Well, for what it is worth...I am using this Trango 1U power supply, the
radio is grounded, and everything is working. Whew!
On Sun, Mar 31, 2019 at 10:36 AM Ken Hohhof <af...@kwisp.com> wrote:
> The Cambium installation guide says the positive side of the DC power
> supply should be grounded. (see attached)
>
>
>
> I don’t know that I trust it. Doesn’t help that it sounds like it was run
> through Google Translate.
>
>
>
>
>
> *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Bill Prince
> *Sent:* Sunday, March 31, 2019 10:57 AM
> *To:* af@af.afmug.com
> *Subject:* Re: [AFMUG] Cambium 820C -48v power supply questions
>
>
>
> It would be simple enough to determine if the device has a floating ground
> or not. Simply start with a power supply that has a floating output and
> connect it to the power input. Then measure the potential between ground
> and each leg.
>
> I have done this in the past with a few different Dragonwave radios. In
> all the cases I looked at, they were floating. This, in spite of the fact
> that they were listed as -48V devices.
>
>
>
> bp
>
> <part15sbs{at}gmail{dot}com>
>
>
>
> On 3/31/2019 8:51 AM, Ken Hohhof wrote:
>
> Yes it is basically a rebranded Ceragon IP20 but still, that’s pretty sad,
> if Cambium support can’t answer a question about how to power it. It’s
> hard to believe nobody at Cambium knows the answer, and if they really
> don’t, they could call Israel and ask.
>
>
>
>
>
> *From:* AF <af-boun...@af.afmug.com> <af-boun...@af.afmug.com> *On Behalf
> Of *Jeremy
> *Sent:* Sunday, March 31, 2019 10:37 AM
> *To:* AnimalFarm Microwave Users Group <af@af.afmug.com> <af@af.afmug.com>
> *Subject:* Re: [AFMUG] Cambium 820C -48v power supply questions
>
>
>
> I am using the DC power connector, not POE. I spoke with Cambium and they
> did not seem to have the answer as to whether or not this would work, and
> the details of their -48v being floating or not.
>
>
>
> On Sat, Mar 30, 2019 at 4:55 PM Ken Hohhof <af...@kwisp.com> wrote:
>
> 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 <af-boun...@af.afmug.com> *On Behalf Of *Gino A. Villarini
> *Sent:* Saturday, March 30, 2019 2:59 PM
> *To:* AnimalFarm Microwave Users Group <af@af.afmug.com>
> *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:
>
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> www.aeronetpr.com | Metro Office Park #18 Suite 304 Guaynabo, PR 00968
>
> *From: *AF <af-boun...@af.afmug.com> on behalf of Jeremy <
> jeremysmi...@gmail.com>
> *Reply-To: *AnimalFarm Microwave Users Group <af@af.afmug.com>
> *Date: *Saturday, March 30, 2019 at 12:12 PM
> *To: *AnimalFarm Microwave Users Group <af@af.afmug.com>
> *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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