Avaya DEFINITY Server CSI Maintenance Manual page 101

Install DS1 CPE Loopback Jack (T1 Only)
11. Terminate the test by entering test ds1-loop <location> end
cpe-loopback-jack-test. Wait about 30 seconds for the DS1 to re-frame
on the incoming signal and clear DS1 facility alarms.
Loopback termination fails under the following conditions:
a. The span is still looped somewhere. This could be at the loopback
b. The DS1 cannot frame on the incoming span's signal after the
12. Restore the TX LBO field to the original value recorded in Step 2.
13. Release the DS1 circuit pack using the release board PCSSpp command.
14. Leave the loopback jack connected to the DS1 span.
Loopback Jack Fault Isolation Procedures
This section describes the possible DS1 configurations in which the loopback jack
may be used. These configurations are: when the DS1 provider includes a Smart
Jack, when no Smart Jack is provided at all, and when sites use fiber multiplexers.
Configurations Using a Smart Jack
The addition of the loopback jack and the presence of a Smart Jack divides the
DS1 span into 3 separate sections for fault isolation. These sections are shown in
Figure 9 on page 103
configurations. They are:
Section 1
Section 2
Section 3
555-233-119
jack, at the ICSU, or somewhere in the network. This state is
indicated by a fail code of 1313. If the red LED on the loopback jack
is on, replace the ICSU. Re-run the test and verify that the loopback
test terminates properly. If not, replace the DS1 circuit pack and
repeat the test.
loopback jack is powered down. This means that there is something
wrong with the receive signal into the loopback jack from the "dumb"
block or the Smart Jack. If the service provider successfully looped
and tested the span, up to the Smart Jack, this condition isolates the
problem to the wiring between the loopback jack and the Smart
Jack. See ''Loopback Jack Fault Isolation Procedures'' on page 101
for information on how to proceed in this case. The test cannot be
successfully terminated until a good signal is received. To properly
terminate the test before a good receive signal is available, enter
reset board <location>.
through Figure 11 on page 105
Between the 120A2 (or later) ICSU and the loopback jack.
Between the loopback jack and the Smart Jack (network
interface point).
From the Smart Jack to the CO. It is necessary to contact the
DS1 provider to run this test.
for the different span
Issue 5 October 2002
101