Re: [AFMUG] -48vdc site

[Bill Prince]

Chuck worked in telco in a previous life. He explained there is some 
kind of electrolysis that happens when you do negative ground. So telcos 
all standardized on -48V (positive ground).


bp


On 5/2/2022 3:02 PM, Dennis Burgess wrote:

So, this is interesting thread, my question is why?

What is better -48 or +48?  Or any of those options.  Why does telcom 
standardize on -48?  There has to be a reason?



Dennis Burgess, Mikrotik Certified Trainer
MTCNA, MTCRE, MTCWE, MTCTCE, MTCINE, MTCSE, HE IPv6 Sage, Cambium ePMP Certified
Author of "Learn RouterOS- Second Edition”
Link Technologies, Inc -- Mikrotik & WISP Support Services
Office: 314-735-0270  Website: http://www.linktechs.net
Create Wireless Coverage’s with www.towercoverage.com

-Original Message-
From: AF  On Behalf Of Chuck McCown via AF
Sent: Monday, May 2, 2022 2:25 PM
To: AnimalFarm Microwave Users Group 
Cc: Chuck McCown 
Subject: Re: [AFMUG] -48vdc site

+ goes to +

- goes to -

Always.

Giving something -48 means you have grounded the + side of the power supply.

Giving something + 48 means you have grounded the - side of the power supply.

Giving something 48 might mean neither side is grounded and it is a floating 
power supply.

Some devices use chassis ground in common with the power input.  If a device 
grounds the negative side of the power input internally, then it will need a 
positive or floating supply.

If a device grounds the + side of the power circuit internally then it needs a 
negative or floating supply.  Lots of telecom gear is in this category.

If you take a device and measure each side of the power input to ground, and 
find continuity from + or - to the chassis, you need to match that to the 
polarity.

If you measure it and find no connection to the chassis, there is a chance it 
does not care.  However powered off continuity measurements could change with 
power on.  If you have it powered on on the bench and measure from the chassis 
to either side of the power input, and get a strong reading matching the input 
voltage on one of the leads, the the input of the device is definitely using 
the chassis as a ground.  The ground can be positive or negative, whatever the 
designer decided it was.

But you can still run -48 devices off of floating 48.  And  you can run them 
off of +48 under certain circumstances.
1)  You have to insulate the chassis from ground.  Best to put a warning sign 
on it that the chassis is hot.
2)It cannot have any external connections that contain a chassis
connection like a coax with the shield connected to the chassis.  A CAT5 cable 
drain wire would also short it out.  As would most POE configurations.
If it is a router, in a plastic box, without POE connections,  you might get 
away with it.

-Original Message-
From: Christopher Tyler
Sent: Monday, May 2, 2022 1:08 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] -48vdc site

So when I hook that up to -48vdc, do I just give it -48 or do the leads need to 
be reversed?

--
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
https://imsva91-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=www.totalhighspeed.com&umid=DA1B4682-DE0E-8C05-B4D1-EEC052AE5800&auth=079c058f437b7c6303d36c6513e5e8848d0c5ac4-1b5009a16c4202d4b572fc090c86aa255586d48f

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de oportunidades.

- Original Message -

From: "castarritt" 
To: "AnimalFarm Microwave Users Group" 
Sent: Monday, May 2, 2022 1:58:47 PM
Subject: Re: [AFMUG] -48vdc site
I asked this list the same thing a while back and the answer was
Meanwell RSD-500C-48. You can probably get away with a lower power
rating than the
500
watt I chose if you are only powering a 'tik and not a pile of Cambium
radios like I was.

On Mon, May 2, 2022 at 1:48 PM Christopher Tyler < [
mailto:ch...@totalhighspeed.net | ch...@totalhighspeed.net ] > wrote:


Need some help from the smarter than me electrical engineers here on
the list...

What is the best way to power a Mikrotik router that takes +18-56vdc
from -48vdc source? Providing part numbers or model numbers would be
greatly appreciated.

We tried the redneck engineering approach of just reversing the
polarity and it popped the fuse, nice little light show, but
ultimately unproductive.

--
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
[ 
https://imsva91-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=http%3a%2f%2fwww.totalhighspeed.com&umid=DA1B4682-DE0E-8C05-B4D1-EEC052AE5800&auth=079c058f437b7c6303d36c6513e5e8848d0c5ac4-8afeff0d3de40be7cc2ad8e7616a489241467f52
 | 
https://imsva91-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=www.totalhighspeed.com&umid=DA1B4682-DE0E-8C05-B4D1-E

Re: [AFMUG] -48vdc site

[Chuck McCown via AF]

There is a reason.  If you have a fault in a buried copper telephone cable, 
if a conductor is -48 to ground, electrons will flow out of the fault and 
ions will flow in.  The wire will actually get larger due to electrolysis.


If you have +48, the copper wire would copper plate the surrounding earth. 
And of course the wire would go away.


-Original Message- 
From: Dennis Burgess

Sent: Monday, May 2, 2022 4:02 PM
To: AnimalFarm Microwave Users Group
Cc: Chuck McCown
Subject: RE: [AFMUG] -48vdc site

So, this is interesting thread, my question is why?

