn’t currently a
> problem.
>
>
>
> If nobody ever said this before: you should clean connectors every time
> they are handled.  No matter what anybody tells you, the caps they come
> with are not “dust caps” and they won’t keep it clean; the caps are there
> so the glass face doesn’t get scratched.  When I’m plugging things in I
> clean the jack, clean the plug, and then treat it like I’m playing the old
> Operation game:  If the ferrule touches anything before it goes into the
> hole then it’s “Bzt!” and reclean it.
>
>
>
> The dispersion thing is a new concept for me, and I don’t think you could
> diagnose it from this one trace.  From what I’m gathering in this thread, I
> think you’d have to shoot it on multiple wavelengths and compare the
> differences.  This trace is only at 1550nm.
>
>
>
> -Adam
>
>
>
>
>
>
>
> *From:* AF  *On Behalf Of *Zach Underwood
> *Sent:* Wednesday, January 24, 2024 7:41 PM
> *To:* AnimalFarm Microwave Users Group 
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Ok we got the report back from the fiber supplier. This is new to me so
> anyone can offer insight into it?
>
>
>
> PDF
> https://drive.google.com/file/d/1KeIuWHFsiKZHxcmpPiY8PX_-PABl55Sz/view?usp=sharing
>
>
>
>
> On Wed, Jan 24, 2024 at 6:00 PM Daniel Pautz via AF 
> wrote:
>
> Dispersion compensation module - https://www.fs.com/products/65783.html
>
>
>
> *From:* AF  *On Behalf Of *Ken Hohhof
> *Sent:* Wednesday, January 24, 2024 3:53 PM
> *To:* 'AnimalFarm Microwave Users Group' 
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> I spent a few minutes searching on the term DCM and came

Re: [AFMUG] optical TX power levels

[dmmoffett]

As an OTDR trace it looks really good, but your problem might be at event 18 
and/or 19.   I don’t know how much you wanted to know so I apologize if I’m 
starting too far towards the beginning.

 

#18 is around 100m from the end and has reflectance of -21.36.  That’s crappy.  

The -15 below it is even crappier.

 

A UPC connector should be -40 to -50 dB

An APC connector should be better than -55 or -60 depending on who you believe. 

 

If the distance is correct then maybe #18 is a cross connect panel?  #19 should 
be your Arista.  Start with re-cleaning those connectors.  One-click cleaners 
are fast and cheap.  They only shot this in one direction, so we don’t know 
about the connectors on the other end.  I’d clean it on both sides.

 

The line graph is showing you attenuation over distance.  You’re averaging 
under 0.2dB per Km so that’s really good.  The table below is showing you 19 
events.  An event is any point along the graph where attenuation suddenly 
increased.  Events are either “reflective” or “non-reflective”.  In the first 
column of the table they’re showing you a /R or /N for reflective or 
non-reflective.  You can also tell that in the line graph because reflective 
events will have a spike before the dip. You don’t want reflections.  
Reflections are given in a -dB and you want it farther from zero (i.e.: -55 
reflectance is better than -40 reflectance).

 

(And side comment: reflectance is the same thing as return loss, but in optics 
people seem to prefer the term “reflectance”.  The only difference is return 
loss should be indicated with a positive number and reflectance is negative.  

Return Loss = 10*log(incident power/reflected power) in +dB

   Reflectance = 10*log(reflected power/incident power) in -dB

)

 

Non-reflective events are things adding attenuation but not adding reflectance. 
 Those would be fusion splices, coils, and bends.  

 

Reflective events mean there’s an exposed face of glass.  Those would be 
mechanical splices or connectors.  Reflective events could also be a fault in 
the fiber like a bubbled fusion splice.  

 

All that noise at the end of the line shows where the dead end is.

 

On that test result the only event I don’t like along the middle of the run is 
#9.  4dB is a lot for one event.  It might be a less than perfect splice, a 
tight bend in a splice tray, a slack coil that’s too tight, or whatever.  It’s 
not enough to ruin this link, and it’s probably ok if it stays at 4dB forever.  
There are some underground cases where I’ve seen the same high attenuation 
events for years, but they’re not hurting us and it’s too much trouble to 
access the case to fix something that isn’t currently a problem.

 

If nobody ever said this before: you should clean connectors every time they 
are handled.  No matter what anybody tells you, the caps they come with are not 
“dust caps” and they won’t keep it clean; the caps are there so the glass face 
doesn’t get scratched.  When I’m plugging things in I clean the jack, clean the 
plug, and then treat it like I’m playing the old Operation game:  If the 
ferrule touches anything before it goes into the hole then it’s “Bzt!” and 
reclean it.

 

The dispersion thing is a new concept for me, and I don’t think you could 
diagnose it from this one trace.  From what I’m gathering in this thread, I 
think you’d have to shoot it on multiple wavelengths and compare the 
differences.  This trace is only at 1550nm.  

 

-Adam

 

 

 

From: AF  On Behalf Of Zach Underwood
Sent: Wednesday, January 24, 2024 7:41 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] optical TX power levels

 

Ok we got the report back from the fiber supplier. This is new to me so anyone 
can offer insight into it?

 

PDF 
https://drive.google.com/file/d/1KeIuWHFsiKZHxcmpPiY8PX_-PABl55Sz/view?usp=sharing
 

 

On Wed, Jan 24, 2024 at 6:00 PM Daniel Pautz via AF mailto:af@af.afmug.com> > wrote:

Dispersion compensation module - https://www.fs.com/products/65783.html

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Ken Hohhof
Sent: Wednesday, January 24, 2024 3:53 PM
To: 'AnimalFarm Microwave Users Group' mailto:af@af.afmug.com> >
Subject: Re: [AFMUG] optical TX power levels

 

I spent a few minutes searching on the term DCM and came up with “chirped fiber 
Bragg grating”.

https://en.wikipedia.org/wiki/Fiber_Bragg_grating

 

OK, I’m out of my depth now.

 

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Daniel Pautz via AF
Sent: Wednesday, January 24, 2024 4:40 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com> >
Cc: Daniel Pautz mailto:d...@webnx.com> >
Subject: Re: [AFMUG] optical TX power levels

 

Perhaps pick up a used cheap DCM and see if it helps,  adjustable  preferred if 
not as close to the fiber distance.   Our newest 100G dwdm build (dozen 100G 
optics) very much needed a DCM on it.   

 

Fro

Re: [AFMUG] optical TX power levels

[Ken Hohhof]

Consider my socks blown off.Do you need 2 of them, one for each strand? Does it 
go at the xmt end, or the rcv end, or doesn't matter? I'm assuming you don't 
need 4 total. Original Message From: "Daniel Pautz via AF" Sent: 
1/24/2024 5:00:29 PMTo: "AnimalFarm Microwave Users Group" Cc: "Daniel Pautz" 
Subject: Re: [AFMUG] optical TX power levels







Dispersion compensation module -
https://www.fs.com/products/65783.html
?


From: AF 
On Behalf Of Ken Hohhof
Sent: Wednesday, January 24, 2024 3:53 PM
To: 'AnimalFarm Microwave Users Group' 
Subject: Re: [AFMUG] optical TX power levels


?
I spent a few minutes searching on the term DCM and came up with ?chirped fiber 
Bragg grating?.
https://en.wikipedia.org/wiki/Fiber_Bragg_grating
?
OK, I?m out of my depth now.
?
?


From: AF 
On Behalf Of Daniel Pautz via AF
Sent: Wednesday, January 24, 2024 4:40 PM
To: AnimalFarm Microwave Users Group 
Cc: Daniel Pautz 
Subject: Re: [AFMUG] optical TX power levels


?
Perhaps pick up a used cheap DCM and see if it helps,? adjustable? preferred if 
not as close to the fiber distance.?? Our newest 100G dwdm build (dozen 100G 
optics) very much
 needed a DCM on it.?? 
?


From: AF 
On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:36 PM
To: 'AnimalFarm Microwave Users Group' 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels


?



Gotta think of the Fourier series of the pulse.? Yes group velocities or group 
delay of the whole enchalada.? It is all kinda the same thing.? They were doing 
some kind of soliton
 fiber development.? Haven?t heard much for some time about that.? No idea how 
frequency pure/coherent the tx is.? I imagine phase coherency is a big deal.



?


?




?



From: Ken Hohhof



Sent: Wednesday, January 24, 2024 4:12 PM


To: 'AnimalFarm Microwave Users Group'



Subject: Re: [AFMUG] optical TX power levels




?



Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).
?
Is this because the transmitter doesn?t generate literally a single 
wavelength?? Or is this a WDM issue?? Chuck says the pulses get smeared out in 
time, that sounds like the first one.
?


From: AF 
On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels


?



Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.? Similar to trying to use too high level of QAM with SNR issues.?



?



From: Josh Luthman





Sent: Wednesday, January 24, 2024 12:26 PM


To: AnimalFarm Microwave Users Group



Subject: Re: [AFMUG] optical TX power levels




?




Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides


?



On Wed, Jan 24, 2024 at 1:22?PM Daniel Pautz via AF  wrote:





Yeah makes me think the two paths have different loss.?? We have had that on 
mirrored paths,? or even single paths with
 crappy splices on one of the strands.? 
?


From: AF 
On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels


?



Did anyone do dispersion testing on the fiber?


?


Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell 
www.mccowntech.com
www.microtrench-blades.com
www.terabitnetworks.com




?




