Description of the problem

When a customer performs a cross-master-standby reversal test for Huawei OSN3500 equipment, after reversing the cross board to No. 9 ssn1uxcsa as the master at site 134, channel 1/2/3/4 of the 8-N3SL16-1 single board at this site reports HP-RDI, and at the same time, downstream site 7-N3SL16-1 single board at site 132 reports AU-AIS, and the service is interrupted. The device version is 5.21.17.12. the customer is re-inverted back to the 10th service is resumed.

Alarm information

Minor HP_RDI 134 Kaka 8-N3SL16-1(SDH-1)-VC4:4 28-05-2012 04:03:23 28-05-2012 06:02:51

Major AU_AIS 132 Babadurmaz 7-N3SL16-1(SDH-1)-VC4:1 28-05-2012 04:03:22 28-05-2012 04:05:11

Major AU_AIS 132 Babadurmaz 7-N3SL16-1(SDH-1)-VC4:2 28-05-2012 04:03:22 28-05-2012 04:05:14

Major AU_AIS 132 Babadurmaz 7-N3SL16-1(SDH-1)-VC4:3 28-05-2012 04:03:22 28-05-2012 04:05:14

Major AU_AIS 132 Babadurmaz 7-N3SL16-1(SDH-1)-VC4:4 28-05-2012 04:03:22 28-05-2012 06:02:51

Processing

1, replace the line 8 single board, at the same time detect the spare board whether there is backward pin and other abnormalities. Wait for the single board to start, the following following optp command, whether it is correct. If it is correct, then carry out the cross-primary backup inversion test.

:optp:8,0,9b,1,30,08,c6,c6,c6,c6,3c,3c,3c

:optp:8,0,9b,1,1a,61,9,10,14

:optp:8,0,9b,1,30,08,e7,e7,e7,a5,a5,a5,a5

The correct situation is as follows:

:optp:8,0,9b,1,1a,61,9,10,34

Optp cmd : 1a61

00 00

2. Test the No. 9 single board backup board for abnormalities such as pin reversal. Replace another piece of cross try.

3、If 1 and 2 can not troubleshoot, please replace the subframe.

The engineer finally troubleshoots the problem by replacing the N3SL16A veneer.

Root Cause

As the line veneer is N3SL16A veneer, the single bus count rate is 622M, and the 1/2/3/4 channel is exactly the first bus, so it is suspected that on the 134 network elements, the first bus from the No. 9 slot cross board to the No. 8 SL16 veneer is faulty or the veneer chip is faulty resulting in a faulty bus connection with the No. 9 veneer.

1. Run the following optp command to read the alarm on the detection system side of the No. 8 line single board

:alm-set-monevent:8,TEST_STATUS,0,0,0,disable.

:optp:8,0,9b,1,30,08,c6,c6,c6,c6,3c,3c,3c //enter the test state

:optp:8,0,9b,1,1a,61,9,10,14 //Read the first system-side bus alarm of 8-slot overhead chip

:optp:8,0,9b,1,30,08,e7,e7,e7,a5,a5,a5 //Exit test state

: alm-set-monevent:8,TEST_STATUS,0,0,0,enable;

2. Run the result as follows:

#9-134:szhw [134 Kaka ][][2012-06-05 17:17:22+05:00]>

:optp:8,0,9b,1,1a,61,9,10,14

Optp cmd : 1a61

00 60

Total records :1

Alarms were found to exist for LOF and OOF, and the first bus is the connected cross-over board #9.

Recommendations and Summary

The line veneer detects the bus sent from the cross-over board and only reports T_LOSEX or TR_LOC if it receives LOS or LOC.

If the line board receives an error code on the system bus, it will not report an alarm.

The technical information related to this chapter and the SDH equipment troubleshooting process are collected and organized by Shenzhen Optical Transmission Network Technology Co. Our company specializes in the sale of Huawei SDH optical transmission equipment,SDH transmission equipment.