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Chapter 2. Installation
2-6 TSU User Manual 61200060L1-1
POWER UP TESTING AND INITIALIZATION
When shipped from the factory, the TSU is uninitialized and
set to factory default conditions. At the first application of
power, the unit will automatically execute self tests followed
by an initialization sequence which sets up the unit.
Self Test
Upon a power-up or commanded self tests the LCD displays
ADTRAN TSU INITIALIZING
and the LEDs illuminate
sequentially. When the self test is completed with no failures
detected, the LCD will momentarily display
ALL TESTS
PASSED
. If a failure is detected it is displayed in the LCD
window. The automatic self test procedure consists of the
following tests.
1. Board level tests.
•RAMtests;EPROMchecksum
• On board data path. Sending a known test pattern
throughanonboardloop.
2. Unit level tests.
• Front Panel LED verification
• Phase Lock Loop verify