From: Zach Underwood




Sent: Wednesday, January 24, 2024 12:07 PM



To: AnimalFarm Microwave Users Group




Subject: Re: [AFMUG] optical TX power levels




?




tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link
 up. This will do for now. We will be looking at getting 40gb 80km single lane 
optics or adding another site to fiber loop to shorten the footage to under 
40km.



?



On Wed, Jan 24, 2024 at 11:14?AM Colin Stanners  wrote:




So both of those SFPs are within the tx power range.



?


100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a
 box style at one end. 

?


You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

?


On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:





TX Power??
2~6.5dBm


?


I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels
 are -22 and -20 on both sides but I can't get it to link. I take the same 
optics to the lab and add 20dbm of
attenuator to get almost the same rx levels as the field and it will link up.


I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For m

Re: [AFMUG] optical TX power levels

[Zach Underwood]

Ok we got the report back from the fiber supplier. This is new to me so
anyone can offer insight into it?

PDF
https://drive.google.com/file/d/1KeIuWHFsiKZHxcmpPiY8PX_-PABl55Sz/view?usp=sharing


On Wed, Jan 24, 2024 at 6:00 PM Daniel Pautz via AF  wrote:

> Dispersion compensation module - https://www.fs.com/products/65783.html
>
>
>
> *From:* AF  *On Behalf Of *Ken Hohhof
> *Sent:* Wednesday, January 24, 2024 3:53 PM
> *To:* 'AnimalFarm Microwave Users Group' 
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> I spent a few minutes searching on the term DCM and came up with “chirped
> fiber Bragg grating”.
>
> https://en.wikipedia.org/wiki/Fiber_Bragg_grating
>
>
>
> OK, I’m out of my depth now.
>
>
>
>
>
> *From:* AF  *On Behalf Of *Daniel Pautz via AF
> *Sent:* Wednesday, January 24, 2024 4:40 PM
> *To:* AnimalFarm Microwave Users Group 
> *Cc:* Daniel Pautz 
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Perhaps pick up a used cheap DCM and see if it helps,  adjustable
> preferred if not as close to the fiber distance.   Our newest 100G dwdm
> build (dozen 100G optics) very much needed a DCM on it.
>
>
>
> *From:* AF  *On Behalf Of *Chuck McCown via AF
> *Sent:* Wednesday, January 24, 2024 3:36 PM
> *To:* 'AnimalFarm Microwave Users Group' 
> *Cc:* ch...@go-mtc.com
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Gotta think of the Fourier series of the pulse.  Yes group velocities or
> group delay of the whole enchalada.  It is all kinda the same thing.  They
> were doing some kind of soliton fiber development.  Haven’t heard much for
> some time about that.  No idea how frequency pure/coherent the tx is.  I
> imagine phase coherency is a big deal.
>
>
>
>
>
>
>
> *From:* Ken Hohhof
>
> *Sent:* Wednesday, January 24, 2024 4:12 PM
>
> *To:* 'AnimalFarm Microwave Users Group'
>
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Looks like different wavelengths have different group velocities, so
> compensation is possible (but probably not cheap?).
>
>
>
> Is this because the transmitter doesn’t generate literally a single
> wavelength?  Or is this a WDM issue?  Chuck says the pulses get smeared out
> in time, that sounds like the first one.
>
>
>
> *From:* AF  *On Behalf Of *Chuck McCown via AF
> *Sent:* Wednesday, January 24, 2024 3:56 PM
> *To:* AnimalFarm Microwave Users Group 
> *Cc:* ch...@go-mtc.com
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Yeah, the pulses tend to get smeared out in time if there is too much
> dispersion.  Similar to trying to use too high level of QAM with SNR
> issues.
>
>
>
> *From:* Josh Luthman
>
> *Sent:* Wednesday, January 24, 2024 12:26 PM
>
> *To:* AnimalFarm Microwave Users Group
>
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Even if the RX level is good?
>
> > rx was within 0.3dBm on all 4 lanes on both sides
>
>
>
> On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF 
> wrote:
>
> Yeah makes me think the two paths have different loss.   We have had that
> on mirrored paths,  or even single paths with crappy splices on one of the
> strands.
>
>
>
> *From:* AF  *On Behalf Of *Chuck McCown via AF
> *Sent:* Wednesday, January 24, 2024 11:12 AM
> *To:* AnimalFarm Microwave Users Group 
> *Cc:* ch...@go-mtc.com
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Did anyone do dispersion testing on the fiber?
>
>
>
> Chuck McCown
> McCown Technology Corporation
> 8401 N Commerce Dr
> Lake Point, Utah 84074
> 801-250-9503
> 435-830-4306 cell
> www.mccowntech.com
> www.microtrench-blades.com
> www.terabitnetworks.com
>
>
>
> *From:* Zach Underwood
>
> *Sent:* Wednesday, January 24, 2024 12:07 PM
>
> *To:* AnimalFarm Microwave Users Group
>
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> tired again this morning and still no link. rx was within 0.3dBm on all 4
> lanes on both sides. We got 10gb 80km to link up. This will do for now. We
> will be looking at getting 40gb 80km single lane optics or adding another
> site to fiber loop to shorten the footage to under 40km.
>
>
>
> On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
> wrote:
>
> So both of those SFPs are within the tx power range.
>
>
>
> 100G may not work on a link that long unless you have dispersion
> compensation fiber on the path or in a huge loop in a box style at one end.
>
>
>
> You likely cannot change tx power levels on those SFPs, they will run at
> the max they can do for that specific unit.
>
>
>
> On Wed, Ja

Re: [AFMUG] optical TX power levels

[Mike Hammett]

Isn't 100G tolerant of dispersion, or is not all 100G coherent? 




- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 




- Original Message -

From: "Colin Stanners"  
To: "AnimalFarm Microwave Users Group"  
Sent: Wednesday, January 24, 2024 10:13:25 AM 
Subject: Re: [AFMUG] optical TX power levels 



So both of those SFPs are within the tx power range. 


100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end. 


You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit. 



On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood < zunder1...@gmail.com > wrote: 





TX Power 2~6.5dBm 



I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km. 

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R 

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf 
https://www.fs.com/products/115818.html?attribute=29032=3462585 



On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners < cstann...@gmail.com > wrote: 



There should be. What does their datasheey indicate for tx power range? 


On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood < zunder1...@gmail.com > wrote: 



Yep labels identical but there is a difference in default power levels. 


On Wed, Jan 24, 2024, 8:13 AM Mike Hammett < af...@ics-il.net > wrote: 




Oh, meaning the variance between the two, otherwise identical models? 




- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 






From: "Zach Underwood" < zunder1...@gmail.com > 
To: "AnimalFarm Microwave Users Group" < af@af.afmug.com > 
Sent: Tuesday, January 23, 2024 12:51:39 PM 
Subject: [AFMUG] optical TX power levels 


I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same. 


Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each 



-- 






Zach Underwood (RHCE,RHCSA,RHCT, UACA ) 


My website 

advance-networking.com 

-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 

-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 


-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 


-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 





-- 






Zach Underwood (RHCE,RHCSA,RHCT, UACA ) 


My website 

advance-networking.com 
-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 



-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Adam Moffett]

I wonder if it would work as 4x 25gig links.  Should be able to configure it 
that way.

Get Outlook for iOS<https://aka.ms/o0ukef>

From: AF  on behalf of Chuck McCown via AF 

Sent: Wednesday, January 24, 2024 5:36:06 PM
To: 'AnimalFarm Microwave Users Group' 
Cc: ch...@go-mtc.com 
Subject: Re: [AFMUG] optical TX power levels

Gotta think of the Fourier series of the pulse.  Yes group velocities or group 
delay of the whole enchalada.  It is all kinda the same thing.  They were doing 
some kind of soliton fiber development.  Haven’t heard much for some time about 
that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal.



From: Ken Hohhof
Sent: Wednesday, January 24, 2024 4:12 PM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] optical TX power levels


Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).



Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.



From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels



Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.



From: Josh Luthman

Sent: Wednesday, January 24, 2024 12:26 PM

To: AnimalFarm Microwave Users Group

Subject: Re: [AFMUG] optical TX power levels



Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides



On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF  wrote:

Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the strands.



From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels



Did anyone do dispersion testing on the fiber?



Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell
www.mccowntech.com<http://www.mccowntech.com>
www.microtrench-blades.com<http://www.microtrench-blades.com>
www.terabitnetworks.com<http://www.terabitnetworks.com>



From: Zach Underwood

Sent: Wednesday, January 24, 2024 12:07 PM

To: AnimalFarm Microwave Users Group

Subject: Re: [AFMUG] optical TX power levels



tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km.



On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners  wrote:

So both of those SFPs are within the tx power range.



100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end.



You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.



On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:

TX Power   2~6.5dBm



I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up.

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km.

switch is Arista DCS-7060SX2-48YC6-R



https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032=3462585



On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners  wrote:

There should be. What does their datasheey indicate for tx power range?



On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood  wrote:

Yep labels identical but there is a difference in default power levels.



On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

Oh, meaning the variance between the two, otherwise identical models?


-
Mike Hammett
Intelligent Computing Solutions<http://www.ics-il.com/>

Midwest Internet Exchange

The Brothers WISP



<https://www.facebook.com/ICSIL>



From: "Zach Underwood" 
To: "AnimalFarm Microwave Users Group" 
Sent: Tuesday, January 23, 2024 12:51:39 PM
Subject: [AFMUG] optical TX power levels

I got 2x 100gb 80km optics from FS that run diff

Re: [AFMUG] optical TX power levels

[Daniel Pautz via AF]

Dispersion compensation module - https://www.fs.com/products/65783.html

From: AF  On Behalf Of Ken Hohhof
Sent: Wednesday, January 24, 2024 3:53 PM
To: 'AnimalFarm Microwave Users Group' 
Subject: Re: [AFMUG] optical TX power levels

I spent a few minutes searching on the term DCM and came up with “chirped fiber 
Bragg grating”.
https://en.wikipedia.org/wiki/Fiber_Bragg_grating

OK, I’m out of my depth now.


