Command Description
RLBK L Closes the loop at the carrier interface point of the PRI so the far end can
perform an external loopback test. PRI loop L
must be disabled because
the test disrupts call processing.
DLBK L Disables the remote loopback test per RLBK L. The loop remains
disabled.
DLBK L CH Disables the remote loopback test per RLBK L CH. The channel remains
disabled.
RLBK L CH Per RLBK L, but performed on channel CH. This channel must be
disabled prior to issuing the request.
RMST L Performs self-test on loop L, providing the far end is in the remote
loopback mode.
RMST L CH Performs self-test on channel CH, providing the far end is in the remote
loopback mode.
PRI tests
PRI self-test
The self-test checks speech-path continuity
, zero-code suppression, and remote-alarm
detection. This test is performed manually on a per-channel or a per-frame basis.
The DCHI and PRI must be disabled before performing the self-test, or call processing will be
disrupted. To perform the self-test on a specific loop, follow
PRI self-test on page 43.
PRI self-test
1. Disable the DCHI using:
LD 96
DIS DCH N
2. Disable the PRI loop and run the self-test using:
LD 60
DISL L
SLFT L
PRI tests
ISDN Primary Rate Interface Maintenance November 2011 43
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