Specifications

Chapter 7 Configuring the Eight-Port FXS RJ-21 Module
Fine-Tuning FXS Voice Ports
7-6
Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
Fine-Tuning FXS Voice Ports
Depending on the specifics of your particular network, you might need to
fine-tune the FXS voice port settings. Under most circumstances, the default
values will suffice; however, if you need to change them, use the following
commands in privileged EXEC mode.
Command Purpose
configure terminal
Enters global configuration mode.
voice-port slot_number/port
Identifies the voice slot and port number you want to
configure, and enters voice port configuration mode.
input gain value
Specifies (in decibels) the amount of gain to be inserted at
the receiver side of the interface. Acceptable values are
from –6 to 14.
output attenuation value
Specifies (in decibels) the amount of attenuation at the
transmit side of the interface. Acceptable values are from 0
to 14.
echo-cancel enable
Enables echo-cancellation of voice that is sent out through
the interface and received back on the same interface.
echo-cancel coverage value
Adjusts the size (in milliseconds) of the echo-cancel.
Acceptable value is 8.
impedance value
Specifies the impedance of the port.
The functional values are 600r (the default) and complex2
(an 820 ohm in series with (220 ohm | 120 nF)).
non-linear
Enables nonlinear processing, which shuts off any signal if
no near-end speech is detected. (Nonlinear processing is
used with echo-cancellation.)
timeouts initial seconds
Specifies the number of seconds that the system will wait
for the caller to enter the first digit of the digits to be dialed.
Valid entries are from 0 to 120.
timeouts interdigit seconds
Specifies the number of seconds the system will wait (after
the caller has entered the initial digit) for the caller to enter
a subsequent digit. Valid entries are from 0 to 120.