DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Additional Maintenance Procedures
6-14DS1 CPE Loopback Jack (T1 Only)
6
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
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.
b. The DS1 cannot frame on the incoming span’s signal after the
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. Refer to “Loopback Jack Fault Isolation
Procedures” 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>
.
12. Restore the “TX LBO” field to the original value recorded in Step 2.
13. Release the DS1 circuit pack using the
release board UUCCSSpp
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. These configurations are separated into “Configurations Using a
Smart Jack” and “Configurations Without a Smart Jack.”
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 6-1
through Figure 6-3 for the different span configurations. They are:
Section 1: Between the 120A2 (or later) ICSU and the loopback jack.
Section 2: Between the loopback jack and the Smart Jack (network interface
point).
Section 3: From the Smart Jack to the CO. It is necessary to contact the DS1
provider to run this test.
