Instruction manual

Features

Automatic Maintenance Busy

At a Glance

Users Affected Telephone users, operators

Reports Affected

System Information

Mode

Hybrid/PBX

System Programming

System → MaintenBusy

Description

When Automatic Maintenance Busy is enabled, a malfunctioning loop-start,

ground-start, or tie trunk is automatically put in a maintenance-busy state,

preventing outside calls from being made on that trunk. Incoming calls are

never blocked.

In general, the two reasons for putting an outside trunk in a maintenance-busy

state

■

When

are as follows:

Faulty or delayed signaling between the system and the central office.

To avoid busying out trunks because of slow telephone company central

office responses rather than faulty trunks, four consecutive occurrences

of faulty or delayed signaling are required before the trunk is put in the

maintenance-busy state.

Central office failure to disconnect (make the trunk available for use) after

the user has hung up. The trunk is put in the maintenance-busy state

after two occurrences of a failure to disconnect.

a 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 trunk is in the maintenance-busy state, the three ways to clear the

condition and put the trunk back into service are as follows:

■ Periodic testing of the 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 trunk at the system operator console or via

maintenance dial codes

Automatic Maintenance Busy