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Loopback testing with a smart jack
Issue 4 October 2002
141555-233-116
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.
3. Once you are fairly certain that the test is reporting no errors (after at least
1 error-free minute), confirm that the 3-in-24 pattern error detector is
operating. Enter test ds1-loop UUCSS inject-single-bit-error, where UU
is the cabinet number, C is the carrier letter, and SS is the slot number of
the DS1 board.
4. Display the bit error count again. At the management terminal, enter list
meas ds1 sum UUCSS, where UU is the cabinet number, C is the carrier
letter, and SS is the slot number of the DS1 board.
5. End the test. Enter test ds1-loop location end cpe-loopback-jack-test.
6. Wait about 30 seconds for the DS1 to reframe on the incoming signal and
clear DS1 facility alarms.
Condition Solution
The value of the Bit-error count field is
greater than 1
Replace the ICSU, and retest.
The value of the Bit-error count field is still
greater than 1 after you replace the ICSU.
Replace the DS1 circuit pack, and retest.
The value of the Bit-error count field is 1 The test passed.
Condition Solution
Loopback termination fails with
an error code of 1313.
The span is still looped somewhere, possibly at the
loopback jack, at the ICSU, or somewhere in the
network.
The red LED on the loopback
jack is on.
Replace the ICSU, and re-run the test.
Loopback termination still fails. Replace the DS1 circuit pack, and repeat the test
The DS1 cannot frame on the
incoming span’s signal after
the loopback jack power down.
There is something wrong with the receive signal into
the loopback jack from the dumb block or the smart
jack.
The span failed the service
provider’s loopback test.
The problem is in the service provider’s network.