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Loopback testing with a smart jack
Issue 4 October 2002
139555-233-116
1. At the management terminal, enter test ds1-loop UUCSS cpe-loopback-
jack, where UU is the cabinet number, C is the carrier letter, and SS is the
slot number of the DS1 board.
The loopback jack powers up. Active, DS1 facility alarms (if any) clear.
After about 20 seconds, the first set of results appears on the terminal.
2. If FAIL appears on the terminal display, there may be a fault in the wiring
between the ICSU and the loopback jack or the loopback jack may itself be
faulty. Isolate the problem by replacing the loopback jack and repeating
Step 1.
3. If FAIL still appears after the loopback jack has been replaced, suspect a
wiring problem. Replace the cable between the ICSU and the loopback
jack. Then repeat Step 1.
4. When PASS appears on the terminal, proceed with the second part of the
test, checking the integrity of transmitted data.
Testing the integrity of data sent over the loop
Now perform the second part of the test, checking for data errors.
NOTE:
The loss of signal (LOS) alarm (demand test #138) is not processed
during this test while the 3-in-24 pattern is active.
Clearing the results of previous tests
NOTE:
If you have a G700 Media Gateway, substitute XXXVS for UUCSS in the
following commands, where XXX is the administered number of the G700
(for example, 002), and VS is the slot number on the G700 of the Media
Module (for example, V3). The V is not a variable and needs to be included
in the commands exactly where shown. A sample address for a DS1 circuit
pack on a G700 Media Gateway might look like this: 002V3.
1. Zero out the bit-error counter. At the management terminal, enter clear
meas ds1 loop UUCSS, where UU is the cabinet number, C is the carrier
letter, and SS is the slot number of the DS1 board.
2. Zero out the performance measurement counter. At the management
terminal, enter clear meas ds1 log UUCSS, where UU is the cabinet
number, C is the carrier letter, and SS is the slot number of the DS1 board.
3. Zero out the ESF error count. At the management terminal, enter clear
meas ds1 esf UUCSS, where UU is the cabinet number, C is the carrier
letter, and SS is the slot number of the DS1 board.