What is better -48 or +48?  Or any of those options.  Why does telcom 
standardize on -48?  There has to be a reason?




Dennis Burgess, Mikrotik Certified Trainer
MTCNA, MTCRE, MTCWE, MTCTCE, MTCINE, MTCSE, HE IPv6 Sage, Cambium ePMP 
Certified

Author of "Learn RouterOS- Second Edition”
Link Technologies, Inc -- Mikrotik & WISP Support Services
Office: 314-735-0270  Website: http://www.linktechs.net
Create Wireless Coverage’s with www.towercoverage.com

-Original Message-
From: AF  On Behalf Of Chuck McCown via AF
Sent: Monday, May 2, 2022 2:25 PM
To: AnimalFarm Microwave Users Group 
Cc: Chuck McCown 
Subject: Re: [AFMUG] -48vdc site

+ goes to +

- goes to -

Always.

Giving something -48 means you have grounded the + side of the power supply.

Giving something + 48 means you have grounded the - side of the power 
supply.


Giving something 48 might mean neither side is grounded and it is a floating 
power supply.


Some devices use chassis ground in common with the power input.  If a device 
grounds the negative side of the power input internally, then it will need a 
positive or floating supply.


If a device grounds the + side of the power circuit internally then it needs 
a negative or floating supply.  Lots of telecom gear is in this category.


If you take a device and measure each side of the power input to ground, and 
find continuity from + or - to the chassis, you need to match that to the 
polarity.


If you measure it and find no connection to the chassis, there is a chance 
it does not care.  However powered off continuity measurements could change 
with power on.  If you have it powered on on the bench and measure from the 
chassis to either side of the power input, and get a strong reading matching 
the input voltage on one of the leads, the the input of the device is 
definitely using the chassis as a ground.  The ground can be positive or 
negative, whatever the designer decided it was.


But you can still run -48 devices off of floating 48.  And  you can run them 
off of +48 under certain circumstances.
1)  You have to insulate the chassis from ground.  Best to put a warning 
sign on it that the chassis is hot.

2)It cannot have any external connections that contain a chassis
connection like a coax with the shield connected to the chassis.  A CAT5 
cable drain wire would also short it out.  As would most POE configurations.
If it is a router, in a plastic box, without POE connections,  you might get 
away with it.


-Original Message-
From: Christopher Tyler
Sent: Monday, May 2, 2022 1:08 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] -48vdc site

So when I hook that up to -48vdc, do I just give it -48 or do the leads need 
to be reversed?


--
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
https://imsva91-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=www.totalhighspeed.com&umid=DA1B4682-DE0E-8C05-B4D1-EEC052AE5800&auth=079c058f437b7c6303d36c6513e5e8848d0c5ac4-1b5009a16c4202d4b572fc090c86aa255586d48f

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de oportunidades.

- Original Message -

From: "castarritt" 
To: "AnimalFarm Microwave Users Group" 
Sent: Monday, May 2, 2022 1:58:47 PM
Subject: Re: [AFMUG] -48vdc site



I asked this list the same thing a while back and the answer was
Meanwell RSD-500C-48. You can probably get away with a lower power
rating than the
500
watt I chose if you are only powering a 'tik and not a pile of Cambium
radios like I was.

On Mon, May 2, 2022 at 1:48 PM Christopher Tyler < [
mailto:ch...@totalhighspeed.net | ch...@totalhighspeed.net ] > wrote:


Need some help from the smarter than me electrical engineers here on
the list...

What is the best way to power a Mikrotik router that takes +18-56vdc
from -48vdc source? Providing part numbers or model numbers would be
greatly appreciated.

We tried the redneck engineering approach of just reversing the
polarity and it popped the fuse, nice little light show, but
ultimately unproductive.

--
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
[ 
https://imsva91-ctp.trendmicro.com:443/wis/clicktime/v1/quer

Re: [AFMUG] -48vdc site

[Dennis Burgess]

So, this is interesting thread, my question is why?  

What is better -48 or +48?  Or any of those options.  Why does telcom 
standardize on -48?  There has to be a reason? 



Dennis Burgess, Mikrotik Certified Trainer
MTCNA, MTCRE, MTCWE, MTCTCE, MTCINE, MTCSE, HE IPv6 Sage, Cambium ePMP 
Certified 
Author of "Learn RouterOS- Second Edition” 
Link Technologies, Inc -- Mikrotik & WISP Support Services 
Office: 314-735-0270  Website: http://www.linktechs.net 
Create Wireless Coverage’s with www.towercoverage.com 

-Original Message-
From: AF  On Behalf Of Chuck McCown via AF
Sent: Monday, May 2, 2022 2:25 PM
To: AnimalFarm Microwave Users Group 
Cc: Chuck McCown 
Subject: Re: [AFMUG] -48vdc site

+ goes to +

- goes to -

Always.

Giving something -48 means you have grounded the + side of the power supply.

Giving something + 48 means you have grounded the - side of the power supply.

Giving something 48 might mean neither side is grounded and it is a floating 
power supply.

Some devices use chassis ground in common with the power input.  If a device 
grounds the negative side of the power input internally, then it will need a 
positive or floating supply.

If a device grounds the + side of the power circuit internally then it needs a 
negative or floating supply.  Lots of telecom gear is in this category.

