Instruction manual

Features
Considerations and Constraints
Incoming calls are received and processed normally on trunks in a
maintenance-busy state.
Any Direct Inward Dialing (DID) trunks in the Hybrid/PBX mode are not affected
by Automatic Maintenance Busy because these trunks can only receive calls
and are not pooled.
100D (DS1) modules configured as ground-start, loop-start, or tie trunks are
monitored and maintained by Automatic Maintenance Busy.
No more than 50% of the trunks in a trunk pool are allowed to be placed in the
maintenance-busy state at one time except when the central office has failed to
disconnect a trunk (preventing its use) or when an entire trunk module is
manually taken out of service (a “user-imposed” maintenance-busy state). In
the case of the 100D module, any failure in the DS1 link will cause the module to
generate a loss-of-service alarm, and the entire module will be taken out of
service.
Mode Differences
Hybrid/PBX Mode
To provide optimum performance, Automatic Maintenance Busy should be
enabled when a Hybrid/PBX system includes trunk pools.
Key and Behind Switch Modes
To provide optimum performance, Automatic Maintenance Busy is not available
in the Key and Behind Switch modes.
Feature Interactions
Alarm
The red LED next to the Alarm button on system operator
consoles goes on and the designated Maintenance Alarm alert
device sounds or flashes when more than 50% of the trunks in a
trunk pool are in a maintenance-busy state.
Automatic Route
When Automatic Route Selection (ARS) is used to make an
Selection outside call, the system does not select trunks that are in the
maintenance-busy state.
Automatic Maintenance Busy 45