Lucent Technologies MERLIN LEGEND Release 6.1 Maintenance And Troubleshooting Manual page 252

MERLIN LEGEND Communications System Release 6.1
Maintenance and Troubleshooting 555-661-140
Trunk Errors
Permanent Errors
A permanent error is entered in the error logs when more than 50 percent of
analog trunks in a pool are maintenance-busy. When the maintenance-busy
level falls below 50 percent, the system automatically removes the permanent
error.
NOTE:
Make sure that modules are not in a maintenance-busy state during a
backup procedure. Any module in a maintenance-busy state is recorded
as such on the backup disk.
Maintenance-Busy Causes
The causes of maintenance-busy vary according to the type of trunk and are
detailed in the following sections.
Ground-Start (GS) Trunks
The following events cause maintenance-busy on a ground-start trunk:
A seizure of the trunk is attempted that results in incomplete
handshaking (or no loop current) between the central office (CO) and
the system.
After four occurrences, the trunk is put into a maintenance-busy state
and a permanent error is logged.
The CO fails to disconnect when the GS trunk is dropped by the system.
After two occurrences, the trunk is put into a maintenance-busy state
and a permanent error is logged.
Loop-Start (LS) Trunks
No loop current exists when the LS trunk is seized. The port is marked
maintenance-busy , and a permanent error is logged after four occurrences.
Tie Trunks
The following events cause maintenance-busy on a tie trunk:
Issue 1
August 1998
Page 5-6