Title Page

Contents

About This Document

General Model and Methods of Fault Locating

General Flow

Emergency Handling Flow

Abnormal State of a Service Processing Board

Troubleshooting Service Interruptions

Troubleshooting Transient Service Interruptions

Troubleshooting Bit Errors

Troubleshooting Pointer Justification

Troubleshooting Protection Switching Faults

Troubleshooting the NEs Being Unreachable

Troubleshooting Orderwire Faults

Troubleshooting Service Packet Loss

Troubleshooting Device Interconnection Faults

Remote Maintenance Guide

Glossary

Acronyms and Abbreviations