Avaya Media Gateway G350, Maintenance Manual

Page: 110 / 332

Avaya Communication Manager controlled maintenance
DID-TRK (Direct Inward Dial Trunk)
110 Maintenance of the Avaya G350 Media Gateway
June 2004
DID-TRK (Direct Inward Dial Trunk)
Many trunk problems are caused by incorrect settings of parameters on the trunk group administration
form. Settings must be compatible with the local environment and with parameter settings on the far-end.
Refer to Administrator’s Guide for Avaya Communication Manager, 555-233-506, for information on
how to administer trunks. The Application Notes section of that book shows the correct settings for
administrable timers and other parameters on a country-by-country basis.
Direct Inward Dial trunks connect the switch to the CO, and allow outside parties to call directly to an
extension in the system. MM711 supports eight incoming-only ports.
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
Table 57, DID Trunk Error Log Entries, on page 111 for a description of
these errors. These errors may be 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.
Table 56: DID-TRK (Direct Inward Dial Trunk)
MO Name (in
Alarm Log)
Alarm Level Initial Command to Run* Full Name of MO
DID-TRK MAJOR** test port GGGVSpp l DID Trunk
DID-TRK MINOR test port GGGVSpp l DID Trunk
DID-TRK WARNING None DID Trunk
Note: You must consult local records for the location and designation of the equipment rack
where the G350 is mounted.
**
A MAJOR alarm on a trunk indicates that alarms on these trunks are not downgraded by the
set
options
command and that at least 75 percent of the trunks in this trunk group are alarmed.