Adjuncts and Peripherals
DS1/T1 CPE loopback jack
822
SI Installation and Upgrades
June 2004
Testing the DS1 span from the loopback jack
to the smart jack
Test the short length of customer premises wiring between the loopback jack and the smart jack (Section
2 in the following 3 figures) using a loopback that overlaps this section of the span.
•
Have the DS1 service provider at the CO end run a local ICSU line loopback test.
•
Have the DS1 service provider at the CO end run a local DS1 payload loopback test.
•
Run a far-end ICSU line loopback, using the procedure below.
NOTE:
This test cannot isolate the problem if there are problems in the wiring between the far-end
CO and the far-end ICSU. You must coordinate this test with the DS1 service provider.
1
From the management terminal, enter
test ds1-loop location
.
2
Examine the bit-error counts, as in
Testing the integrity of data sent over the loop
on page
819."
3
Terminate the test. Enter
test ds1-loop location end-loopback/span-test
.
3
If the tests fails and the there were no problems
Testing the DS1 span from the ICSU to the
loopback jack
or
Testing the DS1 span from the smart jack to the network interface termination or
fiber multiplexer (MUX)
, there is a problem between the loopback jack to the smart jack. Work
with the service provider to isolate the fault.
Figure 315: Network interface at smart jack for a 120A2 (or later) ICSU
Figure notes
1
Span section 1
2
Span section 2
3
Span section 3
4
120A2 (or later) ICSU
5
RJ-48 to network interface (up to 1000 ft. [305 m])
6
Loopback jack
7
Network interface smart jack
8
Interface termination or fiber
multiplexer (MUX)
9
Central office
