Archived from groups: comp.dcom.lans.ethernet (
More info?)
mfeldchtein@hotmail.com wrote:
>
> James Knott wrote:
>> mfeldchtein@hotmail.com wrote:
>>
>> > I design the Ethernet device that will be used mainly in PoE networks.
>> > But I want to insert the addition power entry from external power
>> > supplier to provide a possibility to use the same device in not-PoE
>> > network. Is it possible to do? Will the PoE powered device compatible
>> > to not-PoE switch and will it work in the case that I supply the power
>> > from external PSU?
>>
>> It strikes me odd, that you're able to design such a device and don't
>> know
>> about hooking up power supplies. This would be a trivial matter for
>> anyone
>> with experience designing electronic equipment. Yes, it is possible to
>> do that and in fact there are a couple of method that could be use.
>
> James, I think you did not understood my question or I did not asked
> correctly. the more qorrect question may be so: my device is POE
> powered. I will connect it to not-POE switch and provide power from
> external PCU, and I choose my device to be powered from this PSU
> (disconnect POE module output from the circuit). At this time POE
> module remaine to be connected to Ethernet lines and to switch that
> does not work with POE. Does it work or produces a conflict between
> switch and my device on ethrenet lines?
Again, if you're the designer, it should be a trivial problem. The two
methods are:
Use a tap, designed for injecting PoE power onto the line. This can be done
at either end.
Or, use a separate supply to the device and not use PoE. It's a very simple
problem. If you use a "wall wart" type power supply, the connector on your
device can disconnect the PoE power.