User`s guide

6-1
7800-A2-GB26-80
May 1999
Performing Loopback Modes and
Pattern Tests
6
Overview
Loopback modes and pattern tests check the integrity and performance of
network devices and, to some extent, the network itself. This chapter describes
how to:
H Isolate device problems
H Use loopback modes
H Use pattern tests
H Run tests
Isolating Device Problems
There are several ways that you are notified of problems with a device, and
several methods you can use to resolve it. The following sections offer
information that you can use to both diagnose and manage problems that you
encounter.
H Determining the Type of Problems
H Diagnosing Problems with Management Links
H Diagnosing Problems with Device or Line