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How to Handle A_LOC reported by OSN 3500

Publication Date:  2012-07-24 Views:  35 Downloads:  0
Issue Description
There was A_LOC alarm appeared on the 6th port of PD3 board,due to which the E3 service was down .Two other E3's configured on the same PD3 board were working normal .
Alarm Information
A_LOC (Loss of clock) alarm was reported which is major alarm and by monitoring the performance it was obsserved there were some errors E3_LCV_SDH (Line code violation ) in quite large number E3_LES_SDH,E3_LSES_SDH .
392086      15    A_LOC                 MJ          start       2007-9-24 4:13:53    None                                                                  0x01   0x00   0x06   0xff   0xff   
:per-get-curdata:15,0,0,0,perall,15m;
 15   15m   2007-9-24 4:45:0     e3_lcv_sdh           1       6             84933870 
  15    15m    2007-9-24 4:45:0     e3_les_sdh          1       1             649         
  15    15m     2007-9-24 4:45:0     e3_les_sdh          1       4             649       
  15    15m     2007-9-24 4:45:0     e3_lses_sdh       1       1             649          
Handling Process
We make a local loop at site where the alarm was reported,towards other vendor equipment and they were not getting local loop as well.After that the cusotmer  patching patching was removed from DDF and it was observed that A_LOC alarm was disappeared .Than we make the Hard loop  towards system side again the A_LOC alarm was disappeared and there was no alarm no the trail as well.So after that patching was redone by the customer end ,alarm was cleared and E3 service was up .
Root Cause
The alarm was reported due to the patching issue of E3 at DDF on customer end.
Suggestions
Issues like Patching and grounding are  vital so we need to pay attention to them.

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