[Asterisk-Users] Polycom 501 power over ethernet
Paul Hales
pdhales at optusnet.com.au
Sun Mar 5 20:59:04 MST 2006
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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> >>>>>
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> >>>>
> >>>> _______________________________________________
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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:bill at tothept.com
> >>> web: http://www.tothept.com
> >>> _______________________________________________
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> >>> 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 --
> >>
> >> 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 --
>
> Asterisk-Users mailing list
> To UNSUBSCRIBE or update options visit:
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>
>
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