It’s marked -48V on the power connector. I don’t think I would try floating a ground with it to use +48. If you only have +48 a Meanwell DC/DC converter to get -48V is a lot less expensive than the POE injector. Of course maybe you want POE in which case it might justify the cost.
We routinely run these with a 2x22 gauge copper + 2 fiber cable where we use the copper as the -48V/0V and the fiber for data. We do not connect the POE/Copper Ethernet port, or the 3rd management port. Mark Radabaugh Amplex 22690 Pemberville Rd Luckey, OH 43443 419-837-5015 x1021 419-261-5996 (cell) [email protected] > 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.
