Cisco 4500M User Manual

30-4
Software Configuration Guide—Release 12.2(25)EW
OL-6696-01
Chapter 30 Configuring Voice Interfaces
Configuring Inline Power
To override the CoS priority setting received from the non-voice port on the Cisco 7960 IP phone,
perform this task:
Configuring Inline Power
The Catalyst 4500 series switch senses if it is connected to a Cisco 7960 IP phone. The Catalyst 4500
series switch can supply inline power to the Cisco 7960 IP phone if there is no power on the circuit. The
Cisco 7960 IP phone can also be connected to an AC power source and supply its own power to the voice
circuit. If there is power on the circuit, the switch does not supply it.
You can configure the switch not to supply power to the Cisco 7960 IP phone and to disable the detection
mechanism. See the “Enter the show power command to display the current power redundancy and the
current system power usage.” section on page 7-15 for the CLI commands that you can use to supply
inline power to a Cisco 7960 IP phone.
Command Purpose
Step 1
Switch# configure terminal
Enters configuration mode.
Step 2
Switch(config)# interface {fastethernet |
gigabitethernet}
slot / port
Specifies the interface to configure.
Step 3
Switch(config-if)# [no] qos trust extend cos 3
Sets the phone port to override the priority received from
the PC or the attached device and forward the received data
with a priority of 3.
Use the no keyword to return the port to its default setting.
Step 4
Switch(config-if)# end
Returns to privileged EXEC mode.
Step 5
Switch# show interface {fastethernet |
gigabitethernet}
slot/port switchport
Verifies the change.

Cisco 4500M Specifications

General

Brand	Cisco
Model	4500M
Category	Network Router
Language	English