[cisco-voip] PoE Question

[Robert Kulagowski]

Jason Burton wrote:
> Does anyone have a link on Cisco's web site that will explain the power 
> budgeting for PoE on their switches.  Basically I'm looking for proof 
> that it's either possible or not to have phones plugged into every port 
> on a switch and not cause any problems with power.  I've heard both that 
> you can't use all the ports and that you can, so I need the definitive 
> answer.

You can use all the ports on a 48 port PoE switch (we have 3750's) with 
7970's if you limit the power.

interface FastEthernet1/0/1
  power inline consumption 6700

Sets it to a max of 6.7watts, which on the 7970 means that the display 
is half brightness.  Our users never saw full brightness on their 
phones, and we limit the power on 24 port switches as well (so that 
there aren't complaints of "his phone is brighter than mine!").

We're running;
# sh ver
Cisco IOS Software, C3750 Software (C3750-IPBASEK9-M), Version 
12.2(25)SED, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Sat 22-Oct-05 12:43 by yenanh
Image text-base: 0x00003000, data-base: 0x00F43C70

I think this was the first release that supported the power inline 
consumption command.