AT&T MERLIN LEGEND Installation & Maintenance Manual page 519

Maintenance and Troubleshooting
The CO fails to disconnect when the GS Iine/trunk is
dropped by the system.
After two occurrences, the line/trunk is put into a
maintenance-busy state and a permanent error is !ogged.
No loop current is detected when the GS line/trunk is
seized.
The port is marked maintenance busy and a permanent
error is logged.
Loop-Start Line/Trunk
No loop current exists when the LS Iine/trunk is seized.
The port is marked maintenance busy and a permanent
error is logged.
Tie Trunk
A seizure of an outgoing tie trunk fails.
A transient error is reported. After four unsuccessful
seizure attempts, the port is marked maintenance busy
and the error becomes permanent.
The far-end station fails to disconnect.
A transient error is reported. Atfer two occurrences, the
port is marked maintenance-busy and the error becomes
permanent.
Note: The test is not run on auto-out tie trunks.
Maintenance-Busy Programming
You can select automatic maintenance busy as a system
programming option.
include tie trunks.
If you do, there is also a menu selection to
Maintenance 5-41