Specifications

xvi
Cisco 1751 Router Software Configuration Guide
OL-1070-01
Usage Guidelines
Use the echo-cancel coverage command to adjust the coverage size of the echo canceller. This
command enables cancellation of voice that is sent out of the interface and received back on the same
interface within the configured amount of time. If the local loop (the distance from the analog interface
to the connected equipment producing the echo) is longer, the configured value of this command should
be extended.
If you configure a longer value for this command, the echo canceller takes longer to converge; in this
case, the user might hear a slight echo when the connection is initially set up. If the configured value
for this command is too short, the user might hear some echo for the duration of the call because the
echo canceller is not cancelling the longer delay echoes.
There is no echo or echo cancellation on the IP side of the connection.
Note This command is valid only if the echo cancel feature has been enabled. For more
information, refer to the echo-cancel enable command.
Example
The following example adjusts the size of the echo canceller to 16 ms:
voice port 0/0
echo-cancel enable
echo-cancel coverage 16
Related Commands
echo-cancel enable
echo-cancel enable
To enable the echo cancel feature, use the echo-cancel enable voice-port configuration command. Use
the no form of this command to disable this feature.
echo-cancel enable
no echo-cancel enable
Syntax Description
This command has no arguments or keywords.
Default
Enabled for all interface types.
Command Mode
Voice-port configuration.