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Chapter 15: 56/64-kbps Switched and Digital Data Services (DDS) Interface

August 1997 Page 15-1

2524UM

Chapter 15: 56/64-kbps Switched and

Digital Data Services (DDS) Interface

Configuration Steps

Introduction

This chapter describes how to configure 2- and 4-wire 56/64 kbps ser-

vice modules. These tasks are described:

Set the Clock Source

Set the Network Line Speed

Enable Scrambled Data Coding

Change Between DDS 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. Fo

back-to-back configurations, use the

internal

keyword to config-

ure one CSU/DSU and use the

line

keyword to configure the othe

CSU/DSU.

Configure the clock source for a 4-wire 56/64-kbps CSU/DSU mod-

ule:

service-module 56k clock source {line |

internal}

Do not use any form of this command to revert to the default clock

source, which is the line clock.

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