If you take a device and measure each side of the power input to ground, and 
find continuity from + or - to the chassis, you need to match that to the 
polarity.

If you measure it and find no connection to the chassis, there is a chance it 
does not care.  However powered off continuity measurements could change with 
power on.  If you have it powered on on the bench and measure from the chassis 
to either side of the power input, and get a strong reading matching the input 
voltage on one of the leads, the the input of the device is definitely using 
the chassis as a ground.  The ground can be positive or negative, whatever the 
designer decided it was.

But you can still run -48 devices off of floating 48.  And  you can run them 
off of +48 under certain circumstances.
1)  You have to insulate the chassis from ground.  Best to put a warning sign 
on it that the chassis is hot.
2)It cannot have any external connections that contain a chassis 
connection like a coax with the shield connected to the chassis.  A CAT5 cable 
drain wire would also short it out.  As would most POE configurations. 
If it is a router, in a plastic box, without POE connections,  you might get 
away with it.

-Original Message-
From: Christopher Tyler
Sent: Monday, May 2, 2022 1:08 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] -48vdc site

So when I hook that up to -48vdc, do I just give it -48 or do the leads need to 
be reversed?

--
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
https://imsva91-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=www.totalhighspeed.com&umid=DA1B4682-DE0E-8C05-B4D1-EEC052AE5800&auth=079c058f437b7c6303d36c6513e5e8848d0c5ac4-1b5009a16c4202d4b572fc090c86aa255586d48f

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de oportunidades.

- Original Message -
> From: "castarritt" 
> To: "AnimalFarm Microwave Users Group" 
> Sent: Monday, May 2, 2022 1:58:47 PM
> Subject: Re: [AFMUG] -48vdc site

> I asked this list the same thing a while back and the answer was 
> Meanwell RSD-500C-48. You can probably get away with a lower power 
> rating than the
> 500
> watt I chose if you are only powering a 'tik and not a pile of Cambium 
> radios like I was.
>
> On Mon, May 2, 2022 at 1:48 PM Christopher Tyler < [ 
> mailto:ch...@totalhighspeed.net | ch...@totalhighspeed.net ] > wrote:
>
>
> Need some help from the smarter than me electrical engineers here on 
> the list...
>
> What is the best way to power a Mikrotik router that takes +18-56vdc 
> from -48vdc source? Providing part numbers or model numbers would be 
> greatly appreciated.
>
> We tried the redneck engineering approach of just reversing the 
> polarity and it popped the fuse, nice little light show, but 
> ultimately unproductive.
>
> --
> Christopher Tyler
> Senior Network Engineer
> MTCRE/MTCNA/MTCTCE/MTCWE
>
> Total Highspeed Internet Solutions
> 1091 W. Kathryn Street
> Nixa, MO 65714
> (417) 851-1107 x. 9002
> [ 
> https://imsva91-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=http%3a%2f%2fwww.totalhighspeed.com&umid=DA1B4682-DE0E-8C05-B4D1-EEC052AE5800&auth=079c058f437b7c6303d36c6513e5e8848d0c5ac4-8afeff0d3de40be7cc2ad8e7616a489241467f52
>  | 
> https://imsva91-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=www.totalhighspeed.com&umid=DA1B4682-DE0E-8C05-B4D1-EEC052AE5800&auth=079c058f437b7c6303d36c6513e5e8848d0c5ac4-1b5009a16c4202d4b572fc090c86aa255586d48f
>  ]
>
> This institution is an equal opportunity

Re: [AFMUG] -48vdc site

[Christopher Tyler]

Thanks for all the information. We've opted to get some Mwanwell DC-DC 
converters just to be on the safe side.

-- 
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
www.totalhighspeed.com

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de oportunidades.

- Original Message -
> From: "TJ Trout" 
> To: "AnimalFarm Microwave Users Group" 
> Sent: Monday, May 2, 2022 4:15:23 PM
> Subject: Re: [AFMUG] -48vdc site

