Using a new TN52TQX board in OSN6800(V100R004C00SPC510) during service expansion. TQX board place at slot 104.Then configure 4 channels ODU2 service from TQX board to TN53NS3，TQX board report BUS_ERR alarm.
TQX board report BUS_ERR alarm
1 Checking alarm, Only No.3 and No.4 of ODU2 channel report BUS_ERR, So, Exclude the hardware failure.
2 Checking the slot’s number which housing TQX， is slot 104，in normal situation，it Support 40G board.
3 Checking the version of XCS board， it is TN12XCS，support 40G slots.
4 Checking the version of backplane, it is TN1K1AFB，it does not support 40G slots.
The cause of BUS_ERR which reported by TQX.
1 The hardware failure.
2 The slot which place TQX does not support 40G board.
3 The XCS board does not support 40G slots.
4 The backplane does not support 40G slots.
OptiX OSN 6800 have 3 types of backplane at present. They are TN1K1AFB、TN1K2AFB、TN1K3AFB. And there are 2 kinds of XCS boards, TN11XCS and TN12XCS. Different combine of them,different limitation for 40G board. 1 For TN1K1AFB backplane,all the slots only have 8 pairs of cross-connection bus, they do not support 40G board. 2 If using TN11XCS board, all the slots also have 8 pairs of cross-connection bus which connecting to slot 9 and slot 10, they do not support 40G board neither. 3 If using TN12XCS+TN1K2AFB,support 4 *40G slots, they are slot 1,4,11,14.( TN1K3AFB has the same function of TN1K2AFB)