AT&T System 85 - Manual (Page 126)

CHAPTER 8. TROUBLESHOOTING PROCEDURES FOR VOICE TERMINALS
If the system does not have the remote maintenance option, the ACK light is off when the
ALM light goes on for an alarm. You must notify the System Manager whenever an alarm
condition exists.
Maintenance Features
The following features can be used by the console attendant or, sometimes, by a voice
terminal user with a display-equipped voice terminal for simple trouble isolation and analysis.
Step-by-step procedures are provided for each feature.
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Automatic Circuit Assurance—used for monitoring possible trunk failures.
Busy Verification of Lines—used for making test calls.
Trunk identification—used to specifically identify a trunk where trouble is
encountered.
Trunk Group Busy/Warning Indicators—used to show trunk usage.
If the display shows a faulty line, trunk, circuit pack, or other equipment, when you are using
the procedures, notify the System Manager.
Automatic Circuit Assurance (ACA)
This feature assists you in identifying possible trunk malfunctions. The system maintains a
record of the performance of individual trunks relative to short- and long-holding time calls.
The system automatically initiates a referral call when a possible failure is detected. The
attendant group, an individual attendant, or a voice terminal user can be assigned as the
referral call destination.
A referral call arrives on an idle call appearance. When you press the call appearance
button, the display identifies the call as an ACA call, identifies the trunk group access code
and the trunk group member number, and shows the reason for referral (short- or long-
holding time). This information remains displayed until you release the call. You can then
use the Busy Verification of Lines feature to check the trunk.
The ACA feature provides better service through early detection of faulty trunks and
consequently reduces out-of-service time. Some types of trunk failures cause people to
shorten their calls. For example, an excessive number of short calls may indicate a noisy
trunk. Similarly, a trunk that remains busy for an abnormally long time may be permanently
busy because of a trunk fault. The ACA feature takes advantage of these characteristics to
identify trunks that may be defective.
The System Manager enables ACA. Once this is done, one attendant console or voice
terminal per system can be assigned an ACA button to activate or cancel ACA referrals.
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