From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Daniel Pautz via AF
Sent: Wednesday, January 24, 2024 4:40 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Cc: Daniel Pautz mailto:d...@webnx.com>>
Subject: Re: [AFMUG] optical TX power levels

Perhaps pick up a used cheap DCM and see if it helps,  adjustable  preferred if 
not as close to the fiber distance.   Our newest 100G dwdm build (dozen 100G 
optics) very much needed a DCM on it.

From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:36 PM
To: 'AnimalFarm Microwave Users Group' mailto:af@af.afmug.com>>
Cc: ch...@go-mtc.com<mailto:ch...@go-mtc.com>
Subject: Re: [AFMUG] optical TX power levels

Gotta think of the Fourier series of the pulse.  Yes group velocities or group 
delay of the whole enchalada.  It is all kinda the same thing.  They were doing 
some kind of soliton fiber development.  Haven’t heard much for some time about 
that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal.



From: Ken Hohhof
Sent: Wednesday, January 24, 2024 4:12 PM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] optical TX power levels

Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).

Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.

From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Cc: ch...@go-mtc.com<mailto:ch...@go-mtc.com>
Subject: Re: [AFMUG] optical TX power levels

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.

From: Josh Luthman
Sent: Wednesday, January 24, 2024 12:26 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] optical TX power levels

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF 
mailto:af@af.afmug.com>> wrote:
Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the strands.

From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Cc: ch...@go-mtc.com<mailto:ch...@go-mtc.com>
Subject: Re: [AFMUG] optical TX power levels

Did anyone do dispersion testing on the fiber?

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell
www.mccowntech.com<http://www.mccowntech.com>
www.microtrench-blades.com<http://www.microtrench-blades.com>
www.terabitnetworks.com<http://www.terabitnetworks.com>

From: Zach Underwood
Sent: Wednesday, January 24, 2024 12:07 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] optical TX power levels

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km.

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
mailto:cstann...@gmail.com>> wrote:
So both of those SFPs are within the tx power range.

100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end.

You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
mailto:zunder1...@gmail.com>> wrote:

TX Power   2~6.5dBm

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up.

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they don

Re: [AFMUG] optical TX power levels

[Ken Hohhof]

I spent a few minutes searching on the term DCM and came up with “chirped fiber 
Bragg grating”.

https://en.wikipedia.org/wiki/Fiber_Bragg_grating

 

OK, I’m out of my depth now.

 

 

From: AF  On Behalf Of Daniel Pautz via AF
Sent: Wednesday, January 24, 2024 4:40 PM
To: AnimalFarm Microwave Users Group 
Cc: Daniel Pautz 
Subject: Re: [AFMUG] optical TX power levels

 

Perhaps pick up a used cheap DCM and see if it helps,  adjustable  preferred if 
not as close to the fiber distance.   Our newest 100G dwdm build (dozen 100G 
optics) very much needed a DCM on it.   

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:36 PM
To: 'AnimalFarm Microwave Users Group' mailto:af@af.afmug.com> >
Cc: ch...@go-mtc.com <mailto:ch...@go-mtc.com> 
Subject: Re: [AFMUG] optical TX power levels

 

Gotta think of the Fourier series of the pulse.  Yes group velocities or group 
delay of the whole enchalada.  It is all kinda the same thing.  They were doing 
some kind of soliton fiber development.  Haven’t heard much for some time about 
that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal. 

 

 

 

From: Ken Hohhof 

Sent: Wednesday, January 24, 2024 4:12 PM

To: 'AnimalFarm Microwave Users Group' 

Subject: Re: [AFMUG] optical TX power levels

 

Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).

 

Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com> >
Cc: ch...@go-mtc.com <mailto:ch...@go-mtc.com> 
Subject: Re: [AFMUG] optical TX power levels

 

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.  

 

From: Josh Luthman 

Sent: Wednesday, January 24, 2024 12:26 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels

 

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

 

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF mailto:af@af.afmug.com> > wrote:

Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the 
strands.  

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com> >
Cc: ch...@go-mtc.com <mailto:ch...@go-mtc.com> 
Subject: Re: [AFMUG] optical TX power levels

 

Did anyone do dispersion testing on the fiber?

 

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell 
www.mccowntech.com <http://www.mccowntech.com> 
www.microtrench-blades.com <http://www.microtrench-blades.com> 
www.terabitnetworks.com <http://www.terabitnetworks.com> 

 

From: Zach Underwood 

Sent: Wednesday, January 24, 2024 12:07 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels

 

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km. 

 

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners mailto:cstann...@gmail.com> > wrote:

So both of those SFPs are within the tx power range. 

 

100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end. 

 

You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

 

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood mailto:zunder1...@gmail.com> > wrote:


TX Power   2~6.5dBm

 

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R

 

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf

Re: [AFMUG] optical TX power levels

[Daniel Pautz via AF]

Perhaps pick up a used cheap DCM and see if it helps,  adjustable  preferred if 
not as close to the fiber distance.   Our newest 100G dwdm build (dozen 100G 
optics) very much needed a DCM on it.

From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:36 PM
To: 'AnimalFarm Microwave Users Group' 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

Gotta think of the Fourier series of the pulse.  Yes group velocities or group 
delay of the whole enchalada.  It is all kinda the same thing.  They were doing 
some kind of soliton fiber development.  Haven’t heard much for some time about 
that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal.



From: Ken Hohhof
Sent: Wednesday, January 24, 2024 4:12 PM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] optical TX power levels

Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).

Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.

From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Cc: ch...@go-mtc.com<mailto:ch...@go-mtc.com>
Subject: Re: [AFMUG] optical TX power levels

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.

From: Josh Luthman
Sent: Wednesday, January 24, 2024 12:26 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] optical TX power levels

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF 
mailto:af@af.afmug.com>> wrote:
Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the strands.

From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Cc: ch...@go-mtc.com<mailto:ch...@go-mtc.com>
Subject: Re: [AFMUG] optical TX power levels

Did anyone do dispersion testing on the fiber?

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell
www.mccowntech.com<http://www.mccowntech.com>
www.microtrench-blades.com<http://www.microtrench-blades.com>
www.terabitnetworks.com<http://www.terabitnetworks.com>

From: Zach Underwood
Sent: Wednesday, January 24, 2024 12:07 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] optical TX power levels

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km.

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
mailto:cstann...@gmail.com>> wrote:
So both of those SFPs are within the tx power range.

100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end.

You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
mailto:zunder1...@gmail.com>> wrote:

TX Power   2~6.5dBm

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up.

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km.

switch is Arista DCS-7060SX2-48YC6-R

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032=3462585

On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
mailto:cstann...@gmail.com>> wrote:
There should be. What does their datasheey indicate for tx power range?

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
mailto:zunder1...@gmail.com>> wrote:
Yep labels identical but there is a difference in default power levels.

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett 
mailto:af...@ics-il.net>> wrote:
Oh, meaning the variance between the two, otherwise identical models?


-
Mike Hammett
Intelligent Computi

Re: [AFMUG] optical TX power levels

[Chuck McCown via AF]

Gotta think of the Fourier series of the pulse.  Yes group velocities or group 
delay of the whole enchalada.  It is all kinda the same thing.  They were doing 
some kind of soliton fiber development.  Haven’t heard much for some time about 
that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal. 



From: Ken Hohhof 
Sent: Wednesday, January 24, 2024 4:12 PM
To: 'AnimalFarm Microwave Users Group' 
Subject: Re: [AFMUG] optical TX power levels

Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).

 

Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.

 

From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

 

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.  

 

From: Josh Luthman 

Sent: Wednesday, January 24, 2024 12:26 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels

 

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

 

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF  wrote:

  Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the 
strands.  

   

  From: AF  On Behalf Of Chuck McCown via AF
  Sent: Wednesday, January 24, 2024 11:12 AM
  To: AnimalFarm Microwave Users Group 
  Cc: ch...@go-mtc.com
  Subject: Re: [AFMUG] optical TX power levels

   

  Did anyone do dispersion testing on the fiber?

   

  Chuck McCown
  McCown Technology Corporation
  8401 N Commerce Dr
  Lake Point, Utah 84074
  801-250-9503
  435-830-4306 cell 
  www.mccowntech.com
  www.microtrench-blades.com
  www.terabitnetworks.com

   

  From: Zach Underwood 

  Sent: Wednesday, January 24, 2024 12:07 PM

  To: AnimalFarm Microwave Users Group 

  Subject: Re: [AFMUG] optical TX power levels

   

  tired again this morning and still no link. rx was within 0.3dBm on all 4 
lanes on both sides. We got 10gb 80km to link up. This will do for now. We will 
be looking at getting 40gb 80km single lane optics or adding another site to 
fiber loop to shorten the footage to under 40km. 

   

  On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners  wrote:

So both of those SFPs are within the tx power range. 

 

100G may not work on a link that long unless you have dispersion 
compensation fiber on the path or in a huge loop in a box style at one end. 

 

You likely cannot change tx power levels on those SFPs, they will run at 
the max they can do for that specific unit.

