-----Original Message-----
From: Douglas Garstang [mailto:[EMAIL PROTECTED]
Sent: Monday, March 06, 2006 10:13 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: RE: [Asterisk-Users] Polycom 501 power over ethernet
No, some IP 501's have the inline cable and some have the power
jack.
-----Original Message-----
From: Paul Hales [mailto:[EMAIL PROTECTED]
Sent: Sunday, March 05, 2006 8:59 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: RE: [Asterisk-Users] Polycom 501 power over ethernet
The IP300/301 has the power jack, the IP500/501 the inline cable.
PaulH
On Sun, 2006-03-05 at 20:56 -0700, Douglas Garstang wrote:
Not true. Some do and some don't. Some have a place to plug
a separate DC adapter, and some have the inline power, where the
adapter plugs into the ethernet cable. Not sure which ones are
newer,
and which are older.
-----Original Message-----
From: Michael Welter [mailto:[EMAIL PROTECTED]
Sent: Sun 3/5/2006 6:50 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Cc:
Subject: Re: [Asterisk-Users] Polycom 501 power over ethernet
The IP501 does not have a power jack. You'll need one
of the Polycom
cables.
William M Conlon wrote:
My recollection of the marketing fluff was that we
would just use our
legacy network (cables) and the devices at both ends
would figure out
whether they were sourcing, sinking, or neither. In
the case of the
501, it's the special Polycom cable, either with or
without provision
for an AC power adapter, that powers the phone.
That's what I meant by
saying the '501' itself is not compliant with 802.3af
-- it needs a
separate thingamajig [tech jargon :)]to be powered.
Anyway I had hoped that I could just plug a CAT-5
patch cable from my
RJ45 wall outlet into the phone.
On Mar 5, 2006, at 5:17 PM, Michael Welter wrote:
As I understand 802.3af, the phones go through a
negotiation with the
unit supplying the power. I don't think it's a
matter of -48VDC on a
particular pair. I remember a schematic from years
ago--it had each
of the receive pair and the transmit pair going into
a transformer
winding, and that winding had a center tap for PoE.
This is not
something that *I* am going to screw with.
The IP501 telephone set is the same for both PoE and
local power.
With the PoE cable, the 802.3af electronics (the
negotiator) is a
plastic thing in the cable. For the local power,
there is a plastic
thingie toward the wall end of the cable, and you
plug the wall wart
into the plastic thingie. <Notice the advanced
technical jargon here>
With local power, there is still only one cable one
the desk--the
power plugs into the cable towards the wall. Except
for a power
interruption, this has all the advantages of PoE.
William M Conlon wrote:
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 [EMAIL PROTECTED])
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.
To the Point
345 California Avenue Suite 2
Palo Alto, CA 94306
vox: 650.327.2175 (direct)
fax: 650.329.8335
mobile: 650.906.9929
e-mail: mailto:[EMAIL PROTECTED]
web: http://www.tothept.com
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--Michael Welter
Telecom Matters Corp.
Denver, Colorado US
+1.303.414.4980
[EMAIL PROTECTED] www.TelecomMatters.net
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Bill
William M. Conlon, P.E., Ph.D.
To the Point
345 California Avenue Suite 2
Palo Alto, CA 94306
vox: 650.327.2175 (direct)
fax: 650.329.8335
mobile: 650.906.9929
e-mail: mailto:[EMAIL PROTECTED]
web: http://www.tothept.com
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--
Michael Welter
Telecom Matters Corp.
Denver, Colorado US
+1.303.414.4980
[EMAIL PROTECTED] www.TelecomMatters.net
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