Lucent Technologies MERLIN LEGEND Release 6.1 Maintenance And Troubleshooting Manual page 251

MERLIN LEGEND Communications System Release 6.1
Maintenance and Troubleshooting 555-661-140
Trunk Errors
Testing Trunks Automatically
The automatic maintenance program takes the ports out of service when a trunk
is malfunctioning. When a port is out of service, it is maintenance-busy . The
trunk is periodically tested and put back into service if possible.
Maintenance-Busy Status
When maintenance-busy is enabled and a trunk cannot be seized for an
outgoing call, the trunk is automatically put into a maintenance-busy state.
When a trunk is in a maintenance-busy state, no outgoing calls can be placed
on it. However, the trunk can still receive incoming calls.
NOTE:
Maintenance-busy does not apply to DID trunks, since DID trunks cannot
be used to make outgoing calls.
While the trunk is in a maintenance-busy state, the software periodically runs
tests, attempting to seize the trunk:
If the seizure is unsuccessful, the trunk stays in a maintenance-busy
state.
If the seizure is successful, the trunk is placed back in service.
If a test is running when an incoming call is received on the trunk, the
test is dropped and the call is processed.
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
Issue 1
August 1998
Page 5-5