Routine Maintenance Procedures
555-233-123
5-26 Issue 4 May 2002
See DEFINITY Communications System Generic 1 and Generic 3 — Console
Operations, 555-230-700, and DEFINITY Communications System Generic 1 and
Generic 3 Voice Terminal Operations for detailed operating procedures (does not
include Facility Test Calls, Analog Tie Trunk Back-to-Back Testing, Terminating
Trunk Transmission Testing, Troubleshooting ISDN-PRI Problems,
Troubleshooting ISDN-PRI Test Calls, or Troubleshooting ISDN-BRI Problems
described in this chapter.)
Automatic Circuit Assurance
Requires a display-equipped voice terminal (may be nondisplay type if the Voice
Message Retrieval feature is provided) or an attendant console. An "ACA
activate/deactivate" button (one per system) is required on the voice terminal or
attendant console.
Automatic Circuit Assurance (ACA) assists users 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 to an attendant console or display-equipped voice terminal
when a possible failure is detected.
Holding time is the elapsed time from when a trunk is accessed to the time a trunk
is released. When ACA is enabled via administration, the system measures the
holding time of each call.
A short holding time limit and a long holding time limit are preset by the system
manager for each trunk group. The short holding time limit can be from 0 to 160
seconds. The long holding time limit can be from 0 to 10 hours. The measured
holding time for each call is compared to the preset limits for the trunk group being
used.
Measurements are not made on personal CO lines, out-of-service trunks, or
trunks undergoing maintenance testing.
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