> many devices now are isolated, you can check the router case to each terminal
> +/- on the input and see if any are referenced, if not it will work on -48 or
> +48. For example the ccr1072 and now ccr2116,2216, etc have a '-48v' power
> supply, but it's actually isolated and worked on either.
> 
> 48v is 48v, as chuck said the only difference is which side +/- is grounded to
> the rack, tower, etc
> 
> 
> 
> On Mon, May 2, 2022 at 1:32 PM < [ mailto:dmmoff...@gmail.com |
> dmmoff...@gmail.com ] > wrote:
> 
> 
> 
> 
> 
> I keep Meanwell RSD-150C-48 in stock. I’d strongly suggest the RSD rather than
> the SD model. SD is slightly cheaper, but RSD handles faults better.
> 
> 
> 
> The important part is C-48, that’s 48 in and 48 out.
> 
> 150 is max wattage.
> 
> 
> 
> The dimensions are such that you can bolt it to the back of a 1U blank panel 
> and
> it will occupy 1RU without a shelf.
> 
> 
> 
> 
> 
> 
> From: AF < [ mailto:af-boun...@af.afmug.com | af-boun...@af.afmug.com ] > On
> Behalf Of castarritt
> Sent: Monday, May 02, 2022 2:59 PM
> To: AnimalFarm Microwave Users Group < [ mailto:af@af.afmug.com |
> af@af.afmug.com ] >
> Subject: Re: [AFMUG] -48vdc site
> 
> 
> 
> 
> 
> I asked this list the same thing a while back and the answer was Meanwell
> RSD-500C-48. You can probably get away with a lower power rating than the 500
> watt I chose if you are only powering a 'tik and not a pile of Cambium radios
> like I was.
> 
> 
> 
> 
> 
> On Mon, May 2, 2022 at 1:48 PM Christopher Tyler < [
> mailto:ch...@totalhighspeed.net | ch...@totalhighspeed.net ] > wrote:
> 
> 
> 
> 
> Need some help from the smarter than me electrical engineers here on the 
> list...
> 
> What is the best way to power a Mikrotik router that takes +18-56vdc from 
> -48vdc
> source? Providing part numbers or model numbers would be greatly appreciated.
> 
> We tried the redneck engineering approach of just reversing the polarity and 
> it
> popped the fuse, nice little light show, but ultimately unproductive.
> 
> --
> Christopher Tyler
> Senior Network Engineer
> MTCRE/MTCNA/MTCTCE/MTCWE
> 
> Total Highspeed Internet Solutions
> 1091 W. Kathryn Street
> Nixa, MO 65714
> (417) 851-1107 x. 9002
> [ http://www.totalhighspeed.com/ | www.totalhighspeed.com ]
> 
> This institution is an equal opportunity provider and employer.
> Esta institución es un proveedor de servicios con igualdad de oportunidades.
> 
> --
> AF mailing list
> [ mailto:AF@af.afmug.com | AF@af.afmug.com ]
> [ http://af.afmug.com/mailman/listinfo/af_af.afmug.com |
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com ]
> --
> AF mailing list
> [ mailto:AF@af.afmug.com | AF@af.afmug.com ]
> [ http://af.afmug.com/mailman/listinfo/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] -48vdc site

[TJ Trout]

many devices now are isolated, you can check the router case to each
terminal +/- on the input and see if any are referenced, if not it will
work on -48 or +48. For example the ccr1072 and now ccr2116,2216, etc have
a '-48v' power supply, but it's actually isolated and worked on either.

48v is 48v, as chuck said the only difference is which side +/- is grounded
to the rack, tower, etc



On Mon, May 2, 2022 at 1:32 PM  wrote:

> I keep Meanwell RSD-150C-48 in stock.  I’d strongly suggest the RSD rather
> than the SD model.  SD is slightly cheaper, but RSD handles faults better.
>
>
>
> The important part is C-48, that’s 48 in and 48 out.
>
> 150 is max wattage.
>
>
>
> The dimensions are such that you can bolt it to the back of a 1U blank
> panel and it will occupy 1RU without a shelf.
>
>
>
>
>
> *From:* AF  *On Behalf Of *castarritt
> *Sent:* Monday, May 02, 2022 2:59 PM
> *To:* AnimalFarm Microwave Users Group 
> *Subject:* Re: [AFMUG] -48vdc site
>
>
>
> I asked this list the same thing a while back and the answer was Meanwell
> RSD-500C-48.  You can probably get away with a lower power rating than the
> 500 watt I chose if you are only powering a 'tik and not a pile of Cambium
> radios like I was.
>
>
>
> On Mon, May 2, 2022 at 1:48 PM Christopher Tyler 
> wrote:
>
> Need some help from the smarter than me electrical engineers here on the
> list...
>
> What is the best way to power a Mikrotik router that takes +18-56vdc from
> -48vdc source? Providing part numbers or model numbers would be greatly
> appreciated.
>
> We tried the redneck engineering approach of just reversing the polarity
> and it popped the fuse, nice little light show, but ultimately unproductive.
>
> --
> Christopher Tyler
> Senior Network Engineer
> MTCRE/MTCNA/MTCTCE/MTCWE
>
> Total Highspeed Internet Solutions
> 1091 W. Kathryn Street
> Nixa, MO 65714
> (417) 851-1107 x. 9002
> www.totalhighspeed.com
>
> This institution is an equal opportunity provider and employer.
> Esta institución es un proveedor de servicios con igualdad de
> oportunidades.
>
> --
> 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] -48vdc site

[dmmoffett]

I keep Meanwell RSD-150C-48 in stock.  I’d strongly suggest the RSD rather than 
the SD model.  SD is slightly cheaper, but RSD handles faults better.

 

The important part is C-48, that’s 48 in and 48 out.

150 is max wattage.  

 

The dimensions are such that you can bolt it to the back of a 1U blank panel 
and it will occupy 1RU without a shelf.

 

 

From: AF  On Behalf Of castarritt
Sent: Monday, May 02, 2022 2:59 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] -48vdc site

 

I asked this list the same thing a while back and the answer was Meanwell 
RSD-500C-48.  You can probably get away with a lower power rating than the 500 
watt I chose if you are only powering a 'tik and not a pile of Cambium radios 
like I was.

 

On Mon, May 2, 2022 at 1:48 PM Christopher Tyler mailto:ch...@totalhighspeed.net> > wrote:

Need some help from the smarter than me electrical engineers here on the list...

