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6-5

Cisco Catalyst 4000 Access Gateway Module Installation and Configuration Note

OL-3008-01

Chapter 6 Configuring the 8-Port and 16-Port FXS RJ-21 Modules

Fine-Tuning FXS Voice Ports

For complete information about configuration commands and about configuring LAN and WAN

interfaces on your switch, refer to the Cisco IOS configuration guides and command references.

The following example shows how to use the fine-tune FXS commands:

gateway# conf t

Enter configuration commands, one per line. End with CNTL/Z.

gateway(config)#voice-port 4/0

gateway(config-voiceport)#input gain 10

gateway(config-voiceport)#output attenuation 10

gateway(config-voiceport)#echo-cancel enable

gateway(config-voiceport)#echo-cancel coverage 8

gateway(config-voiceport)#non-linear

gateway(config-voiceport)#timeouts initial 10

gateway(config-voiceport)#timeouts interdigit 10

gateway(config-voiceport)#timing digit 60

gateway(config-voiceport)#timing inter-digit 60

To display the values configured, use the show running-config command, as follows:

gateway# sh running-config

voice-port 4/0

input gain 10

output attenuation 10

echo-cancel coverage 8

timeouts initial 10

timeouts interdigits 10

timing digit 60

timing inter-digit 60

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

values are 16, 24, and 32.

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.

timing digit milliseconds If the voice port dial type is

dual tone multifrequency (DTMF),

configure the duration (in milliseconds) of the DTMF digit signal.

The range of the duration is from 50 to 100; the default is 100.

timing inter-digit milliseconds If the voice port dial type is DTMF, configure the duration (in

milliseconds) of the DTMF interdigit signal. The range of the

duration is from 50 to 500; the default is 100.

Command Purpose (continued)

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