 

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:


  TX Power   2~6.5dBm

   

  I am struggling to get this 100gb link up. In the field this link is 
quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't get 
it to link. I take the same optics to the lab and add 20dbm of attenuator to 
get almost the same rx levels as the field and it will link up. 

  I have added error-correction encoding reed-solomon per the user guide 
for links over 40km.

  So far I have not found a way to change the TX levels in arista, the 
options are in the CLI but they dont seem to change the outcome. For me this is 
the first time dealing with 80km optics or 100gb optics over 10km. 

  switch is Arista DCS-7060SX2-48YC6-R

   

  https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
  https://www.fs.com/products/115818.html?attribute=29032=3462585

   

  On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners  
wrote:

There should be. What does their datasheey indicate for tx power range?

 

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood  
wrote:

  Yep labels identical but there is a difference in default power 
levels.

   

  On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

Oh, meaning the variance between the two, otherwise identical 
models?



-
Mike Hammett
Intelligent Computing Solutions

Midwest Internet Exchange

The Brothers WISP








From: "Zach Underwood" 
To: "AnimalFarm Microwave Users Group" 
Sent: Tuesday, January 23, 2024 12:51:39 PM
    Subject: [AFMUG] optical TX power levels

I got 2x 100gb 80km optics from FS that run difficult default TX 
power levels one is 3.81dBm and the other 2.63dBm, the config on the arista 
devices hosting

Re: [AFMUG] optical TX power levels

[Ken Hohhof]

Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).

 

Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.

 

From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

 

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.  

 

From: Josh Luthman 

Sent: Wednesday, January 24, 2024 12:26 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels

 

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

 

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF mailto:af@af.afmug.com> > wrote:

Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the 
strands.  

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com> >
Cc: ch...@go-mtc.com <mailto:ch...@go-mtc.com> 
Subject: Re: [AFMUG] optical TX power levels

 

Did anyone do dispersion testing on the fiber?

 

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell 
www.mccowntech.com <http://www.mccowntech.com> 
www.microtrench-blades.com <http://www.microtrench-blades.com> 
www.terabitnetworks.com <http://www.terabitnetworks.com> 

 

From: Zach Underwood 

Sent: Wednesday, January 24, 2024 12:07 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels

 

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km. 

 

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners mailto:cstann...@gmail.com> > wrote:

So both of those SFPs are within the tx power range. 

 

100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end. 

 

You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

 

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood mailto:zunder1...@gmail.com> > wrote:


TX Power   2~6.5dBm

 

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R

 

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032 
<https://www.fs.com/products/115818.html?attribute=29032=3462585> =3462585

 

On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners mailto:cstann...@gmail.com> > wrote:

There should be. What does their datasheey indicate for tx power range?

 

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood mailto:zunder1...@gmail.com> > wrote:

Yep labels identical but there is a difference in default power levels.

 

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett mailto:af...@ics-il.net> > wrote:

Oh, meaning the variance between the two, otherwise identical models?



-
Mike Hammett
 <http://www.ics-il.com/> Intelligent Computing Solutions
 <https://www.facebook.com/ICSIL> 
Midwest Internet Exchange

The Brothers WISP






  _  


From: "Zach Underwood" 
To: "AnimalFarm Microwave Users Group" 
Sent: Tuesday, January 23, 2024 12:51:39 PM
Subject: [AFMUG] optical TX power levels

I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same. 

 

Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each

 

-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA) 

My website

advance-networking.com


-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

 

-- 
AF maili

Re: [AFMUG] optical TX power levels

[Chuck McCown via AF]

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.  

From: Josh Luthman 
Sent: Wednesday, January 24, 2024 12:26 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] optical TX power levels

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF  wrote:

  Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the 
strands.  



  From: AF  On Behalf Of Chuck McCown via AF
  Sent: Wednesday, January 24, 2024 11:12 AM
  To: AnimalFarm Microwave Users Group 
  Cc: ch...@go-mtc.com
  Subject: Re: [AFMUG] optical TX power levels



  Did anyone do dispersion testing on the fiber?



  Chuck McCown
  McCown Technology Corporation
  8401 N Commerce Dr
  Lake Point, Utah 84074
  801-250-9503
  435-830-4306 cell 
  www.mccowntech.com
  www.microtrench-blades.com
  www.terabitnetworks.com



  From: Zach Underwood 

  Sent: Wednesday, January 24, 2024 12:07 PM

  To: AnimalFarm Microwave Users Group 

  Subject: Re: [AFMUG] optical TX power levels



  tired again this morning and still no link. rx was within 0.3dBm on all 4 
lanes on both sides. We got 10gb 80km to link up. This will do for now. We will 
be looking at getting 40gb 80km single lane optics or adding another site to 
fiber loop to shorten the footage to under 40km. 



  On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners  wrote:

So both of those SFPs are within the tx power range. 



100G may not work on a link that long unless you have dispersion 
compensation fiber on the path or in a huge loop in a box style at one end. 



You likely cannot change tx power levels on those SFPs, they will run at 
the max they can do for that specific unit.



On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:


  TX Power   2~6.5dBm



  I am struggling to get this 100gb link up. In the field this link is 
quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't get 
it to link. I take the same optics to the lab and add 20dbm of attenuator to 
get almost the same rx levels as the field and it will link up. 

  I have added error-correction encoding reed-solomon per the user guide 
for links over 40km.

  So far I have not found a way to change the TX levels in arista, the 
options are in the CLI but they dont seem to change the outcome. For me this is 
the first time dealing with 80km optics or 100gb optics over 10km. 

  switch is Arista DCS-7060SX2-48YC6-R



  https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
  https://www.fs.com/products/115818.html?attribute=29032=3462585



  On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners  
wrote:

There should be. What does their datasheey indicate for tx power range?



On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood  
wrote:

  Yep labels identical but there is a difference in default power 
levels.



  On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

Oh, meaning the variance between the two, otherwise identical 
models?



-
Mike Hammett
Intelligent Computing Solutions

Midwest Internet Exchange

The Brothers WISP








From: "Zach Underwood" 
To: "AnimalFarm Microwave Users Group" 
Sent: Tuesday, January 23, 2024 12:51:39 PM
    Subject: [AFMUG] optical TX power levels

I got 2x 100gb 80km optics from FS that run difficult default TX 
power levels one is 3.81dBm and the other 2.63dBm, the config on the arista 
devices hosting the optics is the same. 



Has anyone seen much difference between optic like this? My sample 
size is small due to the optices costing $4k each



-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA) 

My website

advance-networking.com


-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com



-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

  -- 
  AF mailing list
  AF@af.afmug.com
  http://af.afmug.com/mailman/listinfo/af_af.afmug.com

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com





  -- 

  Zach Underwood (RHCE,RHCSA,RHCT,UACA) 

  My website

  advance-networking.com

  -- 
  AF mailing list
  AF@af.afmug.com
  http://af.afmug.com/mailman/listinfo/af_af.afmug.com

-- 
AF mailing list
AF@af.afmug.com
http://af.afm

Re: [AFMUG] optical TX power levels

[Colin Stanners]

I doubt that rx level is the problem here. Dispersion becomes a bigger
problem once you go past 10G speeds, on those long links.

On Wed, Jan 24, 2024, 12:27 p.m. Josh Luthman 
wrote:

> Even if the RX level is good?
>
> > rx was within 0.3dBm on all 4 lanes on both sides
>
> On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF 
> wrote:
>
>> Yeah makes me think the two paths have different loss.   We have had that
>> on mirrored paths,  or even single paths with crappy splices on one of the
>> strands.
>>
>>
>>
>> *From:* AF  *On Behalf Of * Chuck McCown via AF
>> *Sent:* Wednesday, January 24, 2024 11:12 AM
>> *To:* AnimalFarm Microwave Users Group 
>> *Cc:* ch...@go-mtc.com
>> *Subject:* Re: [AFMUG] optical TX power levels
>>
>>
>>
>> Did anyone do dispersion testing on the fiber?
>>
>>
>>
>> Chuck McCown
>> McCown Technology Corporation
>> 8401 N Commerce Dr
>> Lake Point, Utah 84074
>> 801-250-9503
>> 435-830-4306 cell
>> www.mccowntech.com
>> www.microtrench-blades.com
>> www.terabitnetworks.com
>>
>>
>>
>> *From:* Zach Underwood
>>
>> *Sent:* Wednesday, January 24, 2024 12:07 PM
>>
>> *To:* AnimalFarm Microwave Users Group
>>
>> *Subject:* Re: [AFMUG] optical TX power levels
>>
>>
>>
>> tired again this morning and still no link. rx was within 0.3dBm on all 4
>> lanes on both sides. We got 10gb 80km to link up. This will do for now. We
>> will be looking at getting 40gb 80km single lane optics or adding another
>> site to fiber loop to shorten the footage to under 40km.
>>
>>
>>
>> On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
>> wrote:
>>
>> So both of those SFPs are within the tx power range.
>>
>>
>>
>> 100G may not work on a link that long unless you have dispersion
>> compensation fiber on the path or in a huge loop in a box style at one end.
>>
>>
>>
>> You likely cannot change tx power levels on those SFPs, they will run at
>> the max they can do for that specific unit.
>>
>>
>>
>> On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
>> wrote:
>>
>>
>> *TX Power*   2~6.5dBm
>>
>>
>>
>> I am struggling to get this 100gb link up. In the field this link is
>> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't
>> get it to link. I take the same optics to the lab and add 20dbm of attenuator
>> to get almost the same rx levels as the field and it will link up.
>>
>> I have added error-correction encoding reed-solomon per the user guide
>> for links over 40km.
>>
>> So far I have not found a way to change the TX levels in arista, the
>> options are in the CLI but they dont seem to change the outcome. For me
>> this is the first time dealing with 80km optics or 100gb optics over 10km.
>>
>> switch is Arista DCS-7060SX2-48YC6-R
>>
>>
>>
>> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
>> https://www.fs.com/products/115818.html?attribute=29032=3462585
>>
>>
>>
>> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
>> wrote:
>>
>> There should be. What does their datasheey indicate for tx power range?
>>
>>
>>
>> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
>> wrote:
>>
>> Yep labels identical but there is a difference in default power levels.
>>
>>
>>
>> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>>
>> Oh, meaning the variance between the two, otherwise identical models?
>>
>>
>>
>> -
>> Mike Hammett
>> Intelligent Computing Solutions <http://www.ics-il.com/>
>> <https://www.facebook.com/ICSIL>
>> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>
>> <https://www.linkedin.com/company/intelligent-computing-solutions>
>> <https://twitter.com/ICSIL>
>> Midwest Internet Exchange <http://www.midwest-ix.com/>
>> <https://www.facebook.com/mdwestix>
>> <https://www.linkedin.com/company/midwest-internet-exchange>
>> <https://twitter.com/mdwestix>
>> The Brothers WISP <http://www.thebrotherswisp.com/>
>> <https://www.facebook.com/thebrotherswisp>
>>
>>
>> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
>> --
>>
>> *From: *"Zach Underwood" 
>> *To: *"AnimalFarm Microwave Users Group" 
>> *Sent: *Tuesday, Januar

