HDSL4 for General Distribution Installation and Maintenance Practice HDSL NEW ENHANCED FEATURE OVERVIEW61223HDSL4L2-5C B-9Using the Bad Splice DetectorA brief synopsis of steps that might be utilized on a trouble analysis are as follows:1. Check the HDSL units for margin fluctuation by checking the Min & Max margins on theDetailed Span Status screen (differ by > 6 dB) corresponding to the time of the trouble.2. Check for recorded errors (ES, SES, UAS) and/or loss of sync (LOS) in PerformanceHistory data that also correspond to the time of the reported trouble.3. Check that the copper pairs pass specifications using appropriate test equipment.If copper pairs pass all tests, re-install the HDSL units. After they achievesynchronization, clear the PM and Alarm histories from the main menu.4. Go to the Chronic Circuit menu and reset the splice detector. (It is recommended that thesplice detector be reset after a circuit is installed to avoid inaccurate results due to oldsplice-detect data left in the non-volatile memory).5. Leave the circuit operating for a few hours or days (depending on severity of problem) andthen re-check.6. Go to Splice Detector Results Screen and see if any indicated trouble is reported.7. If a problem splice has been detected, re-splicing the closest splices to the indicatedtrouble (±275 feet for HDSL-2 and ±550 feet for HDSL-4) is recommended.NOTEIn general, the shorter the distance, the more accurate the mea-surement.8. If no trouble is reported on the Splice Detection Results Screen, go to the Histogramscreen and check for anomalies that have been detected. The anomaly can exist but maynot have reached the threshold level to report it to the Splice Detection Results Screen.Any non-zero counter numbers on this screen may correspond to a deteriorating splicepoint that should be investigated.NOTEIf a cable pair acceptance test verified the cable pairs at turn up,and the Splice Detector was reset at that time, then the trouble-shooting procedure would include step 1 and step 2, then proceedimmediately with step 7 on the first trouble call.
