[Asterisk-Users] Polycom 501 power over ethernet

Ken D'Ambrosio ken at jots.org
Mon Mar 6 14:25:17 MST 2006 

On Mon, March 6, 2006 4:19 pm, pdhales at optusnet.com.au wrote:
> I have installed several hundred polycom's, and I have never seen a
> 500/501
> with a power jack. All with the inline cable, as you mention.
>
> Of course, if someone can provide photo evidence I will stand corrected.

I think the confusion here is the different *ways* the 300/500/600 do PoE:

301 has a power brick, just like (say) a Grandstream.
501 has _almost_ PoE: the cable is (as noted above) in-line, but this
might confuse someone differentiating with the 301.
601 has "true" PoE, where you've got your PoE switch, a stock Ethernet
cable, and the phone -- nothing else, and no special cabling required.

-Ken (purveyor of fine differentiations)

>
> PaulH
>
>
> ----- Original Message -----
> From: "The VoIP Connection" <asterisk-biz at thevoipconnection.com>
> To: "'Asterisk Users Mailing List - Non-Commercial Discussion'"
> <asterisk-users at lists.digium.com>
> Sent: Tuesday, March 07, 2006 4:26 AM
> Subject: RE: [Asterisk-Users] Polycom 501 power over ethernet
>
>
>
>> I've seen a lot of IP501 and I've never seen one with a power jack.
>> According to Polycom they all use the cable.
>>
>>
>> Possibly it was an IP500? -Mike
>>
>>
>> Michael Crown
>> Managing Partner
>> www.thevoipconnection.com 321.989.6728 ext. 611
>> sip:611 at voiceserver.thevoipconnection.com
>>
>>
>>> -----Original Message-----
>>> From: Douglas Garstang [mailto:dgarstang at oneeighty.com]
>>> 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: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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>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Asterisk-Users mailing list
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>>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> --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
>>>>>>>>
>>>>>>> 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 --
>>>>>>> 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
>>>>>> _______________________________________________
>>>>>> --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
>>>>>>
>>>>>
>>>>> 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 --
>>>>>
>>>>>
>>>>> 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
>>>> mike at TelecomMatters.net www.TelecomMatters.net
>>>> _______________________________________________
>>>> --Bandwidth and Colocation provided by Easynews.com --
>>>>
>>>>
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>>>>
>>>>
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>>>
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>>
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