Re: [AFMUG] optical TX power levels

[Josh Luthman]

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF  wrote:

> Yeah makes me think the two paths have different loss.   We have had that
> on mirrored paths,  or even single paths with crappy splices on one of the
> strands.
>
>
>
> *From:* AF  *On Behalf Of * Chuck McCown via AF
> *Sent:* Wednesday, January 24, 2024 11:12 AM
> *To:* AnimalFarm Microwave Users Group 
> *Cc:* ch...@go-mtc.com
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Did anyone do dispersion testing on the fiber?
>
>
>
> Chuck McCown
> McCown Technology Corporation
> 8401 N Commerce Dr
> Lake Point, Utah 84074
> 801-250-9503
> 435-830-4306 cell
> www.mccowntech.com
> www.microtrench-blades.com
> www.terabitnetworks.com
>
>
>
> *From:* Zach Underwood
>
> *Sent:* Wednesday, January 24, 2024 12:07 PM
>
> *To:* AnimalFarm Microwave Users Group
>
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> tired again this morning and still no link. rx was within 0.3dBm on all 4
> lanes on both sides. We got 10gb 80km to link up. This will do for now. We
> will be looking at getting 40gb 80km single lane optics or adding another
> site to fiber loop to shorten the footage to under 40km.
>
>
>
> On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
> wrote:
>
> So both of those SFPs are within the tx power range.
>
>
>
> 100G may not work on a link that long unless you have dispersion
> compensation fiber on the path or in a huge loop in a box style at one end.
>
>
>
> You likely cannot change tx power levels on those SFPs, they will run at
> the max they can do for that specific unit.
>
>
>
> On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
> wrote:
>
>
> *TX Power*   2~6.5dBm
>
>
>
> I am struggling to get this 100gb link up. In the field this link is
> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't
> get it to link. I take the same optics to the lab and add 20dbm of attenuator
> to get almost the same rx levels as the field and it will link up.
>
> I have added error-correction encoding reed-solomon per the user guide for
> links over 40km.
>
> So far I have not found a way to change the TX levels in arista, the
> options are in the CLI but they dont seem to change the outcome. For me
> this is the first time dealing with 80km optics or 100gb optics over 10km.
>
> switch is Arista DCS-7060SX2-48YC6-R
>
>
>
> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
> https://www.fs.com/products/115818.html?attribute=29032=3462585
>
>
>
> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
> wrote:
>
> There should be. What does their datasheey indicate for tx power range?
>
>
>
> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
> wrote:
>
> Yep labels identical but there is a difference in default power levels.
>
>
>
> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>
> Oh, meaning the variance between the two, otherwise identical models?
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions <http://www.ics-il.com/>
> <https://www.facebook.com/ICSIL>
> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>
> <https://www.linkedin.com/company/intelligent-computing-solutions>
> <https://twitter.com/ICSIL>
> Midwest Internet Exchange <http://www.midwest-ix.com/>
> <https://www.facebook.com/mdwestix>
> <https://www.linkedin.com/company/midwest-internet-exchange>
> <https://twitter.com/mdwestix>
> The Brothers WISP <http://www.thebrotherswisp.com/>
> <https://www.facebook.com/thebrotherswisp>
>
>
> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
> --
>
> *From: *"Zach Underwood" 
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
> *Subject: *[AFMUG] optical TX power levels
>
> I got 2x 100gb 80km optics from FS that run difficult default TX power
> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
> devices hosting the optics is the same.
>
>
>
> Has anyone seen much difference between optic like this? My sample size is
> small due to the optices costing $4k each
>
>
>
> --
>
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>
> My website <http://zachunderwood.me>
>
> advance-networking.com
>
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
>
>
> --
> AF mailing list
> AF@af.afmug.

Re: [AFMUG] optical TX power levels

[Daniel Pautz via AF]

Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the strands.

From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

Did anyone do dispersion testing on the fiber?

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell
www.mccowntech.com<http://www.mccowntech.com>
www.microtrench-blades.com<http://www.microtrench-blades.com>
www.terabitnetworks.com<http://www.terabitnetworks.com>

From: Zach Underwood
Sent: Wednesday, January 24, 2024 12:07 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] optical TX power levels

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km.

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
mailto:cstann...@gmail.com>> wrote:
So both of those SFPs are within the tx power range.

100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end.

You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
mailto:zunder1...@gmail.com>> wrote:

TX Power   2~6.5dBm

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up.

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km.

switch is Arista DCS-7060SX2-48YC6-R

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032=3462585

On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
mailto:cstann...@gmail.com>> wrote:
There should be. What does their datasheey indicate for tx power range?

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
mailto:zunder1...@gmail.com>> wrote:
Yep labels identical but there is a difference in default power levels.

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett 
mailto:af...@ics-il.net>> wrote:
Oh, meaning the variance between the two, otherwise identical models?


-
Mike Hammett
Intelligent Computing Solutions<http://www.ics-il.com/>
[http://www.ics-il.com/images/fbicon.png]<https://www.facebook.com/ICSIL>[http://www.ics-il.com/images/googleicon.png]<https://plus.google.com/+IntelligentComputingSolutionsDeKalb>[http://www.ics-il.com/images/linkedinicon.png]<https://www.linkedin.com/company/intelligent-computing-solutions>[http://www.ics-il.com/images/twittericon.png]<https://twitter.com/ICSIL>
Midwest Internet Exchange<http://www.midwest-ix.com/>
[http://www.ics-il.com/images/fbicon.png]<https://www.facebook.com/mdwestix>[http://www.ics-il.com/images/linkedinicon.png]<https://www.linkedin.com/company/midwest-internet-exchange>[http://www.ics-il.com/images/twittericon.png]<https://twitter.com/mdwestix>
The Brothers WISP<http://www.thebrotherswisp.com/>
[http://www.ics-il.com/images/fbicon.png]<https://www.facebook.com/thebrotherswisp>[http://www.ics-il.com/images/youtubeicon.png]


<https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>

From: "Zach Underwood" mailto:zunder1...@gmail.com>>
To: "AnimalFarm Microwave Users Group" mailto:af@af.afmug.com>>
Sent: Tuesday, January 23, 2024 12:51:39 PM
Subject: [AFMUG] optical TX power levels
I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same.

Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each

--
Zach Underwood (RHCE,RHCSA,RHCT,UACA)
My website<http://zachunderwood.me>
advance-networking.com<http://advance-networking.com>

--
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http://af.afmug.com/mailman/listinfo/af_af.afmug.com

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http://a

Re: [AFMUG] optical TX power levels

[Zach Underwood]

I am not familiar  dispersion testing but we ask the outside plant provider
about  that.

