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
<mailto:af@af.afmug.com>> wrote:
Dispersion compensation module -
https://www.fs.com/products/65783.html
*From:*AF <af-boun...@af.afmug.com
<mailto: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
<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 <af-boun...@af.afmug.com
<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 <af@af.afmug.com
<mailto:af@af.afmug.com>>
*Cc:* Daniel Pautz <d...@webnx.com <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 <af-boun...@af.afmug.com
<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' <af@af.afmug.com
<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 <af-boun...@af.afmug.com
<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 <af@af.afmug.com
<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
<af@af.afmug.com <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 <af-boun...@af.afmug.com
<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 <af@af.afmug.com
<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
<cstann...@gmail.com <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
<zunder1...@gmail.com <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&id=3462585
On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners
<cstann...@gmail.com <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
<zunder1...@gmail.com
<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
<af...@ics-il.net <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/>
Midwest Internet Exchange
The Brothers WISP
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*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
<https://www.facebook.com/ICSIL>*
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.
<https://www.facebook.com/ICSIL>
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Has anyone seen much difference between
optic like this? My sample size is small
due to the optices costing $4k each
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