When a customer does OSN3500 cross-master-standby reversal test, after reversing the cross board to No. 9 ssn1uxcsa as the primary at site 134, the 8-N3SL16-1 single board 1/2/3/4 channels at this site report HP-RDI, and at the same time, the 7-N3SL16-1 single board at the downstream 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.

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

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, below the following optp command, whether it is correct. If it is correct, then carry out the cross-master-standby inversion test.
:optp:8,0,9b,1,30,08,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
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 spare board for anomalies such as pin reversal. Replace another piece of cross try.
3, If both 1 and 2 cannot solve the problem, please replace the subrack.
The engineer finally troubleshoots the problem by replacing the N3SL16A veneer board.

As the line veneer for the N3SL16A veneer, a single bus rate of 622M, 1/2/3/4 channel is exactly the first bus, so the suspicion is that 134 network elements on the first bus failure of the 9 slot cross board to the 8 SL16 veneer, or veneer chip failure caused by the failure of the bus connection with the 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 //Entering the test state
:optp:8,0 ,9b,1,1a,61,9,10,14 //Read the first system side bus alarm of the 8-slot overhead chip
:optp:8,0,9b,1,30,08,e7,e7,e7,e7,a5,a5,a5,a5//Exit test state
: alm-set-monevent:8,TEST_STATUS,0,0,0,enable;
2. The result of the run is 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
It is found that there are alarms present, the alarms are LOF and OOF. and the first bus is the connected cross board #9.

When the OSN3500 line veneer detects the buses from the crossover board, it will only report T_LOSEX or TR_LOC if it receives LOS or LOC.
If the line veneer receives an error code on the system bus, it will not report the alarm.