Pri Self-Test; Pri Automatic Loop Test - Nortel Meridian Meridian 1 Feature Description And Administration

6 Remove the loopback plug from the J4 connector.
7 Replace cable connector to the PRI J4 (removed in step 3).
8 Enable the loop:
LD 60
ENLL loop
9 Enable the DCH:
LD 96
ENL DCH x

PRI self-test

The self-test checks speech path continuity, zero code suppression, remote
alarm detection, and A&B bit signaling. This test is performed manually, on
a per channel or a per frame (24 channels) basis.
The DCH and PRI must be disabled before performing the self-test or call
processing is disrupted. To perform the self-test on a specific loop:
1 Disable DCH:
LD 96
DIS DCH x
2 Disable the PRI loop and run the self-test:
LD60
DISL loop
SLFT loop
When the system returns OK, it indicates that the hardware is operable.
3 Re-enable the PRI loop:
LD 60
ENLL loop
The D-channel will re-enable automatically.

PRI automatic loop test

The automatic loop test checks the same functions as the self-test. Unlike the
self-test, it can be run automatically, as part of the midnight routines.
International ISDN PRI Feature description and administration
Service verification Page 1801 of 1814