Avaya DEFINITY Server CSI, Руководство по обслуживанию, Страница: 102 / 1930

Maintenance for CSI systems
555-233-119 102
Issue 5 October 2002
A problem can exist in 1 or more of the 3 sections. The field technician is
responsible for finding and correcting problems in the first 2 sections. The DS1
service provider is responsible for finding and correcting problems in the third
section. Testing is divided into 3 steps.
1. Test customer premises wiring (section 1 in the following 3 figures) from the
ICSU to the loopback jack as described in “DS1 Span Test.”
2. Test the CO-to-network interface wiring (section 3 in Figure 9 on page 103 )
using the Smart Jack loopback (CO responsibility). Coordinate this test
with the DS1 provider.
3. Test the short length of customer premises wiring (section 2 in the following
3 figures) between the loopback jack and the Smart Jack. This can be done
using a loopback that “overlaps” section 2 of the cable. Any of the following
loopbacks can do this:
■
The local ICSUs line loopback, which is typically activated, tested, and then
deactivated by the DS1 service provider at the CO end.
■
The local DS1 interface’s payload loopback, activated and tested by the
DS1 service provider at the CO end.
■
The far-end ICSU’s line loopback. This test is activated at the management
terminal by entering test ds1-loop <location>
far-csu-loopback-test-begin. The test is terminated by entering test
ds1-loop <location> end-loopback/span-test. Bit error counts are
examined as described in “DS1 Span Test.” This test method is the least
preferable because it covers wiring that is not in the local portion of the
span. This test only isolates problems to section 2 wiring if there are no
problems in the wiring between the far-end CO and the far-end ICSU.
Coordinate this test with the DS1 service provider.
If any of the above tests fail, a problem is indicated in section 2 as long as
the tests for section 1 and section 3 pass. Since section 2 includes the
network interface point, it is necessary to work with the service provider to
isolate the fault to the loopback jack cable, the “dumb” block, or the Smart
Jack.