It sounds like he wants to use the DC power connector.
Cambium doesn’t do a very good job of answering the question in any of their documentation. Several places they refer to the direct DC power as -48 which I would take to mean positive side grounded. One tends to assume that when powering via POE, the radio takes the DC from the Ethernet transformers and uses it just like it would direct DC power, but I’m kind of getting the impression that’s not true. PTP820C/S can definitely accept floating power via POE, and I could swear I have several sites using +48 VDC power (negative side grounded) for POE via a GIGE-POE-APC. Keep in mind that no matter which side of the power supply is grounded, + goes to + and - goes to -. That seems to confuse some people. You might want to open a support case on the Cambium website and get them to answer the question. From: AF <[email protected]> On Behalf Of Gino A. Villarini Sent: Saturday, March 30, 2019 2:59 PM To: AnimalFarm Microwave Users Group <[email protected]> Subject: Re: [AFMUG] Cambium 820C -48v power supply questions Are you using Trango POE? IIRC it’s a proprietary pinout.. Gino Villarini Founder/President @gvillarini t: 787.273.4143 Ext. 204 m: <http://www.aeronetpr.com/> <https://www.inc.com/profile/aeronet> <https://www.facebook.com/aeronetpr/> <https://www.instagram.com/aeronetpr/?hl=en> <https://www.linkedin.com/company/aeronet-broadband-corp> <https://twitter.com/AeroNetPR?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor> <https://www.youtube.com/channel/UCr2Q9WBrAYVm3Fn970Jd6VA> <http://www.aeronetpr.com> www.aeronetpr.com | Metro Office Park #18 Suite 304 Guaynabo, PR 00968 From: AF <[email protected]> on behalf of Jeremy <[email protected]> Reply-To: AnimalFarm Microwave Users Group <[email protected]> Date: Saturday, March 30, 2019 at 12:12 PM To: AnimalFarm Microwave Users Group <[email protected]> Subject: [AFMUG] Cambium 820C -48v power supply questions I am confused. I have a 6A rackmount Trango Power supply http://www.silverbranch.com/Useppa/DS-9030-C-Giga-PowerSupply-1U-48.pdf that I would like to use to power an 820C. I hooked it up -48v and it would not power on. I hooked it up +48v and it worked perfectly. This is on the bench and not installed. I am hearing from others on here that the power supply will short as soon as I ground the radio if I actually run it at +48v. So I have a few questions....why won't this power up at -48v? I really don't want to use POE. What are people using to power these? Any reason that this Trango Power supply should be not working?
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