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Installation
2-93360-A2-GB20-20 December 1996
Power-Up Self-Test
After you connect the E1 NTU to a power source, the
unit performs the power-up self-test to ensure that it is in
good working order. The E1 NTU 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 NTU is plugged in, the In Progress
screen appears and the Fail LED blinks ON and
Off continuously.
F1
Self-Test:
In Progress
F2
F3
495-1474
7
OK
TEST SIG1 SIG2 OOF
NETWORK RXD
ALRM SIG ALRM PDVOOF BPV
FAIL
CTS RTSTXDDTR
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
495-1474
8
OK
TEST SIG1 SIG2 OOF
NETWORK RXD
ALRM SIG ALRM PDVOOF BPV
FAIL
DTR TXD CTS RTS
If the self-test fails, the Failed screen appears for
five seconds. The Fail LED lights, and an
eight-digit failure code (xxxxxxxx) is displayed for
use by service personnel to determine the cause of
the self-test failure. The E1 NTU 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
xxxxxxxx
F2
F3
495-1474
7
OK
TEST SIG1 SIG2 OOF
NETWORK RXD
ALRM SIG ALRM PDVOOF BPV
FAIL
CTS RTSTXDDTR
4. The top-level menu screen appears.
F1
E1 HDSL NTU
Stat Test Cnfig
F2
F3
495-1474
9
OK
TEST SIG1 SIG2 OOF
NETWORK RXD
ALRM SIG ALRM PDVOOF BPV
FAIL
DTR TXD CTS RTS