What is the best way to power a Mikrotik router that takes +18-56vdc from 
-48vdc source? Providing part numbers or model numbers would be greatly 
appreciated.

We tried the redneck engineering approach of just reversing the polarity and it 
popped the fuse, nice little light show, but ultimately unproductive.

-- 
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
www.totalhighspeed.com  

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de oportunidades.

-- 
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] -48vdc site

[Josh Luthman]

96 volt difference from -48 and +48.  Not the same.

On Mon, May 2, 2022 at 3:27 PM Christopher Tyler 
wrote:

> Nevermind, I see that there is a + ad - and a GND. Nice.
>
> --
> Christopher Tyler
> Senior Network Engineer
> MTCRE/MTCNA/MTCTCE/MTCWE
>
> Total Highspeed Internet Solutions
> 1091 W. Kathryn Street
> Nixa, MO 65714
> (417) 851-1107 x. 9002
> www.totalhighspeed.com
>
> This institution is an equal opportunity provider and employer.
> Esta institución es un proveedor de servicios con igualdad de
> oportunidades.
>
> - Original Message -
> > From: "Chris Tyler" 
> > To: "AnimalFarm Microwave Users Group" 
> > Sent: Monday, May 2, 2022 2:08:21 PM
> > Subject: Re: [AFMUG] -48vdc site
>
> > So when I hook that up to -48vdc, do I just give it -48 or do the leads
> need to
> > be reversed?
> >
> > --
> > Christopher Tyler
> > Senior Network Engineer
> > MTCRE/MTCNA/MTCTCE/MTCWE
> >
> > Total Highspeed Internet Solutions
> > 1091 W. Kathryn Street
> > Nixa, MO 65714
> > (417) 851-1107 x. 9002
> > www.totalhighspeed.com
> >
> > This institution is an equal opportunity provider and employer.
> > Esta institución es un proveedor de servicios con igualdad de
> oportunidades.
> >
> > - Original Message -
> >> From: "castarritt" 
> >> To: "AnimalFarm Microwave Users Group" 
> >> Sent: Monday, May 2, 2022 1:58:47 PM
> >> Subject: Re: [AFMUG] -48vdc site
> >
> >> I asked this list the same thing a while back and the answer was
> Meanwell
> >> RSD-500C-48. You can probably get away with a lower power rating than
> the 500
> >> watt I chose if you are only powering a 'tik and not a pile of Cambium
> radios
> >> like I was.
> >>
> >> On Mon, May 2, 2022 at 1:48 PM Christopher Tyler < [
> >> mailto:ch...@totalhighspeed.net | ch...@totalhighspeed.net ] > wrote:
> >>
> >>
> >> Need some help from the smarter than me electrical engineers here on
> the list...
> >>
> >> What is the best way to power a Mikrotik router that takes +18-56vdc
> from -48vdc
> >> source? Providing part numbers or model numbers would be greatly
> appreciated.
> >>
> >> We tried the redneck engineering approach of just reversing the
> polarity and it
> >> popped the fuse, nice little light show, but ultimately unproductive.
> >>
> >> --
> >> Christopher Tyler
> >> Senior Network Engineer
> >> MTCRE/MTCNA/MTCTCE/MTCWE
> >>
> >> Total Highspeed Internet Solutions
> >> 1091 W. Kathryn Street
> >> Nixa, MO 65714
> >> (417) 851-1107 x. 9002
> >> [ http://www.totalhighspeed.com/ | www.totalhighspeed.com ]
> >>
> >> This institution is an equal opportunity provider and employer.
> >> Esta institución es un proveedor de servicios con igualdad de
> oportunidades.
> >>
> >> --
> >> AF mailing list
> >> [ mailto:AF@af.afmug.com | AF@af.afmug.com ]
> >> [ http://af.afmug.com/mailman/listinfo/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
> >
> > --
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> > AF@af.afmug.com
> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
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Re: [AFMUG] -48vdc site

[Chuck McCown via AF]

+ goes to +

- goes to -

Always.

Giving something -48 means you have grounded the + side of the power supply.

Giving something + 48 means you have grounded the - side of the power 
supply.


Giving something 48 might mean neither side is grounded and it is a floating 
power supply.


Some devices use chassis ground in common with the power input.  If a device 
grounds the negative side of the power input internally, then it will need a 
positive or floating supply.


If a device grounds the + side of the power circuit internally then it needs 
a negative or floating supply.  Lots of telecom gear is in this category.


If you take a device and measure each side of the power input to ground, and 
find continuity from + or - to the chassis, you need to match that to the 
polarity.


If you measure it and find no connection to the chassis, there is a chance 
it does not care.  However powered off continuity measurements could change 
with power on.  If you have it powered on on the bench and measure from the 
chassis to either side of the power input, and get a strong reading matching 
the input voltage on one of the leads, the the input of the device is 
definitely using the chassis as a ground.  The ground can be positive or 
negative, whatever the designer decided it was.


But you can still run -48 devices off of floating 48.  And  you can run them 
off of +48 under certain circumstances.
1)  You have to insulate the chassis from ground.  Best to put a warning 
sign on it that the chassis is hot.
2)It cannot have any external connections that contain a chassis 
connection like a coax with the shield connected to the chassis.  A CAT5 
cable drain wire would also short it out.  As would most POE configurations. 
If it is a router, in a plastic box, without POE connections,  you might get 
away with it.


