Install DS1 CPE Loopback Jack (T1 Only)
Issue 5 October 2002
97
555-233-119
Loopback Jack Installation
Configurations Using a Smart Jack
The preferred location of the loopback jack is at the interface to the Smart Jack.
This provides maximum coverage of CPE wiring when remote tests are run using
the loopback jack. If the Smart Jack is not accessible, install the loopback jack at
the extended demarcation point.
1. If there is no extended demarcation point, install the loopback jack directly
at the network interface point as shown in
Figure 9 on page 103
.
2. If there is an extended demarcation point and the Smart Jack is not
accessible, install the loopback jack as shown in
Figure 10 on page 104
.
3. If there is an extended demarcation point, but the Smart Jack is accessible,
install the loopback jack as shown in
Figure 11 on page 105
.
Configurations Without a Smart Jack
1. Install the loopback jack at the point where the cabling from the ICSU plugs
into the “dumb” block. If there is more than one “dumb” block, choose the
one that is closest to the Interface Termination feed or the fiber MUX. This
provides maximum coverage for loopback jack tests. See
Figure 12 on
page 106
and
Figure 13 on page 107
.
Installation
1. To install the loopback jack, simply disconnect the RJ-48 (8-wide)
connector (typically an H600-383 cable) at the appropriate interface point
and connect the loopback jack in series with the DS1 span. See
Figure 9
on page 103
through
Figure 13 on page 107
.
2. Plug the H600-383 cable from the ICSU into the female connector on the
loopback jack.
3. Plug the male connector on the loopback jack cable into the network
interface point.
NOTE:
Do not remove the loopback jack after installation. This is not a test
tool and should always be available to remotely test a DS1 span.