Installation
2-9
3170-A2-GB20-20
December 1996
Power-Up Self-Test
After you connect the E1 DSU/CSU to a power source,
the unit performs the power-up self-test to ensure that it is
in good working order. The E1 DSU/CSU performs this
test on itself upon power-up or after a device reset unless
it has been disabled by the Self-Test configuration option
(see Appendix C, Configuration Options).
The self-test includes a basic processor test, a limited
memory test, a code checksum test, and basic verification
tests of the internal components. The front panel LCD
displays the progress and pass/fail status of these
power-up tests.
The power-up self-test consists of the following steps:
1. Once the E1 DSU/CSU is plugged in, the In
Progress screen appears and the Fail LED blinks
ON and Off continuously.
F1
Self-Test:
In Progress
F2
F3
2. All the LEDs then start to flash simultaneously in
the pattern twice ON, then Off. Then, the LCD
begins to flash characters and numbers in the same
pattern, alternating with the flashing LEDs.
3. If the self-test is successful, the Passed screen
appears for one second, the Fail LED turns Off
and the OK LED lights.
F1
Self-Test:
Passed
F2
F3
If the self-test fails, the Failed screen appears for
five seconds. The Fail LED lights, and an
eight-digit failure code (nnnnnnnn) is displayed
for use by service personnel to determine the
cause of the self-test failure. The E1 DSU/CSU
continues to try to operate. If you are in doubt
about the results of the self-test, use the Self-Test
Health command to display the status of this test
(see the Self-Test Health section in Chapter 4,
Maintenance).
F1
Self-Test:
Failed
nnnnnnnn
F2
F3
4. The top-level menu screen appears.
F1
DSU E1 CEPT
Stat
Test
Cnfig
F2
F3