-Original Message- 
From: Christopher Tyler

Sent: Monday, May 2, 2022 1:08 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] -48vdc site

So when I hook that up to -48vdc, do I just give it -48 or do the leads need 
to be reversed?


--
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
www.totalhighspeed.com

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de oportunidades.

- Original Message -

From: "castarritt" 
To: "AnimalFarm Microwave Users Group" 
Sent: Monday, May 2, 2022 1:58:47 PM
Subject: Re: [AFMUG] -48vdc site



I asked this list the same thing a while back and the answer was Meanwell
RSD-500C-48. You can probably get away with a lower power rating than the 
500
watt I chose if you are only powering a 'tik and not a pile of Cambium 
radios

like I was.

On Mon, May 2, 2022 at 1:48 PM Christopher Tyler < [
mailto:ch...@totalhighspeed.net | ch...@totalhighspeed.net ] > wrote:


Need some help from the smarter than me electrical engineers here on the 
list...


What is the best way to power a Mikrotik router that takes +18-56vdc 
from -48vdc
source? Providing part numbers or model numbers would be greatly 
appreciated.


We tried the redneck engineering approach of just reversing the polarity 
and it

popped the fuse, nice little light show, but ultimately unproductive.

--
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
[ http://www.totalhighspeed.com/ | www.totalhighspeed.com ]

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de 
oportunidades.


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Re: [AFMUG] -48vdc site

[Christopher Tyler]

Nevermind, I see that there is a + ad - and a GND. Nice.

-- 
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
www.totalhighspeed.com

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de oportunidades.

- Original Message -
> From: "Chris Tyler" 
> To: "AnimalFarm Microwave Users Group" 
> Sent: Monday, May 2, 2022 2:08:21 PM
> Subject: Re: [AFMUG] -48vdc site

> So when I hook that up to -48vdc, do I just give it -48 or do the leads need 
> to
> be reversed?
> 
> --
> Christopher Tyler
> Senior Network Engineer
> MTCRE/MTCNA/MTCTCE/MTCWE
> 
> Total Highspeed Internet Solutions
> 1091 W. Kathryn Street
> Nixa, MO 65714
> (417) 851-1107 x. 9002
> www.totalhighspeed.com
> 
> This institution is an equal opportunity provider and employer.
> Esta institución es un proveedor de servicios con igualdad de oportunidades.
> 
> - Original Message -
>> From: "castarritt" 
>> To: "AnimalFarm Microwave Users Group" 
>> Sent: Monday, May 2, 2022 1:58:47 PM
>> Subject: Re: [AFMUG] -48vdc site
> 
>> I asked this list the same thing a while back and the answer was Meanwell
>> RSD-500C-48. You can probably get away with a lower power rating than the 500
>> watt I chose if you are only powering a 'tik and not a pile of Cambium radios
>> like I was.
>> 
>> On Mon, May 2, 2022 at 1:48 PM Christopher Tyler < [
>> mailto:ch...@totalhighspeed.net | ch...@totalhighspeed.net ] > wrote:
>> 
>> 
>> Need some help from the smarter than me electrical engineers here on the 
>> list...
>> 
>> What is the best way to power a Mikrotik router that takes +18-56vdc from 
>> -48vdc
>> source? Providing part numbers or model numbers would be greatly appreciated.
>> 
>> We tried the redneck engineering approach of just reversing the polarity and 
>> it
>> popped the fuse, nice little light show, but ultimately unproductive.
>> 
>> --
>> Christopher Tyler
>> Senior Network Engineer
>> MTCRE/MTCNA/MTCTCE/MTCWE
>> 
>> Total Highspeed Internet Solutions
>> 1091 W. Kathryn Street
>> Nixa, MO 65714
>> (417) 851-1107 x. 9002
>> [ http://www.totalhighspeed.com/ | www.totalhighspeed.com ]
>> 
>> This institution is an equal opportunity provider and employer.
>> Esta institución es un proveedor de servicios con igualdad de oportunidades.
>> 
>> --
>> AF mailing list
>> [ mailto:AF@af.afmug.com | AF@af.afmug.com ]
>> [ http://af.afmug.com/mailman/listinfo/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
> 
> --
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Re: [AFMUG] -48vdc site

[Christopher Tyler]

So when I hook that up to -48vdc, do I just give it -48 or do the leads need to 
be reversed?

-- 
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
www.totalhighspeed.com

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de oportunidades.

