Hi, Am Donnerstag, den 06.12.2007, 11:30 -0500 schrieb Jon Pounder: > Quoting Ricardo Carvalho <[EMAIL PROTECTED]>: > > > I only see one explanation to my problem... > > > > GXP2000 phones only implement PoE mode A of the IEEE 802.3af protocol, and > > the power injector does only PoE mode B of the IEEE 802.3af protocol. The > > switch does mode A. > > The problem is that I can't prove this! can't find documentation with this > > kind of detail. If someone does, please tell. > > > what is the difference between the modes - is it just the pins used ?
Mode A means "inline power". The 48 V is transferred over the wire-pairs 1/2 and 3/6 which are also used for data transfer. Before the power is switched on, endpoint and power supply must negotiate this process. Mode B means "midspan power". The 48 V is transferred over the wire-pairs 4/5 and 7/8, which are unused and 10/100 networks. Mode B is not possible on GigE (afaik). Regards, Karsten _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
