Introduction; Setup For Diagnostic Loopback Tests; Diagnostics Methodology - Multitech MultiDSU MTT1DSU User Manual

Data service unit

Hide thumbs Also See for MultiDSU MTT1DSU:

Table of Contents

Introduction

MultiDSU diagnostics involve using the Diagnostics menus that are

accessible through option 4 on the Main Menu. Option 4 opens the

Diagnostics Menu that enables you to run loopback diagnostic tests on

the MultiDSU and its connecting lines.

Connect a T1 crossover cable between the LINE jacks on two

MultiDSUs. On the T1 Line Configuration menu, set up both units for the

identical framing format (option 1) and line coding (option 2). Use the

Clocking menu to set up one unit for Internal (option 1) (or External,

option 3, if your DTE is providing the 1.544 MHz clock), then set the

other unit for Line (option 2). Run the appropriate loopback tests from

the Diagnostics menu.

The methodology for all the loopback tests is as follows:

1 Connect the DTE device to the Data port of the local MultiDSU.

2 Put the MultiDSU (either the local or remote) into the desired test

mode.

3 Send data from the DTE device (local or remote).

4 Verify that the data received from the MultiDSU matches exactly

what was sent.

5 If the data received matches the data that was sent, then the test

passed. If the data received is corrupted or no data is received,

then the test failed. A failed test indicates a problem with either the

cables, connections, or one of the units involved in the test. If the

cause of the failure is not readily apparent, try using the process of

elimination to isolate the trouble spot(s). If there is still no clear

cause of the problem, follow the steps provided in Chapter 6 to

contact Tech support.

Table of Contents