- Original Message -
> From: "castarritt" 
> To: "AnimalFarm Microwave Users Group" 
> Sent: Monday, May 2, 2022 1:58:47 PM
> Subject: Re: [AFMUG] -48vdc site

> I asked this list the same thing a while back and the answer was Meanwell
> RSD-500C-48. You can probably get away with a lower power rating than the 500
> watt I chose if you are only powering a 'tik and not a pile of Cambium radios
> like I was.
> 
> On Mon, May 2, 2022 at 1:48 PM Christopher Tyler < [
> mailto:ch...@totalhighspeed.net | ch...@totalhighspeed.net ] > wrote:
> 
> 
> Need some help from the smarter than me electrical engineers here on the 
> list...
> 
> What is the best way to power a Mikrotik router that takes +18-56vdc from 
> -48vdc
> source? Providing part numbers or model numbers would be greatly appreciated.
> 
> We tried the redneck engineering approach of just reversing the polarity and 
> it
> popped the fuse, nice little light show, but ultimately unproductive.
> 
> --
> Christopher Tyler
> Senior Network Engineer
> MTCRE/MTCNA/MTCTCE/MTCWE
> 
> Total Highspeed Internet Solutions
> 1091 W. Kathryn Street
> Nixa, MO 65714
> (417) 851-1107 x. 9002
> [ http://www.totalhighspeed.com/ | www.totalhighspeed.com ]
> 
> This institution is an equal opportunity provider and employer.
> Esta institución es un proveedor de servicios con igualdad de oportunidades.
> 
> --
> AF mailing list
> [ mailto:AF@af.afmug.com | AF@af.afmug.com ]
> [ http://af.afmug.com/mailman/listinfo/af_af.afmug.com |
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com ]
> 
> --
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> http://af.afmug.com/mailman/listinfo/af_af.afmug.com

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Re: [AFMUG] -48vdc site

[castarritt]

I asked this list the same thing a while back and the answer was Meanwell
RSD-500C-48.  You can probably get away with a lower power rating than the
500 watt I chose if you are only powering a 'tik and not a pile of Cambium
radios like I was.

On Mon, May 2, 2022 at 1:48 PM Christopher Tyler 
wrote:

> Need some help from the smarter than me electrical engineers here on the
> list...
>
> What is the best way to power a Mikrotik router that takes +18-56vdc from
> -48vdc source? Providing part numbers or model numbers would be greatly
> appreciated.
>
> We tried the redneck engineering approach of just reversing the polarity
> and it popped the fuse, nice little light show, but ultimately unproductive.
>
> --
> Christopher Tyler
> Senior Network Engineer
> MTCRE/MTCNA/MTCTCE/MTCWE
>
> Total Highspeed Internet Solutions
> 1091 W. Kathryn Street
> Nixa, MO 65714
> (417) 851-1107 x. 9002
> www.totalhighspeed.com
>
> This institution is an equal opportunity provider and employer.
> Esta institución es un proveedor de servicios con igualdad de
> oportunidades.
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
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Re: [AFMUG] -48vdc site

[Gino A. Villarini]

Meanwell RSD DC-DC converter




[cid:asset9_6087ff1a-e4b2-42dc-8e37-828fd52a1737.png]
Gino Villarini
Founder / President
@GVillarini
787.273.4143 |
[cid:asset7_7460a97c-d1f8-4aa7-a1db-f2a242ae25e4.png]
  [cid:asset4_90de6cc3-6a6e-42ea-8ee1-7c1c75ed1fba.png] 
  
[cid:asset1_8e2690da-eab4-4f70-bc52-aea656beff88.png] 

[cid:asset2_348ee3e1-d43a-4c17-91c2-6c95ac766846.png] 
 
[cid:asset3_4a7ab080-a45e-48d4-a88f-2a02557e530f.png] 
   
[cid:asset5_cb8f047a-701e-4e36-9570-4e6e92f8689c.png] 
   
[cid:asset6@2x_f661ca1c-dcf6-4863-943b-1b6d991f4304.png] 

Metro Office Park #18 Suite 304 Guaynabo, PR 00968

[cid:homefi2022emailsignaturebanner-80_d431b411-e0f5-4655-a8e5-bbef633515b1.jpg]

From: AF  on behalf of Christopher Tyler 

Date: Monday, May 2, 2022 at 2:48 PM
To: AnimalFarm Microwave Users Group 
Subject: [AFMUG] -48vdc site
Need some help from the smarter than me electrical engineers here on the list...

What is the best way to power a Mikrotik router that takes +18-56vdc from 
-48vdc source? Providing part numbers or model numbers would be greatly 
appreciated.

We tried the redneck engineering approach of just reversing the polarity and it 
popped the fuse, nice little light show, but ultimately unproductive.

--
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
www.totalhighspeed.com

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de oportunidades.

--
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[AFMUG] -48vdc site

[Christopher Tyler]

Need some help from the smarter than me electrical engineers here on the list...

What is the best way to power a Mikrotik router that takes +18-56vdc from 
-48vdc source? Providing part numbers or model numbers would be greatly 
appreciated.

We tried the redneck engineering approach of just reversing the polarity and it 
popped the fuse, nice little light show, but ultimately unproductive.

-- 
Christopher Tyler
Senior Network Engineer
MTCRE/MTCNA/MTCTCE/MTCWE

Total Highspeed Internet Solutions
1091 W. Kathryn Street
Nixa, MO 65714
(417) 851-1107 x. 9002
www.totalhighspeed.com

This institution is an equal opportunity provider and employer.
Esta institución es un proveedor de servicios con igualdad de oportunidades.

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

Re: [AFMUG] Pre-terminated direct burial fiber cable

[Josh Luthman]

Tower maybe?

