Specifications

Configure Serial Interfaces for CSU/DSU Service Modules
IC-108
Cisco IOS Interface Configuration Guide
To configure the router to send SNMP traps, use the following commands:
2-Wire and 4-Wire, 56/64-kbps CSU/DSU Service Module Configuration
Task List
To configure 2- and 4-wire, 56/64 kbps service modules, perform the tasks described in these
sections:
• Set the Clock Source
• Set the Network Line Speed
• Enable Scrambled Data Coding
• Change between Digital Data Service and Switched Dial-Up Modes
• Enable Acceptance of a Remote Loopback Request
• Select a Service Provider
Set the Clock Source
In most applications, the CSU/DSU should be configured with the service-module 56k clock
source line command. For back-to-back configurations, use the internal keyword to configure one
CSU/DSU and use the line keyword to configure the other CSU/DSU.
To configure the clock source for a 4-wire, 56/64-kbps CSU/DSU module, use the following
command for a serial interface in interface configuration mode:
Use the no form of this command to revert to the default clock source, which is the line clock.
Set the Network Line Speed
To configure the network line speed for a 4-wire, 56/64-kbps CSU/DSU module, use the following
command for a serial interface in interface configuration mode:
Step Command Purpose
interface serial slot/port
(slot/port corresponds to where the
WIC card is installed in your router)
Enter interface configuration mode.
service-module t1 fdl {ansi | att} Set the fdl parameter to either ansi or att.
<Ctrl-z> Exit interface configuration mode.
more system:running-config Verify that the fdl parameter has been changed.
Command Purpose
service-module 56k clock source {line |
internal}
Configure the clock source.
Command Purpose
service-module 56k clock rate speed Set the network line speed.