ADTRAN TSU 600 - Manual (Page 45)

Chapter 2. Installation
61200.076L2-1 TSU 600 User Manual
33
POWER UP TESTING AND INITIALIZATION
When shipped from the factory, the TSU 600 is set to
factory default conditions. At the first application of
power, the unit automatically executes a memory self
test. A full self test can be run from the front panel,
and a pass code and unit ID may be set using the UTIL
menu.
Self Test
Upon a power-up, the LCD displays Memory Test
Now Testing
and the Test LEDs are illuminated.
When the self test is completed with no failures
detected, the OK LED lights up and the LCD momen-
tarily displays All Tests Passed. If a failure is de-
tected, a list of failures is displayed in the LCD win-
dow. The full self test procedure (invoked from the
front panel or T-Watch) consists of the following steps:
1. Board level tests. Each of the TSU 600
boards contains an on board processor
which executes a series of tests checking the
circuitry on the board.
a. RAM tests; EPROM checksum.
b. DS0 map tests.
c. On board data path. Sending a known test
pattern through an on board loop.
2. Unit level tests.
a.
Front panel LED verification.
b. Phase lock loop verify.
c.
Board-to-board interface test. A test pattern is
sent from the controller through a loopback on
all other boards and checked on the controller.
This verifies the data path, clocks, and control
signals.