[Asterisk-Users] Polycom 501 power over ethernet

Douglas Garstang dgarstang at oneeighty.com
Mon Mar 6 08:13:22 MST 2006 

No, some IP 501's have the inline cable and some have the power jack.

-----Original Message-----
From: Paul Hales [mailto:pdhales at optusnet.com.au]
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:mike at telecommatters.net] 
> 	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 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.
> 	>>> To the Point
> 	>>> 345 California Avenue Suite 2
> 	>>> Palo Alto, CA 94306
> 	>>>    vox:  650.327.2175 (direct)
> 	>>>    fax:  650.329.8335
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> 	>>> e-mail:  mailto:bill at tothept.com
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> 	>>
> 	>> --Michael Welter
> 	>> Telecom Matters Corp.
> 	>> Denver, Colorado US
> 	>> +1.303.414.4980
> 	>> mike at TelecomMatters.net
> 	>> 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:bill at tothept.com
> 	>    web:  http://www.tothept.com
> 	>
> 	> _______________________________________________
> 	> --Bandwidth and Colocation provided by Easynews.com --
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> 	> Asterisk-Users mailing list
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> 	>
> 	>
> 	
> 	--
> 	Michael Welter
> 	Telecom Matters Corp.
> 	Denver, Colorado US
> 	+1.303.414.4980
> 	mike at TelecomMatters.net
> 	www.TelecomMatters.net
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> 
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