[asterisk-users] Polycom Power

[David Gomillion]

I was reading somewhere that Polycom cables only work when the power is over
pins 1236 (signal pairs). I won't swear to it, but that's what I read.

Anyway, most PoE injectors (not all, but most) inject power on pins 4578
(non-signal pairs), meaning it won't work with things that need the power on
the signal pairs. For that, you'll need a switch that supports PoE.

For simple testing, Netgear has some cheap unmanaged switches that provide
PoE that's 802.11af-compliant. We're using a couple of them in really small
satellite offices, and they've been holding up pretty well. But I wouldn't
use them in a large-scale deployment, since they don't support VLAN
trunking, QoS, and what-not.


On 3/29/07, Eric ManxPower Wieling <eric at fnords.org> wrote:
>
> Noah Miller wrote:
> > Hi Mike -
> >
> >> I have a 501 with traditional power and a 301 with PoE. I rightfully
> >> assumed
> >> that the traditional power from the 501 would work on the 301.
> >>
> >>  How do I get the PoE to work? Do I use the Polycom PoE cable in
> >> addition to
> >> whatever PoE injection method I use? I have a Cisco PoE injector that
> >> works
> >> on my Cisco AP350 and my 7960. No combination of this injector, the
> >> Polycom
> >> cable, and the phone result in success.
> >>
> >>  I have 18v PoE injectors that I use for other things, but I hear that
> >> 802.3af is 48v, therefore probably wouldn't work.
> >>
> >>  How do I use Polycom PoE?
> >
> > You'll probably have to get different injectors, or a new PoE switch.
> > The newer Cisco PoE switches do speak 802.3af, but many of the older
> > Cisco PoE products do not.  The original Cisco PoE implementation was
> > proprietary and does not conform to 802.3af.
>
> Polycom has cables available to support Cisco PoE and 802.3af PoE.  They
> are, however, different cables.
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