ADTRAN TSU LT User Manual download pdf (Page 21)

TSU LT 220V User Manual Chapter 2 Inspection and Installation

In addition to the specified self-tests, background tests are run on various parts of the internal electronics.

These run during normal operation to confirm continued correct functioning. The background tests include

the following:

• Monitoring the phase locked loop for lock.

• Standard background network performance monitoring.

The self-test works as follows:

The automatic self-test consists of the following tests:

• Board-level tests

• Random access memory (RAM) tests; erasable programmable read-only memory (EPROM) checksum

• On-board data path (sending a known test pattern through an on-board loop)

• Unit-level tests

• Front panel LED verification

• Phase lock loop verification

If... Then...

a power-up (or commanded) self-test occurs the LCD displays ADTRAN TSU INITIALIZING and the LEDs

illuminate sequentially.

the self-test completes with no failures detected the LCD momentarily displays ALL TESTS PASSED.

a failure is detected it is displayed in the LCD window.

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ADTRAN TSU LT User Manual Page 21