Lucent Technologies DEFINITY Installation For Adjuncts And Peripherals page 147

DEFINITY ECS Release 8.2
Installation for Adjuncts and Peripherals 555-233-116
9 DS1/T1 CPE Loopback Jack
Loopback Testing Without a Smart Jack
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
Figure 38. Network Interface at "Dumb" Block with Repeater Line to Fiber MUX
You are responsible for finding and correcting problems in the customer wiring
(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.
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
"overlaps" the section of the span. Any of the following loopbacks can do
this:
Figure 37). This can be done using a loopback that
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.
6. Dumb block (demarcation point)
7. Repeater
8. Fiber multiplexer (MUX)
9. Central office
Issue 1
April 2000
125