I think there's some truth to that. There are real reasons for phone lines to run at -48V, and they've been doing so for a long time. So the logical assumption from a manufacturer would be that a -48v device is for a phone company. A phone company needs reliability and probably has the money to pay for it, so the price has two reasons to go up: once to pay for the reliability, and again because they know the buyer has big pockets.

The reason for people who aren't phone companies to run -48v is that they want to access the ecosystem of power products that was made for phone companies. And yeah, I think you do pay more to play in the -48v sandbox.

-Adam



------ Original Message ------
From: "Robert Andrews" <i...@avantwireless.com>
To: af@af.afmug.com
Sent: 6/21/2018 3:55:41 PM
Subject: Re: [AFMUG] ePMP voltages again - specifically 2ghz

Oh.. the "Real Telecom Players"... vs all those that have provided internet all over the place that the "Real Telecom Players" thumbed their noses at... Sorry that concept doesn't mean sweet thoughts to me... But yes 48V is the sweet spot, I just can't get behind -48v... Even when science To me it just means a way to jack prices...

On 06/21/2018 10:59 AM, ch...@wbmfg.com wrote:
It was always 48 for the real telecom players.
*From:* Josh Luthman
*Sent:* Thursday, June 21, 2018 11:52 AM
*To:* Mathew Howard
*Cc:* Chuck McCown ; AFMUG
*Subject:* Re: [AFMUG] ePMP voltages again - specifically 2ghz
It was 48v
Then it was mostly 24v
Now it's going 48v
Just give it a little bit, it'll go back to 24v.
I'd rather get a power supply doing 26v to fix my problem in 2 minutes than start changing things to 48v which would blow so much stuff up (epmp non gps, ubnt M gear, half the Mikrotiks)
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Thu, Jun 21, 2018 at 1:05 PM, Mathew Howard <mhoward...@gmail.com> wrote:

   No, there's not really a good reason, it just means you have an
   extra part to deal with.
   We still use UBNT for our 2.4ghz stuff, but those are the only
radios that won't run off 48v on most of our new sites, so I've done
   some that are 48v only and just use those things on the radios that
   need them. But if you have more than 1 or 2 things that need 24v,
it's generally more practical to just use a bigger voltage converter
   and run multiple radios off it.
   On Thu, Jun 21, 2018 at 11:57 AM, <ch...@wbmfg.com> wrote:

       Yep, that was what I was thinking.
       So, looks to me like there is no reason not to do 48 volts.
       *From:* Mathew Howard
       *Sent:* Thursday, June 21, 2018 10:56 AM
       *To:* Chuck McCown
       *Cc:* Dave ; AFMUG
       *Subject:* Re: [AFMUG] ePMP voltages again - specifically 2ghz
       You mean like this?
https://www.ubnt.com/accessories/instant-8023af-adapters/
       <https://www.ubnt.com/accessories/instant-8023af-adapters/>
       Or do you have something better in mind?
       On Thu, Jun 21, 2018 at 11:53 AM, <ch...@wbmfg.com> wrote:

           Me too...
           So, what appetite is there for an inline POE regulator that
           would convert 48 to 24?
           *From:* Mathew Howard
           *Sent:* Thursday, June 21, 2018 10:50 AM
           *To:* Dave
           *Cc:* AFMUG
*Subject:* Re: [AFMUG] ePMP voltages again - specifically 2ghz
           ugh... I keep forgetting to use reply-to-all...
           Not every single UBNT radio... all the airfibers will
           happily take 48v. Mikrotik is finally starting to make most
           of the new stuff handle 48v (including the PowerBox Pro),
but yeah. UBNT is the reason I still have to use 24v on most
           of our towers... they make a converter you can stick on in
           line with the radios, but that's kind of a pain if you have
           more than one or two, and it's an extra part to fail.
On Thu, Jun 21, 2018 at 11:46 AM, Dave <dmilho...@wletc.com>
           wrote:

               They make dental floss for that  :)


               On 06/21/2018 11:39 AM, Josh Luthman wrote:
               Except for every single Ubnt device and a majority of
               Mikrotiks....
               Josh Luthman
               Office: 937-552-2340
               Direct: 937-552-2343
               1100 Wayne St
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+%0D%0A++++45373&entry=gmail&source=g>
               Suite 1337
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+%0D%0A++++45373&entry=gmail&source=g>
               Troy, OH 45373
<https://maps.google.com/?q=1100+%0D%0A++++++Wayne+St+Suite+%0D%0A++++++1337+Troy,+OH+45373&entry=gmail&source=g>
               On Thu, Jun 21, 2018 at 12:39 PM, Josh Baird
               <joshba...@gmail.com> wrote:

I promise life will be easier if you just use 48V. :)
                   On Thu, Jun 21, 2018 at 12:35 PM, Josh Luthman
                   <j...@imaginenetworksllc.com> wrote:

                       I'm trying to use a Powerbox Pro to power up
                       two epmp APs.  The 5 GHz is just fine but the
                       2 GHz is saying current too low.  Both ports
                       are getting 23 volts and the cables are <10
                       feet (from the Powerbox Pro).
                       Does anyone know if the 2ghz requires more
                       voltage possibly?
                       Spec sheet does say 23 volts min but it's
weird one powers (5 ghz) and the other doesn't.
                       Josh Luthman
                       Office: 937-552-2340
                       Direct: 937-552-2343
                       1100 Wayne St
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g>
                       Suite 1337
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g>
                       Troy, OH 45373
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g>
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