Automatic Maintenance Busy - AT&T MERLIN LEGEND System Reference Manual

Features

Automatic Maintenance Busy

Description
Mode Differences
Hybrid/PBX
Key and Behind Switch
When Automatic Maintenance Busy is enabled, a malfunctioning loop-start
line/trunk, ground-start line/trunk or tie trunk is automatically put in a
maintenance-busy state, preventing outside calls from being made on that
line/trunk (incoming calls are never blocked).
In general, there are two reasons an outside facility is put in a maintenance-busy
state:
Faulty or delayed signaling between the system and the central office. To
avoid busying out lines/trunks because of slow telephone company central
office responses rather than faulty lines/trunks, four consecutive occurrences
of faulty or delayed signaling are required before the line/trunk is put in the
maintenance-busy state.
Central office failure to disconnect (make the line/trunk available for use)
after the user has hung up. The line/trunk is put in the maintenance-busy
state after two occurrences of a failure to disconnect.
When a line/trunk is put in the maintenance-busy state, an error is recorded on
the internal error log. The log indicates which type of error occurred-faulty or
delayed signaling, or central office failure to disconnect.
Once a line/runk is in the maintenance-busy state, there are three ways to clear
the condition and put the line/trunk back into service:
Periodic testing of the line/trunk by the system's internal maintenance
software to verify proper functioning.
Manual clearing of the error from the error log.
Manual seizure of the line/trunk at the system operator console or via
maintenance dial codes.
To provide optimum performance, Automatic Maintenance Busy should be
enabled when a Hybrid/PBX system includes trunk pools.
In the Key and Behind Switch modes, the feature is disabled.
Automatic Maintenance Busy 2-39