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 -------------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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