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. > >>>>> _______________________________________________ > >>>>> --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 > >>>> > >>>> _______________________________________________ > >>>> --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:[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 > >> _______________________________________________ > >> --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:[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 > _______________________________________________ > --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 > > > _______________________________________________ > --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 _______________________________________________ --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
