Avaya DEFINITY Server CSI, Руководство по обслуживанию, Страница: 108 / 1930

Maintenance for CSI systems
555-233-119 108
Issue 5 October 2002
A problem can exist in 1 or both of the 2 sections. The field technician is
responsible for finding and correcting problems in section 1 and the loopback
cable portion of section 2. The DS1 service provider is responsible for finding and
correcting problems in the majority of section 2. Testing is divided into 2 steps.
1. Test customer premises wiring (section 1 in Figure 12 on page 106 ) from
the ICSU to the loopback jack as described in the “DS1 Span Test” section.
2. Test the loopback jack-to-”dumb” block and ”dumb” block-to-CO wiring
(section 2 in Figure 12 on page 106 ). This can be done using a loopback
that “overlaps” the section of the span. 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 the “DS1 Span Test” section. 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. This could mean
bad loopback jack -to-”dumb” block cabling, but is more likely to indicate a
problem somewhere between the “dumb” block and the CO. This is the
responsibility of the DS1 service provider. If the DS1 Span Test confirms that there
are no problems in section 1, the technician should proceed as follows to avoid
unnecessary dispatch.
1. Identify and contact the DS1 service provider
2. Inform the DS1 provider that loopback tests of the CPE wiring to the
“dumb” block (section 1) showed no problems
3. If the far-end ICSU line loopback test failed, inform the DS1 provider
4. Request that the DS1 provider perform a loopback test of their portion of
the section 2 wiring by sending someone out to loop section 2 back to the
CO at the “dumb” block.
5. If this test fails, the problem is in the service provider’s wiring.
6. If the test passes, the problem is in the cable between the loopback jack
and the “dumb” block. Replace the loopback jack.