Specifications

Serial Interface Configuration Examples

IC-126

Cisco IOS Interface Configuration Guide

2- and 4-wire, 56/64-kpbs Service Module Examples

Examples for 2- and 4-wire, 56/64 kpbs service modules are provided for the following

conﬁgurations:

• Set the Network Line Speed Examples

• Enable Scrambled Data Coding Example

• Enable Switched Dial-Up Mode Example

• Display a Performance Report Example

• Remote Loopback Request Example

• Select a Service Provider Example

Set the Network Line Speed Examples

The following interactive example displays two routers connected in back-to-back DDS mode.

However, the conﬁguration fails because the auto rate is used.

Router1# service-module 56k clock source internal

Router1# service-module 56k clock rate 38.4

Router2# service-module 56k clock rate auto

% WARNING - auto rate will not work in back-to-back DDS.

a1# ping 10.1.1.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

Router2# service-module 56k clock rate 38.4

Router1# ping 10.1.1.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 52/54/56 ms

When transferring from DDS mode to switched mode, you must set the correct clock rate, as shown

in the following example:

Router2# service-module 56k network-type dds

Router2# service-module 56k clock rate 38.4

Router2# service-module 56k network-type switched

% Have to use 56k or auto clock rate for switched mode

% Service module configuration command failed: WRONG FORMAT.

Router2# service-module 56k clock rate auto

% WARNING - auto rate will not work in back-to-back DDS.

Router2# service-module 56k network-type switched