On Mon, May 2, 2022 at 12:27 PM  wrote:

> If you haven't already, you can get a quote for a custom cable assembly
> from Fiber Instrument Sales.
>
> What is the application anyway?  I'm having trouble picturing what you
> would do with 12 fibers going underground between the same two points where
> you'd want them preterminated.  I'd probably rather have a patch panel at
> each end.
>
> -Adam
>
>
> -Original Message-
> From: AF  On Behalf Of fiber...@mail.com
> Sent: Friday, April 29, 2022 3:32 PM
> To: af@af.afmug.com
> Subject: Re: [AFMUG] Pre-terminated direct burial fiber cable
>
> > SC connectors on both ends?
>   Yeah.
>
> >
> https://www.discount-low-voltage.com/Cable/Singlemode-Outdoor-Armored-Preterminated-Fiber/PT12SCSM4-Preterminated-Fiber
>   I had a look at Discount Low Voltage, but the line items keep adding up,
> especially for longer lengths. I was hoping to find a vendor which, if not
> cheaper, then at least not that much more than splicing bulk cable.
>
> - 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] [ External ] Re: 2022 Broadband Service Provider Survey

[Ray Savich via AF]

Got it - Thank you Jaime

From: AF  On Behalf Of Jaime Solorza
Sent: Monday, May 2, 2022 1:05 PM
To: AnimalFarm Microwave Users Group 
Subject: [ External ] Re: [AFMUG] 2022 Broadband Service Provider Survey

Hello...I reached out to your sales team and one of your distributors to help 
with a large competitive bid on a SCADA network to replace EOLed MDS 900MHz 
radios...
Sadly no one responded...
We have another potential project with a military base to upgrade old MDS 
900Mhz radios for water and wastewater applications supporting TCP/IP.
If interested,  the ball is in your court.
Jaime Solorza
915-861-1390

On Mon, May 2, 2022, 8:18 AM Ray Savich via AF 
mailto:af@af.afmug.com>> wrote:
Cambium Networks is committed to the success of broadband service providers 
around the world. We are conducting our sixth annual State of the Broadband 
Service Provider Market Survey. The vendor-neutral survey takes about 10 
minutes to complete. The topics focus on the state of the current business and 
vision of trends and opportunities. Cambium Networks will be glad to provide 
you with a complete report of the survey results.

The 2022 survey is available in 4 languages:

  *   
English
  *   
Italian
  *   
Portuguese
  *   
Spanish


The survey results are expected to be published this summer. In last year's 
survey, more than 400 respondents from 58 countries shared their perspectives. 
You can view the results of the 2021 Survey 
here.
We appreciate you sharing your perspective on the industry.
[LogoDescription automatically generated with medium 
confidence]

Thank You,
Ray Savich
Cambium Networks Marketing

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Re: [AFMUG] Pre-terminated direct burial fiber cable

[dmmoffett]

If you haven't already, you can get a quote for a custom cable assembly from 
Fiber Instrument Sales.

What is the application anyway?  I'm having trouble picturing what you would do 
with 12 fibers going underground between the same two points where you'd want 
them preterminated.  I'd probably rather have a patch panel at each end.

-Adam


-Original Message-
From: AF  On Behalf Of fiber...@mail.com
Sent: Friday, April 29, 2022 3:32 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] Pre-terminated direct burial fiber cable

> SC connectors on both ends?
  Yeah. 

> https://www.discount-low-voltage.com/Cable/Singlemode-Outdoor-Armored-Preterminated-Fiber/PT12SCSM4-Preterminated-Fiber
>  
  I had a look at Discount Low Voltage, but the line items keep adding up, 
especially for longer lengths. I was hoping to find a vendor which, if not 
cheaper, then at least not that much more than splicing bulk cable.

- Jared

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Re: [AFMUG] OT old jokes

[dmmoffett]

Yakov Smirnov? 

 

“In California you can always find a party.  In Russia the party can always 
find you.”

 

And Putin brought it full circle.

 

From: AF  On Behalf Of Chuck McCown via AF
Sent: Friday, April 29, 2022 5:09 PM
To: af@af.afmug.com
Cc: ch...@go-mtc.com
Subject: [AFMUG] OT old jokes

 

Bored.  Here is a very old joke.  

 

Please share yours.

 

College lad out on a date with a town girl.

Trying to impress her he shares some poetry and asks: “Do you like Kipling”?

She replies: “I don’t know you naughty boy, I’ve never Kippled”.

 

 

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Re: [AFMUG] Ot: its home

[Jaime Solorza]

My snowflake virgin ears with all this  double entendre..
Stand behind me Satanno wait, that's not what I meant!!

On Sun, May 1, 2022, 10:09 PM Steve Jones  wrote:

> Im just hoping my pullout game is strong
>
> On Sun, May 1, 2022, 9:56 PM Chuck McCown via AF  wrote:
>
>>
>> Just remember, go easy, don’t get excited and ram it all the way in.
>> Sent from my iPhone
>>
>> On May 1, 2022, at 5:55 PM, Steve Jones 
>> wrote:
>>
>> 
>> Not gonna lie, im excited like the first time i looked up a girls skirt
>> [image: 20220501_094319.jpg]--
>> AF mailing list
>> AF@af.afmug.com
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