Did Trunk Operation; Did Trunk Testing; Ports Out-Of-Service Without Errors Or Alarms - Avaya G700 Maintenance Manual

6 Avaya MultiVantage Software-Controlled Maintenance:

DID Trunk Operation

The DID port receives three to five digits from the CO that are used to directly connect an outside
caller to the called station without assistance from an attendant. For each call, the CO switch signals
the system by opening and closing individual DID loops (one of the eight ports), causing the starting
or stopping of loop current.

DID Trunk Testing

The system uses technician-invoked tests to diagnose the health of the trunk. These tests are described
in the following sections. Additionally, in-line testing which can generate errors, is performed while a
call is in progress. See the Error Log
reproduced by placing a call on the trunk and checking the Hardware Error Log.
Problems detected during signaling may be caused by off-board faults in the CO switch or
connections for which a Warning alarm is raised.
Before a maintenance test can be run on a port, the port must be idle. If an incoming call seizes a port
that is being tested, the test will abort and the incoming call will proceed.
For transmission and signaling standard specification, refer to Digital PBX Standards, RS4648.

Ports Out-of-Service without Errors or Alarms

A common trouble on DID trunks that produces no errors or alarms occurs when the CO busies out
(disconnects) the port. This situation occurs when the CO thinks there are problems with the DID
port. In this case, no incoming calls will be possible through this port. This may result in complaints
from outside callers trying unsuccessfully to call in. This problem can be diagnosed by listing
measurements on lightly used trunks. If a particular port is detected as not in use, a call to the CO will
be necessary to get the connection back in service.
138
Table 13 for a description of these errors. These errors may be
Maintenance for S8300/S8700 and G700
555-234-101 — Issue 2 — October 2002
DID-TRK (Direct Inward Dial Trunk)