566 / TestsModular ICS 7.1 Installer Guide N0130943 02TestsNorstar allows you to run tests which verify the integrity of theinstallation wiring for the telephones.In addition, you can evaluate the transmission quality of a BRIloop through your service provider using a loopback test toevaluate different aspects and segments of the T1 digitaltransmission path. You can only run one loopback test at atime on any one DTI.Loopback tests for T1 or ISDN-PRI linesInstaller password requiredThe following messages may appear on the Alarm Telephoneduring Loopback tests.Choose an appropriate time to run tests.Do not run the loopback tests while ports arebeing disabled or during the first two minutesafter Startup programming. If you do, the testsmay stop running with ports still disabled. Torecover from this, unplug the ICS from the poweroutlet, then plug it in again.The loopback tests disrupt service. Do not runtests during busy user times.Message ExplanationEVT: 210-YYYZ Loopback test YYY on TrunkCartridge Z has startedEVT: 211-YYYZ Loopback test YYY on TrunkCartridge Z has ended
