Weed Eater 2600 Configuring Echo Adjustment, Configuring Voice Level Adjustment, Command, Purpose

Cisco High-Density Analog Voice and Fax Network Module

Configuration Tasks

Configuring Echo Adjustment

By design, echo cancellers are limited by the total amount of time they wait for the reflected speech to be received, which is known as an echo trail. The echo trail is normally 32 milliseconds. In Cisco System voice implementations, echo cancellers are enabled using the echo-cancel enable command, and echo trails are configured using the echo-cancel coverage command.

To configure parameters related to the echo canceller, use the following commands beginning in voice-port configuration mode:

	Command	Purpose
Step 1
	Router(config-voiceport)# echo-cancel enable	Enables the cancellation of voice that is sent and
		received on the same interface. Echo cancellation
		coverage must also be configured. The default is
		that echo cancellation is enabled.
Step 2
	Router(config-voiceport)# echo-cancel coverage {8 16	Adjusts the echo canceller by the specified number
	24 32}	of milliseconds. The default is 16.
Step 3
	Router(config-voiceport)# non-linear	Enables nonlinear processing (residual echo
		suppression) in the echo canceller, which shuts off
		any signal if no near-end speech is detected. Echo
		cancelling must be enabled for this feature. The
		default is that nonlinear processing is enabled.

Configuring Voice Level Adjustment

Use the input gain and output attenuation commands to adjust voice levels, and the impedance command to set the impedance value to match that of the voice circuit to which the voice port connects.

To change parameters related to voice levels, use the following commands as appropriate, in voice-port configuration mode:

	Command	Purpose
Step 1
	Router(config-voiceport)# input gain value	Specifies, in decibels, the amount of gain to be
		inserted at the receiver side of the interface,
		increasing or decreasing the signal. After an input
		gain setting is changed, the voice call must be
		disconnected and reestablished before the changes
		take effect. The value argument is any integer from
		–6 to 14. The default is 0.

Cisco IOS Release 12.2(2)XT and 12.2(8)T

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