On Sat, 28 Aug 2004, Michael Welter wrote: > Greg Boehnlein wrote: > > On Sat, 28 Aug 2004, Michael Welter wrote: > > > > > >>Since the Cisco 79XX phones preceded the PoE standard, they are > >>different--polarity is reversed. > >> > >>IANAE, but as I understand the PoE devices, there are two types--one > >>always applies -48VDC to the brown pair while the other senses (as per > >>the PoE spec.) whether the device at the other end requires power. > >> > >>I'm not willing to risk a $300 Cisco set, so I'm still using the wall > >>wart. Is anyone providing LAN power to 79XX phones at a reasonable cost? > > > > > > Please see: > > > > http://www.voip-info.org/wiki-Cisco+POE > > > > I am using 3Com POE injectors (the Dumb kind) with Cisco 7960s without a > > problem. You need a special cable that you can build or, you can buy a > > PowerDSine POE injector and get the following (part PD-PS-401-5/CSCS) > > which will do the same thing as the cable. > > > > To add to my confusion, the wiki page you referenced says the 7960g > phones are different from the original 7960.
Not in terms of POE. No 7960 supports the 802.3af POE protocol and instead uses a proprietary Cisco protocol. The cable that is referenced on those pages reverses the polarity of the wires, which with a dumb power injector like the 3com will allow you to use the Cisco. However, if you get a regular 802.3af injector, that actually speaks and respects the protocol, it STILL won't work with a Cisco. I use the following dumb injector with my Cisco cable; http://www.3com.com/prod/en_UK_EMEA/detail.jsp?tab=features&sku=3CNJPSE It works. -- Vice President of N2Net, a New Age Consulting Service, Inc. Company http://www.n2net.net Where everything clicks into place! KP-216-121-ST _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