On Wed, Jan 24, 2024 at 1:13 PM Chuck McCown via AF  wrote:

> Did anyone do dispersion testing on the fiber?
>
> Chuck McCown
> McCown Technology Corporation
> 8401 N Commerce Dr
> Lake Point, Utah 84074
> 801-250-9503
> 435-830-4306 cell
> www.mccowntech.com
> www.microtrench-blades.com
> www.terabitnetworks.com
>
> *From:* Zach Underwood
> *Sent:* Wednesday, January 24, 2024 12:07 PM
> *To:* AnimalFarm Microwave Users Group
> *Subject:* Re: [AFMUG] optical TX power levels
>
> tired again this morning and still no link. rx was within 0.3dBm on all 4
> lanes on both sides. We got 10gb 80km to link up. This will do for now. We
> will be looking at getting 40gb 80km single lane optics or adding another
> site to fiber loop to shorten the footage to under 40km.
>
> On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
> wrote:
>
>> So both of those SFPs are within the tx power range.
>>
>> 100G may not work on a link that long unless you have dispersion
>> compensation fiber on the path or in a huge loop in a box style at one end.
>>
>> You likely cannot change tx power levels on those SFPs, they will run at
>> the max they can do for that specific unit.
>>
>>
>> On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
>> wrote:
>>
>>>
>>> TX Power   2~6.5dBm
>>>
>>> I am struggling to get this 100gb link up. In the field this link is
>>> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't
>>> get it to link. I take the same optics to the lab and add 20dbm of 
>>> attenuator
>>> to get almost the same rx levels as the field and it will link up.
>>>
>>> I have added error-correction encoding reed-solomon per the user guide
>>> for links over 40km.
>>>
>>> So far I have not found a way to change the TX levels in arista, the
>>> options are in the CLI but they dont seem to change the outcome. For me
>>> this is the first time dealing with 80km optics or 100gb optics over 10km.
>>>
>>> switch is Arista DCS-7060SX2-48YC6-R
>>>
>>> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
>>> https://www.fs.com/products/115818.html?attribute=29032=3462585
>>>
>>> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
>>> wrote:
>>>
>>>> There should be. What does their datasheey indicate for tx power range?
>>>>
>>>> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
>>>> wrote:
>>>>
>>>>> Yep labels identical but there is a difference in default power levels.
>>>>>
>>>>> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>>>>>
>>>>>> Oh, meaning the variance between the two, otherwise identical models?
>>>>>>
>>>>>>
>>>>>>
>>>>>> -
>>>>>> Mike Hammett
>>>>>> Intelligent Computing Solutions <http://www.ics-il.com/>
>>>>>> <https://www.facebook.com/ICSIL>
>>>>>> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>
>>>>>> <https://www.linkedin.com/company/intelligent-computing-solutions>
>>>>>> <https://twitter.com/ICSIL>
>>>>>> Midwest Internet Exchange <http://www.midwest-ix.com/>
>>>>>> <https://www.facebook.com/mdwestix>
>>>>>> <https://www.linkedin.com/company/midwest-internet-exchange>
>>>>>> <https://twitter.com/mdwestix>
>>>>>> The Brothers WISP <http://www.thebrotherswisp.com/>
>>>>>> <https://www.facebook.com/thebrotherswisp>
>>>>>>
>>>>>>
>>>>>> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
>>>>>> --
>>>>>> *From: *"Zach Underwood" 
>>>>>> *To: *"AnimalFarm Microwave Users Group" 
>>>>>> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
>>>>>> *Subject: *[AFMUG] optical TX power levels
>>>>>>
>>>>>> I got 2x 100gb 80km optics from FS that run difficult default TX
>>>>>> power levels one is 3.81dBm and the other 2.63dBm, the config on the 
>>>>>> arista
>>>>>> devices hosting the optics is the same.
>>>>>>
>>>>>> Has anyone seen

Re: [AFMUG] optical TX power levels

[Chuck McCown via AF]

Did anyone do dispersion testing on the fiber?

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell 
www.mccowntech.com
www.microtrench-blades.com
www.terabitnetworks.com


From: Zach Underwood 
Sent: Wednesday, January 24, 2024 12:07 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] optical TX power levels

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km. 

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners  wrote:

  So both of those SFPs are within the tx power range. 

  100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end. 

  You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.



  On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:


TX Power   2~6.5dBm



I am struggling to get this 100gb link up. In the field this link is quoted 
at 31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the 
options are in the CLI but they dont seem to change the outcome. For me this is 
the first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R


https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032=3462585


On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners  wrote:

  There should be. What does their datasheey indicate for tx power range?

  On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood  
wrote:

Yep labels identical but there is a difference in default power levels.

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

  Oh, meaning the variance between the two, otherwise identical models?




  -
  Mike Hammett
  Intelligent Computing Solutions

  Midwest Internet Exchange

  The Brothers WISP






--

  From: "Zach Underwood" 
  To: "AnimalFarm Microwave Users Group" 
  Sent: Tuesday, January 23, 2024 12:51:39 PM
      Subject: [AFMUG] optical TX power levels


  I got 2x 100gb 80km optics from FS that run difficult default TX 
power levels one is 3.81dBm and the other 2.63dBm, the config on the arista 
devices hosting the optics is the same. 

  Has anyone seen much difference between optic like this? My sample 
size is small due to the optices costing $4k each


  -- 

  Zach Underwood (RHCE,RHCSA,RHCT,UACA) 
  My website

  advance-networking.com


  -- 
  AF mailing list
  AF@af.afmug.com
  http://af.afmug.com/mailman/listinfo/af_af.afmug.com


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-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA) 
My website

advance-networking.com

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

  -- 
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  AF@af.afmug.com
  http://af.afmug.com/mailman/listinfo/af_af.afmug.com



-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA) 
My website

advance-networking.com




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Re: [AFMUG] optical TX power levels

[Zach Underwood]

tired again this morning and still no link. rx was within 0.3dBm on all 4
lanes on both sides. We got 10gb 80km to link up. This will do for now. We
will be looking at getting 40gb 80km single lane optics or adding another
site to fiber loop to shorten the footage to under 40km.

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners  wrote:

> So both of those SFPs are within the tx power range.
>
> 100G may not work on a link that long unless you have dispersion
> compensation fiber on the path or in a huge loop in a box style at one end.
>
> You likely cannot change tx power levels on those SFPs, they will run at
> the max they can do for that specific unit.
>
>
> On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
> wrote:
>
>>
>> TX Power   2~6.5dBm
>>
>> I am struggling to get this 100gb link up. In the field this link is
>> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I
>> can't get it to link. I take the same optics to the lab and add 20dbm of 
>> attenuator
>> to get almost the same rx levels as the field and it will link up.
>>
>> I have added error-correction encoding reed-solomon per the user guide
>> for links over 40km.
>>
>> So far I have not found a way to change the TX levels in arista, the
>> options are in the CLI but they dont seem to change the outcome. For me
>> this is the first time dealing with 80km optics or 100gb optics over 10km.
>>
>> switch is Arista DCS-7060SX2-48YC6-R
>>
>> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
>> https://www.fs.com/products/115818.html?attribute=29032=3462585
>>
>> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
>> wrote:
>>
>>> There should be. What does their datasheey indicate for tx power range?
>>>
>>> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
>>> wrote:
>>>
>>>> Yep labels identical but there is a difference in default power levels.
>>>>
>>>> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>>>>
>>>>> Oh, meaning the variance between the two, otherwise identical models?
>>>>>
>>>>>
>>>>>
>>>>> -
>>>>> Mike Hammett
>>>>> Intelligent Computing Solutions <http://www.ics-il.com/>
>>>>> <https://www.facebook.com/ICSIL>
>>>>> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>
>>>>> <https://www.linkedin.com/company/intelligent-computing-solutions>
>>>>> <https://twitter.com/ICSIL>
>>>>> Midwest Internet Exchange <http://www.midwest-ix.com/>
>>>>> <https://www.facebook.com/mdwestix>
>>>>> <https://www.linkedin.com/company/midwest-internet-exchange>
>>>>> <https://twitter.com/mdwestix>
>>>>> The Brothers WISP <http://www.thebrotherswisp.com/>
>>>>> <https://www.facebook.com/thebrotherswisp>
>>>>>
>>>>>
>>>>> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
>>>>> --
>>>>> *From: *"Zach Underwood" 
>>>>> *To: *"AnimalFarm Microwave Users Group" 
>>>>> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
>>>>> *Subject: *[AFMUG] optical TX power levels
>>>>>
>>>>> I got 2x 100gb 80km optics from FS that run difficult default TX power
>>>>> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
>>>>> devices hosting the optics is the same.
>>>>>
>>>>> Has anyone seen much difference between optic like this? My sample
>>>>> size is small due to the optices costing $4k each
>>>>>
>>>>> --
>>>>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>>>>> My website <http://zachunderwood.me>
>>>>> advance-networking.com
>>>>>
>>>>> --
>>>>> AF mailing list
>>>>> AF@af.afmug.com
>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>>>
>>>>> --
>>>>> AF mailing list
>>>>> AF@af.afmug.com
>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>>>
>>>> --
>>>> AF mailing list
>>>> AF@af.afmug.com
>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>>
>>> --
>>> AF mailing list
>>> AF@af.afmug.com
>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>
>>
>>
>> --
>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>> My website <http://zachunderwood.me>
>> advance-networking.com
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
> --
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> AF@af.afmug.com
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>


-- 
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My website <http://zachunderwood.me>
advance-networking.com
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Re: [AFMUG] optical TX power levels

[Colin Stanners]

So both of those SFPs are within the tx power range.

100G may not work on a link that long unless you have dispersion
compensation fiber on the path or in a huge loop in a box style at one end.

You likely cannot change tx power levels on those SFPs, they will run at
the max they can do for that specific unit.


