ADTRAN 25 manual Trunk Troubles, Outgoing Trunk Problems

MAINTENANCE

Trunk Troubles

Many trunk troubles originate in the central office (CO) facilities. The first step in identifying trunk troubles should be to check for presence of dial tone at the Trunk Access Equipment (TAE). If required, check the Error Log records, and make a trunk test call.

Note that it is sometimes difficult for the user to detect or identify trunk troubles. If an outgoing trunk is down, an error is recorded in the error log and the trunk is taken out of service (see Note ). If an incoming-only trunk is down, however, the only indication of trouble is customer complaints that incoming calls are not being received.

Note: For Release 1, Version 2 or Release 3 systems, the system will not busy out more than half of the trunks in any pool. Thus, a permanent alarm may be logged against a particular

. trunk, but the trunk may not be taken out of service because of this constraint.

Other troubles could occur because of incorrect loop current. The loop current of trunks from the CO to System 25 should be 20 mA.

Outgoing Trunk Problems

Symptoms:

Difficulty in seizing outgoing trunks.

P r o c e d u r e s :

1.Verify that dial tone is received from the CO at the TAE (see Note). If dial tone is not present, notify the CO through the proper channels.

N o t e : For ground-start trunks, apply ground to the Ring lead to get dial tone.

2.Go off-hook at a test station to get system dial tone.

3.Dial *2 (the test code for all non-DID facility trunks).

4.Dial the 4-digit trunk number of the trunk to be tested. (This is the same number used by the System Administrator to identify this trunk.)

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