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TSU LT User Manual
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:
If...
a power-up (or commanded) self-test occurs
the self-test completes with no failures detected
a failure is detected
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
61203060L1-1A
Then...
the LCD displays ADTRAN TSU INITIALIZING and the LEDs
illuminate sequentially.
the LCD momentarily displays ALL TESTS PASSED.
it is displayed in the LCD window.
© 2003 ADTRAN, Inc.
Chapter 2 Inspection and Installation
25
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