Lucent Technologies MERLIN LEGEND Release 5.0 Maintenance And Troubleshooting Manual page 236

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting 555-650-140
Central Office Problems
Trunk Errors
No more than 50 percent of trunks in a pool can be in maintenance-busy states
at one time. The only exceptions are as follows:
User-imposed maintenance-busy (for example, module replacement)
Module maintenance-busy (for example, a loss-of-service alarm in the
100D module)
No external release at the central office end of the line
Digital Trunks
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) Trunk
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.
Issue 1
June 1997
Page 5-6