Avaya MCC1 Installation And Upgrades page 826

Adjuncts and Peripherals
DS1/T1 CPE loopback jack
Figure 319: Network interface at "dumb" block with repeater line to fiber MUX for a 120A2
(or later) ICSU
Figure notes
1 Span section 1
2 Span section 2
3 120A2 (or later) ICSU
4 RJ-48 to network interface (up to 1000 ft.
[305 m])
Proceed as follows.
1
Test customer premises wiring 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 319). This can be done using a loopback that "overlaps" the section of the span. Any of the
following loopbacks can do this:
•
The local ICSU's line loopback, which the DS1 service provider at the CO end typically
activates, tests, and then deactivates.
•
The local DS1 interface's payload loopback, which the DS1 service provider at the CO
end activates and tests.
•
The far-end ICSU's line loopback. Activate this test at the management terminal by
entering test ds1-loop location far-csu-loopback-test-begin, where location is
the DS1 interface circuit pack corresponding to the loopback jack. Terminate this test by
entering test ds1-loop location end-loopback/span-test, where location is the
DS1 interface circuit pack corresponding to the loopback jack.
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.
826
5 Loopback jack
6 Dumb block (demarcation point)
7 Repeater
8 Fiber multiplexer (MUX)
9 Central office
SI Installation and Upgrades
Figure 318 and
June 2004