Install DS1 CPE Loopback Jack (T1 Only)
Issue 5 October 2002
99
555-233-119
4. Enter test ds1-loop <location> cpe-loopback-jack. This turns on simplex
power to the loopback jack and waits about 20 seconds for any active DS1
facility alarms to clear. A “PASS” or “FAIL” appears on the terminal. This is
the first of the 2 results. A “FAIL” indicates a fault is present in the wiring
between the ICSU and the loopback jack. The loopback jack may also be
faulty. A “PASS” only indicates that the loopback jack looped successfully,
not that the test data contains no errors. If a “PASS” is obtained, continue
with the following steps.
NOTE:
The loss of signal (LOS) alarm (demand test #138) is not processed
during this test while the 3-in-24 pattern is active.
5. Enter clear meas ds1 loop <location> to clear the bit error count.
6. Enter clear meas ds1 log <location> to clear the performance
measurement counts.
7. Enter clear meas ds1 esf <location> to clear the ESF error count.
8. Enter list meas ds1 sum <location> to display the bit error count. See
Table 8
for troubleshooting information.
Table 8.
DS1 Span Troubleshooting
Field
Function
Indication
Test: cpe-
loopback-jack
Pattern 3-in-24
The loopback jack test is active.
Synchronized
Y or N
If “y” appears, the DS1 circuit pack has
synchronized to the looped 3-in-24 pattern and is
accumulating a count of the bit errors detected in
the pattern until the test has ended. If
n
appears,
retry the test 5 times by ending the test per Step
11 and re-starting the test per Step 4. If the circuit
pack never synchronizes, substantial bit errors in
the 3-in-24 pattern are likely. This could be
intermittent connections or a broken wire in a
receive or transmit pair in the CPE wiring.
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