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 terminati on fails under the following cond itions:
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 b y a fail code of 1313. If the red LED on the loopb ack
jack is on, replace the ICSU. Re-run the test and veri fy that the
loopback test termina tes 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 jac k is powered down. This means that there is
something wrong with the receive sig nal into the loopback jac k from
the “dumb” block or the Smart Jack. If the servic e provider
successfully looped and tested the span, up to the Smart Jack, this
condition isolates the prob lem to the wiring between the loop back
jack and the Smart Jack. Refer to “Loop back Jack Fault Isolation
Procedures” for information on how to p roceed in this case. The test
cannot be succ essfully terminated until a good signal is received.
To properly terminate the test before a good rec eive signal is
available, enter reset board <location>.
12. Restore the “TX LBO” field to the original value rec orded in Step 2.
13. Release the DS1 circuit pack using the release board UUCCSSpp
command.
14. Leave the loopback jac k connected to the DS1 span.
Loopback Jack Fault Isolation Procedures
This section describes the possible DS1 configurations in whic h the loopback
jack may be used. These co nfigurations are: when the DS1 provider includ es a
Smart Jack, when no Smart Jack is provid ed at all, and when sites use fiber
multiplexers. These configurations are sep arated into “Configurations Usin g a
Smart Jack” and “Confi gurations Without a Smart Jack.”
Configurations Using a Smart Jack
The addition of the loopbac k jack and the presenc e of a Smart Jack divides the
DS1 span into 3 separate sections for fault isolati on. These sections are shown in
Figure 6-1 through Figure 6-3 for the different span confi gurations. They are:
Section 1: Between the 120A2 (or later) ICSU and the loopb ack jack.
Section 2: Between the loopbac k jack and the Smart Jack (network interfac e
point).
Section 3: From the Smart Jack to the CO. It is necessary to c ontact the DS1
provider to run this test.