[Asterisk-Users] Polycom 501 power over ethernet

[William M Conlon]

I saw that Polycom offered a cable (not stocked anywhere), at $40 a  
pop for 802.3af connections.  That's what made me think the phone  
itself is NOT 802.3af compliant.

Presumably, for $40, there's more than a fuse in that special cable.

On Mar 5, 2006, at 4:31 PM, Paul Hales wrote:

> For Polycom IP500/501's and IP300/301's you need a special polycom POE
> cable.
>
> When you buy Polycom phones you can usually specify POE or powerpack.
>
> PaulH
>
> On Sun, 2006-03-05 at 16:23 -0800, William M Conlon wrote:
>> When I bought two Polycom 501 SIP phones, I naively thought they were
>> Power-over-Ethernet (IEEE 802.3af) because they were "powered over
>> ethernet."  Silly me.
>>
>> Polycom must have some odd voltage or funny way of injecting the
>> power, because the POE switch I bought for them (Netgear F at 510P)
>> won't power them, though if I use the Polycom-supplied AC adapter and
>> ethernet power injector cable, they work with the switch in either
>> its powered or unpowered ports.
>>
>> Anyhow, I hadn't seen any mention of how people power these phones,
>> as I had planned on centralizing phone power on a UPS to supply my
>> Asterisk server and POE switch.  Now the question is:
>>
>> Can the Polycom AC-powered injector be used with a standard ethernet
>> patch cable:
>>
>> 	switch :: Polycom injector cable :: RJ45 coupler :: patch cable ::
>> Polycom 501
>>
>> which would allow me to power the Polycom AC adapters by my UPS.  Or
>> do I need to provide a UPS at each phone and run the ethernet like
>>
>> 	switch :: patch cable :: RJ45 coupler :: Polycom injector cable ::
>> Polycom 501
>>
>> thanks.
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Bill

William M. Conlon, P.E., Ph.D.
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