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336 Installation, Upgrades and Additions for Avaya CMC1 Media Gateways
Figure 106: Network interface at “dumb” block with repeater line to fiber MUX for a 120A2
(or later) ICSU
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 105
and Figure 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 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.
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])
5. Loopback jack
6. Dumb block (demarcation point)
7. Repeater
8. Fiber multiplexer (MUX)
9. Central office