ADTRAN TSU 120, User Manual

Page: 102 / 143

Chapter 3. Operation
88
TSU 120 User Manual 61200.129L1-1
Run Selftest
This menu selection is used to execute a full internal
self test. The results of the self tests are displayed in
the LCD. Upon invoking the command the LCD
displays System Self-Test and the Test LEDs are
illuminated. Test failures are displayed in the LCD
window. The self test consists of the following steps:
1. Board level tests. Each of the TSU 120 boards
contain 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 Locked Loop verification.
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.
If a failure is detected, note the failure number prior to
contacting ADTRAN Technical Support.
The execution of Self Test disrupts normal data flow and
prevents remote communication until the Self Test is
completed.
Operation
Follow standard operating procedure to access the
4)TEST menu item.
With the cursor on 2)RUN SELFTEST, press Enter or
number 2. The unit runs through a changing display
in the LCD showing the test outcome.
Press Cancel to exit.