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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>>>>
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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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>> Asterisk-Users mailing list
>> To UNSUBSCRIBE or update options visit:
>> http://lists.digium.com/mailman/listinfo/asterisk-users
>
> 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
>
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
>
> Asterisk-Users mailing list
> To UNSUBSCRIBE or update options visit:
> http://lists.digium.com/mailman/listinfo/asterisk-users
>
>
--
Michael Welter
Telecom Matters Corp.
Denver, Colorado US
+1.303.414.4980
[EMAIL PROTECTED]
www.TelecomMatters.net
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