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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 13 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.
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