On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:

>
> TX Power   2~6.5dBm
>
> I am struggling to get this 100gb link up. In the field this link is
> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I
> can't get it to link. I take the same optics to the lab and add 20dbm of 
> attenuator
> to get almost the same rx levels as the field and it will link up.
>
> I have added error-correction encoding reed-solomon per the user guide for
> links over 40km.
>
> So far I have not found a way to change the TX levels in arista, the
> options are in the CLI but they dont seem to change the outcome. For me
> this is the first time dealing with 80km optics or 100gb optics over 10km.
>
> switch is Arista DCS-7060SX2-48YC6-R
>
> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
> https://www.fs.com/products/115818.html?attribute=29032=3462585
>
> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
> wrote:
>
>> There should be. What does their datasheey indicate for tx power range?
>>
>> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
>> wrote:
>>
>>> Yep labels identical but there is a difference in default power levels.
>>>
>>> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>>>
>>>> Oh, meaning the variance between the two, otherwise identical models?
>>>>
>>>>
>>>>
>>>> -
>>>> Mike Hammett
>>>> Intelligent Computing Solutions <http://www.ics-il.com/>
>>>> <https://www.facebook.com/ICSIL>
>>>> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>
>>>> <https://www.linkedin.com/company/intelligent-computing-solutions>
>>>> <https://twitter.com/ICSIL>
>>>> Midwest Internet Exchange <http://www.midwest-ix.com/>
>>>> <https://www.facebook.com/mdwestix>
>>>> <https://www.linkedin.com/company/midwest-internet-exchange>
>>>> <https://twitter.com/mdwestix>
>>>> The Brothers WISP <http://www.thebrotherswisp.com/>
>>>> <https://www.facebook.com/thebrotherswisp>
>>>>
>>>>
>>>> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
>>>> --
>>>> *From: *"Zach Underwood" 
>>>> *To: *"AnimalFarm Microwave Users Group" 
>>>> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
>>>> *Subject: *[AFMUG] optical TX power levels
>>>>
>>>> I got 2x 100gb 80km optics from FS that run difficult default TX power
>>>> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
>>>> devices hosting the optics is the same.
>>>>
>>>> Has anyone seen much difference between optic like this? My sample size
>>>> is small due to the optices costing $4k each
>>>>
>>>> --
>>>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>>>> My website <http://zachunderwood.me>
>>>> advance-networking.com
>>>>
>>>> --
>>>> AF mailing list
>>>> AF@af.afmug.com
>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>>
>>>> --
>>>> AF mailing list
>>>> AF@af.afmug.com
>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>>
>>> --
>>> AF mailing list
>>> AF@af.afmug.com
>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
>
>
> --
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
> My website <http://zachunderwood.me>
> advance-networking.com
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
-- 
AF mailing list
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Re: [AFMUG] optical TX power levels

[castarritt]

Do you need dispersion compensation for 100GBASE-ZR4?

On Wed, Jan 24, 2024 at 8:03 AM Mike Hammett  wrote:

> Well, and it would depend on which type of 100G. Some is 10x10, some is
> 25x4, and some is 100x1.
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions <http://www.ics-il.com/>
> <https://www.facebook.com/ICSIL>
> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>
> <https://www.linkedin.com/company/intelligent-computing-solutions>
> <https://twitter.com/ICSIL>
> Midwest Internet Exchange <http://www.midwest-ix.com/>
> <https://www.facebook.com/mdwestix>
> <https://www.linkedin.com/company/midwest-internet-exchange>
> <https://twitter.com/mdwestix>
> The Brothers WISP <http://www.thebrotherswisp.com/>
> <https://www.facebook.com/thebrotherswisp>
>
>
> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
> --
> *From: *dmmoff...@gmail.com
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Wednesday, January 24, 2024 7:53:21 AM
> *Subject: *Re: [AFMUG] optical TX power levels
>
> 100 gig is going to have I believe 4 wavelengths.  This command shows you
> the level on each channel:
>
>
>
> show interfaces et31/1 transceiver dom
>
>
>
> I think if one channel isn’t connected you wouldn’t get 100G link, but
> you’d still have receive power.  Bends and such can impact one channel and
> not another.
>
>
>
> This is just a WAG.  Good luck, sir.
>
>
>
>
>
>
>
> *From:* AF  *On Behalf Of *Zach Underwood
> *Sent:* Wednesday, January 24, 2024 8:45 AM
> *To:* AnimalFarm Microwave Users Group 
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
>
> *TX Power*   2~6.5dBm
>
>
>
> I am struggling to get this 100gb link up. In the field this link is
> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I
> can't get it to link. I take the same optics to the lab and add 20dbm of 
> attenuator
> to get almost the same rx levels as the field and it will link up.
>
> I have added error-correction encoding reed-solomon per the user guide for
> links over 40km.
>
> So far I have not found a way to change the TX levels in arista, the
> options are in the CLI but they dont seem to change the outcome. For me
> this is the first time dealing with 80km optics or 100gb optics over 10km.
>
> switch is Arista DCS-7060SX2-48YC6-R
>
>
>
> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
> https://www.fs.com/products/115818.html?attribute=29032=3462585
>
>
>
> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
> wrote:
>
> There should be. What does their datasheey indicate for tx power range?
>
>
>
> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
> wrote:
>
> Yep labels identical but there is a difference in default power levels.
>
>
>
> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>
> Oh, meaning the variance between the two, otherwise identical models?
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions <http://www.ics-il.com/>
> [image: Image removed by sender.] <https://www.facebook.com/ICSIL>[image:
> Image removed by sender.]
> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>[image:
> Image removed by sender.]
> <https://www.linkedin.com/company/intelligent-computing-solutions>[image:
> Image removed by sender.] <https://twitter.com/ICSIL>
> Midwest Internet Exchange <http://www.midwest-ix.com/>
> [image: Image removed by sender.] <https://www.facebook.com/mdwestix>[image:
> Image removed by sender.]
> <https://www.linkedin.com/company/midwest-internet-exchange>[image: Image
> removed by sender.] <https://twitter.com/mdwestix>
> The Brothers WISP <http://www.thebrotherswisp.com/>
> [image: Image removed by sender.]
> <https://www.facebook.com/thebrotherswisp>[image: Image removed by
> sender.]
>
>
> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
> --
>
> *From: *"Zach Underwood" 
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
> *Subject: *[AFMUG] optical TX power levels
>
> I got 2x 100gb 80km optics from FS that run difficult default TX power
> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
> devices hosting the optics is the same.
>
>
>
> Has anyone seen much difference between optic like this? My sample size is
> small due to the optices costing $4k each
>
>
>
> --
>
> Zach Underwood (RHCE,RHCSA

Re: [AFMUG] optical TX power levels

[Mike Hammett]

Well, and it would depend on which type of 100G. Some is 10x10, some is 25x4, 
and some is 100x1. 




- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 




- Original Message -

From: dmmoff...@gmail.com 
To: "AnimalFarm Microwave Users Group"  
Sent: Wednesday, January 24, 2024 7:53:21 AM 
Subject: Re: [AFMUG] optical TX power levels 



100 gig is going to have I believe 4 wavelengths. This command shows you the 
level on each channel: 

show interfaces et31/1 transceiver dom 

I think if one channel isn’t connected you wouldn’t get 100G link, but you’d 
still have receive power. Bends and such can impact one channel and not 
another. 

This is just a WAG. Good luck, sir. 




From: AF  On Behalf Of Zach Underwood 
Sent: Wednesday, January 24, 2024 8:45 AM 
To: AnimalFarm Microwave Users Group  
Subject: Re: [AFMUG] optical TX power levels 




TX Power 2~6.5dBm 



I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km. 

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R 


https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf 
https://www.fs.com/products/115818.html?attribute=29032=3462585 



On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners < cstann...@gmail.com > wrote: 



There should be. What does their datasheey indicate for tx power range? 



On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood < zunder1...@gmail.com > wrote: 



Yep labels identical but there is a difference in default power levels. 



On Wed, Jan 24, 2024, 8:13 AM Mike Hammett < af...@ics-il.net > wrote: 




Oh, meaning the variance between the two, otherwise identical models? 



- 
Mike Hammett 
Intelligent Computing Solutions 
Image removed by sender.Image removed by sender.Image removed by sender.Image 
removed by sender.
Midwest Internet Exchange 
Image removed by sender.Image removed by sender.Image removed by sender.
The Brothers WISP 
Image removed by sender.Image removed by sender.






From: "Zach Underwood" < zunder1...@gmail.com > 
To: "AnimalFarm Microwave Users Group" < af@af.afmug.com > 
Sent: Tuesday, January 23, 2024 12:51:39 PM 
Subject: [AFMUG] optical TX power levels 

I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same. 



Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each 



-- 






Zach Underwood (RHCE,RHCSA,RHCT,UACA) 



My website 

advance-networking.com 

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http://af.afmug.com/mailman/listinfo/af_af.afmug.com 

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Re: [AFMUG] optical TX power levels

[dmmoffett]

100 gig is going to have I believe 4 wavelengths.  This command shows you the 
level on each channel:

 

show interfaces et31/1 transceiver dom 

 

I think if one channel isn’t connected you wouldn’t get 100G link, but you’d 
still have receive power.  Bends and such can impact one channel and not 
another. 

 

This is just a WAG.  Good luck, sir.

 

 

 

From: AF  On Behalf Of Zach Underwood
Sent: Wednesday, January 24, 2024 8:45 AM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] optical TX power levels

 


TX Power   2~6.5dBm

 

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R

 

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032 
<https://www.fs.com/products/115818.html?attribute=29032=3462585> =3462585

 

On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners mailto:cstann...@gmail.com> > wrote:

There should be. What does their datasheey indicate for tx power range?

 

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood mailto:zunder1...@gmail.com> > wrote:

Yep labels identical but there is a difference in default power levels.

 

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett mailto:af...@ics-il.net> > wrote:

Oh, meaning the variance between the two, otherwise identical models?



-
Mike Hammett
 <http://www.ics-il.com/> Intelligent Computing Solutions
 <https://www.facebook.com/ICSIL>  
<https://plus.google.com/+IntelligentComputingSolutionsDeKalb>  
<https://www.linkedin.com/company/intelligent-computing-solutions>  
<https://twitter.com/ICSIL> 
 <http://www.midwest-ix.com/> Midwest Internet Exchange
 <https://www.facebook.com/mdwestix>  
<https://www.linkedin.com/company/midwest-internet-exchange>  
<https://twitter.com/mdwestix> 
 <http://www.thebrotherswisp.com/> The Brothers WISP
 <https://www.facebook.com/thebrotherswisp>  
<https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg> 





  _  


From: "Zach Underwood" mailto:zunder1...@gmail.com> >
To: "AnimalFarm Microwave Users Group" mailto:af@af.afmug.com> >
Sent: Tuesday, January 23, 2024 12:51:39 PM
Subject: [AFMUG] optical TX power levels

I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same.

