Loopback Jack Installation - Avaya MCC1 Maintenance Procedures

Additional maintenance procedures
DS1 CPE loopback jack (T1 only)
NOTE:
The loopback jack operates with any vintage of TN767E (or later) or TN464F (or later)
DS1 circuit packs. The loopback jack operates with the 120A2 (or later) ICSU only; not
the 31xx series of Channel Service Units (CSUs), other external CSUs, or earlier ICSUs.

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
2 If there is an extended demarcation point and the smart jack is not accessible, install the loopback
jack as shown in
inaccessible), on page
3 If there is an extended demarcation point, but the smart jack is accessible, install the loopback
jack as shown in
accessible), on page
Configurations without a Smart Jack
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
at "Dumb" Block, on page 364
Fiber MUX, on page
Installation
To install the loopback jack:
1 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
Network Interface at Smart Jack, on page 361
Block with repeater line to Fiber MUX, on page
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.
356
Figure 107, Network Interface at Smart Jack, on page
Figure 108, Network Interface at Extended Demarcation Point (Smart Jack
362.
Figure 109, Network Interface at Extended Demarcation Point (Smart Jack
363.
and Figure 111, Network Interface at "Dumb" Block with repeater line to
365.
Figure 110, Network Interface
through Figure 111, Network Interface at "Dumb"
365.
Maintenance Procedures
361.
Figure 107,
December 2003