I've blown a couple fuses in my day, but it's always been because I
unwittingly have a -v device on the same power supply as a +v device. I
don't doubt that +v and -v power supplies exist, but I haven't yet
actually used one that had any ground connection to the DC
output....even units that were specifically sold to power -48v devices.
------ Original Message ------
From: "Jon Langeler" <[email protected]>
To: [email protected]
Sent: 12/7/2016 12:56:12 PM
Subject: Re: [AFMUG] WTB IP-20C POE
With that said you will likely need a -48v power supply to directly
power the radio when mounted to a tower. A +48 will work fine when
powering it in the office. But as soon as it's grounded, that will
short the power supply out. That is based on my experience. Trango also
sells a -48 power supply that is wall mount.
Jon Langeler
Michwave Technologies, Inc.
On Dec 7, 2016, at 11:09 AM, Faisal Imtiaz <[email protected]>
wrote:
Hi Mark,
Just to make sure there this is no confusion in the 'lingo'
820C/IP20c is designed to run on -48v DC (telecom power plant), and
the radio gets powder via the Ethernet cable (POE)
The external POE Injector device is presented as a DC-DC converter..
The question was is this necessary when using +48vdc power source or
just a matter of changing polarity...
Regards.
Faisal Imtiaz
Snappy Internet & Telecom
7266 SW 48 Street
Miami, FL 33155
Tel: 305 663 5518 x 232
Help-desk: (305)663-5518 Option 2 or Email: [email protected]
----- Original Message -----
From: "Mark Radabaugh" <[email protected]>
To: [email protected]
Sent: Wednesday, December 7, 2016 10:56:06 AM
Subject: Re: [AFMUG] WTB IP-20C POE
The answer to the question:
The 820C runs perfectly fine on -48VDC run directly to the radio.
You do not need the POE adapter unless you really want to run them
using POE.
I do not explicitly know if they will run on +48VDC - I believe they
will but
have not actually tried that.
We have quite a few running on -48VDC from Emerson and Eltek
rectifier shelfs.
Mark
On Dec 7, 2016, at 10:20 AM, [email protected] wrote:
yes
-----Original Message----- From: Faisal Imtiaz
Sent: Tuesday, December 6, 2016 5:13 PM
To: [email protected]
Subject: Re: [AFMUG] WTB IP-20C POE
Hi Chuck...
This may be an opportunity to clarify something...
According to the specs Ceragon IP-20c is a -48vdc radio.
Their POE box/adapter, takes 48v dc or 24v dc and powers the radio.
There has not been any clear answer if their Radios will run on
regular 48vdc
directly ...
There have been folks who have 'tested' the cambium 820 version of
these
plugging directly on the Netonix switches.
In my opinion, these are not 'in-expensive' radios that I would
risk installing
in-correctly.
In recommending your injector / surge protector as a solution, my
question would
be.
1) can we do -48v dc power via these devices ? it is just a matter
of making
sure the polarity of the dc cable is correct ? or is there more to
it.
Regards
Faisal Imtiaz
----- Original Message -----
From: "Chuck McCown" <[email protected]>
To: [email protected]
Sent: Tuesday, December 6, 2016 6:08:49 PM
Subject: Re: [AFMUG] WTB IP-20C POE
I am hurt...
http://www.mccowntech.com/800-gige-poe-outdoor-midspan-poe-injector-ethernet-surge-protector/
http://www.mccowntech.com/800-gige-poe-apc-rack-mount-surge-protector-power-inserter/
Sheesh!
-----Original Message-----
From: Faisal Imtiaz
Sent: Tuesday, December 06, 2016 3:55 PM
To: [email protected]
Subject: Re: [AFMUG] WTB IP-20C POE
Some suggestions:-
for the POE injector...
you can try a Cambium Reseller.
you can possibly by them on Ebay (shipping from Israel)
you can try Surplus Wireless Gear folks too.
In regards to the Power Supply, that is a straight forward 48v DC
power
supply (Brick).
Regards
Faisal Imtiaz
Snappy Internet & Telecom
7266 SW 48 Street
Miami, FL 33155
Tel: 305 663 5518 x 232
Help-desk: (305)663-5518 Option 2 or Email:
[email protected]
----- Original Message -----
From: "Sterling Jacobson" <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Tuesday, December 6, 2016 5:45:19 PM
Subject: [AFMUG] WTB IP-20C POE
Somehow I misplaced my Ceragon POE injector and power supplies
during a
cabinet
move.
Anyone happen to have a Ceragon IP-20C compatible POE unit they
could sell
me?
I think the power supplies probably aren't that hard to find, but
the POE
apparently is.