 

Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each

 

-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA)

My website <http://zachunderwood.me> 

advance-networking.com <http://advance-networking.com> 


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-- 

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My website <http://zachunderwood.me> 

advance-networking.com <http://advance-networking.com> 

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Re: [AFMUG] optical TX power levels

[dmmoffett]

They auto adjust the Tx.  I haven’t dug deep into how that works, but I would 
assume it’s keyed off the Rx signals.  

However they do it, it’s not unusual for them to land at different levels

 

This is from a pair of 20km transceivers between two Aristas.  They’re not 
FS.com.  The brand is Precision Optical Technologies, and the OEM is usually 
either Finisar or JDSU depending on the model.

 

   Bias  Optical   Optical

  Temp   Voltage   Current   Tx Power  Rx Power   

Port  (Celsius)  (Volts)   (mA)  (dBm) (dBm) Last Update  

Et27/1 34.73  3.27  62.511.79  -5.14 0:00:01 ago

 

 

   Bias  Optical   Optical

  Temp   Voltage   Current   Tx Power  Rx Power   

Port  (Celsius)  (Volts)   (mA)  (dBm) (dBm) Last Update  

Et31/1 35.07  3.29  67.65-0.69 -1.96 0:00:01 ago

 

 

From: AF  On Behalf Of Zach Underwood
Sent: Tuesday, January 23, 2024 1:52 PM
To: AnimalFarm Microwave Users Group 
Subject: [AFMUG] optical TX power levels

 

I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same.

 

Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each

 

-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA)

My website <http://zachunderwood.me> 

advance-networking.com <http://advance-networking.com> 

-- 
AF mailing list
AF@af.afmug.com
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Re: [AFMUG] optical TX power levels

[Zach Underwood]

TX Power   2~6.5dBm

I am struggling to get this 100gb link up. In the field this link is quoted
at 31 miles. The rx levels are -22 and -20 on both sides but I can't get it
to link. I take the same optics to the lab and add 20dbm of attenuator to
get almost the same rx levels as the field and it will link up.

I have added error-correction encoding reed-solomon per the user guide for
links over 40km.

So far I have not found a way to change the TX levels in arista, the
options are in the CLI but they dont seem to change the outcome. For me
this is the first time dealing with 80km optics or 100gb optics over 10km.

switch is Arista DCS-7060SX2-48YC6-R

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032=3462585

On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners  wrote:

> There should be. What does their datasheey indicate for tx power range?
>
> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
> wrote:
>
>> Yep labels identical but there is a difference in default power levels.
>>
>> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>>
>>> Oh, meaning the variance between the two, otherwise identical models?
>>>
>>>
>>>
>>> -
>>> Mike Hammett
>>> Intelligent Computing Solutions <http://www.ics-il.com/>
>>> <https://www.facebook.com/ICSIL>
>>> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>
>>> <https://www.linkedin.com/company/intelligent-computing-solutions>
>>> <https://twitter.com/ICSIL>
>>> Midwest Internet Exchange <http://www.midwest-ix.com/>
>>> <https://www.facebook.com/mdwestix>
>>> <https://www.linkedin.com/company/midwest-internet-exchange>
>>> <https://twitter.com/mdwestix>
>>> The Brothers WISP <http://www.thebrotherswisp.com/>
>>> <https://www.facebook.com/thebrotherswisp>
>>>
>>>
>>> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
>>> --
>>> *From: *"Zach Underwood" 
>>> *To: *"AnimalFarm Microwave Users Group" 
>>> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
>>> *Subject: *[AFMUG] optical TX power levels
>>>
>>> I got 2x 100gb 80km optics from FS that run difficult default TX power
>>> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
>>> devices hosting the optics is the same.
>>>
>>> Has anyone seen much difference between optic like this? My sample size
>>> is small due to the optices costing $4k each
>>>
>>> --
>>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>>> My website <http://zachunderwood.me>
>>> advance-networking.com
>>>
>>> --
>>> AF mailing list
>>> AF@af.afmug.com
>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>
>>> --
>>> AF mailing list
>>> AF@af.afmug.com
>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>


-- 
Zach Underwood (RHCE,RHCSA,RHCT,UACA)
My website <http://zachunderwood.me>
advance-networking.com
-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Colin Stanners]

There should be. What does their datasheey indicate for tx power range?

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood  wrote:

> Yep labels identical but there is a difference in default power levels.
>
> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>
>> Oh, meaning the variance between the two, otherwise identical models?
>>
>>
>>
>> -
>> Mike Hammett
>> Intelligent Computing Solutions <http://www.ics-il.com/>
>> <https://www.facebook.com/ICSIL>
>> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>
>> <https://www.linkedin.com/company/intelligent-computing-solutions>
>> <https://twitter.com/ICSIL>
>> Midwest Internet Exchange <http://www.midwest-ix.com/>
>> <https://www.facebook.com/mdwestix>
>> <https://www.linkedin.com/company/midwest-internet-exchange>
>> <https://twitter.com/mdwestix>
>> The Brothers WISP <http://www.thebrotherswisp.com/>
>> <https://www.facebook.com/thebrotherswisp>
>>
>>
>> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
>> --
>> *From: *"Zach Underwood" 
>> *To: *"AnimalFarm Microwave Users Group" 
>> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
>> *Subject: *[AFMUG] optical TX power levels
>>
>> I got 2x 100gb 80km optics from FS that run difficult default TX power
>> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
>> devices hosting the optics is the same.
>>
>> Has anyone seen much difference between optic like this? My sample size
>> is small due to the optices costing $4k each
>>
>> --
>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>> My website <http://zachunderwood.me>
>> advance-networking.com
>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
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Re: [AFMUG] optical TX power levels

[Zach Underwood]

Yep labels identical but there is a difference in default power levels.

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

> Oh, meaning the variance between the two, otherwise identical models?
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions <http://www.ics-il.com/>
> <https://www.facebook.com/ICSIL>
> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>
> <https://www.linkedin.com/company/intelligent-computing-solutions>
> <https://twitter.com/ICSIL>
> Midwest Internet Exchange <http://www.midwest-ix.com/>
> <https://www.facebook.com/mdwestix>
> <https://www.linkedin.com/company/midwest-internet-exchange>
> <https://twitter.com/mdwestix>
> The Brothers WISP <http://www.thebrotherswisp.com/>
> <https://www.facebook.com/thebrotherswisp>
>
>
> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
> --
> *From: *"Zach Underwood" 
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
> *Subject: *[AFMUG] optical TX power levels
>
> I got 2x 100gb 80km optics from FS that run difficult default TX power
> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
> devices hosting the optics is the same.
>
> Has anyone seen much difference between optic like this? My sample size is
> small due to the optices costing $4k each
>
> --
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
> My website <http://zachunderwood.me>
> advance-networking.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Colin Stanners]

Many SFPs say up to 5dB variance in their specs, but luckily I've only
experienced up to 2-3dB. 1.2dB variance is small.


On Wed, Jan 24, 2024, 7:13 a.m. Mike Hammett  wrote:

> Oh, meaning the variance between the two, otherwise identical models?
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions <http://www.ics-il.com/>
> <https://www.facebook.com/ICSIL>
> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb>
> <https://www.linkedin.com/company/intelligent-computing-solutions>
> <https://twitter.com/ICSIL>
> Midwest Internet Exchange <http://www.midwest-ix.com/>
> <https://www.facebook.com/mdwestix>
> <https://www.linkedin.com/company/midwest-internet-exchange>
> <https://twitter.com/mdwestix>
> The Brothers WISP <http://www.thebrotherswisp.com/>
> <https://www.facebook.com/thebrotherswisp>
>
>
> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg>
> --
> *From: *"Zach Underwood" 
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
> *Subject: *[AFMUG] optical TX power levels
>
> I got 2x 100gb 80km optics from FS that run difficult default TX power
> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
> devices hosting the optics is the same.
>
> Has anyone seen much difference between optic like this? My sample size is
> small due to the optices costing $4k each
>
> --
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
> My website <http://zachunderwood.me>
> advance-networking.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
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AF@af.afmug.com
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Re: [AFMUG] optical TX power levels

[Mike Hammett]

Oh, meaning the variance between the two, otherwise identical models? 




- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 




- Original Message -

From: "Zach Underwood"  
To: "AnimalFarm Microwave Users Group"  
Sent: Tuesday, January 23, 2024 12:51:39 PM 
Subject: [AFMUG] optical TX power levels 


I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same. 


Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each 



-- 






Zach Underwood (RHCE,RHCSA,RHCT, UACA ) 


My website 

advance-networking.com 

-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 

-- 
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[AFMUG] optical TX power levels

[Zach Underwood]

I got 2x 100gb 80km optics from FS that run difficult default TX power
levels one is 3.81dBm and the other 2.63dBm, the config on the arista
devices hosting the optics is the same.

Has anyone seen much difference between optic like this? My sample size is
small due to the optices costing $4k each

-- 
Zach Underwood (RHCE,RHCSA,RHCT,UACA)
My website 
advance-networking.com
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