If that's the case, I totally agree with you... Electrically test each individual wire to the chassis/shield/ground lug/coax connector outsides, making sure there's no conductivity (with the caveat that there may be capacitors to ground which will show brief moments of connectivity as you initially hook it up).
Then, power on the radio, using an isolated power supply. Repeat the above tests using a voltmeter instead - you shouldn't see any meaningful voltages. I'm in the process of trying to gather this type of information for each common radio/poe device. It's slow going and there are of course other things which always seem to be higher priority. On Thu, Jun 28, 2018 at 10:56 AM, <[email protected]> wrote: > The conversation originally started with –48 power sources and was it safe > to power an ethernet device off of such a supply. > Is the power galvanically isolated from any ground/shield type of > connections on the device. > > *From:* Forrest Christian (List Account) > *Sent:* Thursday, June 28, 2018 10:36 AM > *To:* AnimalFarm Microwave Users Group > *Subject:* Re: [AFMUG] How To Test Port For Magnetics? > > Could you clarify a bit what you mean by isolate? > > This could mean: > > The PoE and the lan sides are electrically separate (i.e. there's a set of > ethernet magnetics in it). > or > The power supply is electrically isolated on each port > or > There is no ground connection > or > ..... > > When you start talking PoE there are lots of ways to arrange the power > injection. For instance, on all gigabit power injectors that packetflux > currently makes, the LAN side of the injector is totally electrically > isolated from everything else. The PoE side has pins tied to either power > or return/neutral depending on how jumpers get set, with the note that by > 'tied' means that we're connecting the center tap on the magnetics to those > pins. > > Other injectors (and perhaps upcoming ones from packetflux) have fully > isolated DC power on the PoE, so there isn't any direct connection from the > PoE port to the source power supply. > > > > On Thu, Jun 28, 2018 at 10:00 AM, Christopher Gray < > [email protected]> wrote: > >> Chuck (Well, directed at Chuck, but interested to hear if anyone else has >> ideas), >> >> What would you consider a reliable method for checking a port for magnets >> / Ethernet transformers / isolation modules? Is it just a matter of testing >> the individual pairs for resistance or continuity? >> >> Every time I want to know if a port will isolate PoE on its own, I just >> crack the device open, and look. I'd like to be able to test externally if >> possible. >> >> Thanks for the help - Chris >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> > > > -- > *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* > Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 > [email protected] | http://www.packetflux.com > <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> > <http://twitter.com/@packetflux> > > ------------------------------ > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 [email protected] | http://www.packetflux.com <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> <http://twitter.com/@packetflux>
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