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Bit Error Rate Tester (BERT) 4-1
Chapter 4
Troubleshooting and
Diagnostics
This chapter contains procedures for performing system diagnostic tests for
ASM-20. Use the test procedures provided in this chapter to:
• Verify normal system operation
• Isolate faulty equipment in the event of failure.
Tests are activated by control push buttons on the ASM-20 front panel and
monitored via LED indicators. For a description of the ASM-20 controls and
indicators and their functions, see Chapter 3, Operation.
4.1 Loop Test Procedure
The test switches and LED indicators built into ASM-20 allow rapid checking of the
data terminals, ASM-20 and lines. Use the test procedures provided in this chapter
to check normal system operation and isolate faulty equipment in the event of
failure. Each test verifies the operational performance of a unit in the system or
provides a positive indication of equipment failure.
Before testing operation of the data system equipment and line circuits, ensure
that all units are turned on and correctly configured.
4.2 Bit Error Rate Tester (BERT)
The Bit Error Rate Tester (BERT) can be activated in any diagnostics test in which
the test pattern transmitted is looped back to the BERT for comparison (see
Figure 4-1).