The TDX board reports the BUS_ERR alarm when cross-connections are configured on the board because the service type of the board is not set.
Symptom
When the ODU2 cross-connections between the TDX and ND2 boards in the OptiX OSN 6800 on a network are configured, the boards report the BUS_ERR alarm.
Cause Analysis
This problem occurs when the input service type of the board is not set before cross-connections are configured on the board. The problem, however, does not affect the normal operation of the boards on the network.
Procedure
- Replace the TDX board to check whether it is faulty. The BUS_ERR alarm, however, persists after the board is replaced.
- Reseat the TDX board to check whether it is loose in its slot. The BUS_ERR alarm, however, persists after the board is reseated.
- Test the WDM-side signal rates of the TDX and ND2 boards. The test result shows that the WDM-side signal rate of the TDX board is 11.1 Gbit/s while that of the ND2 board is 10.7 Gbit/s. When the cross-connections between the TDX and ND2 boards are configured, the TDX board receives signals at a rate of 11.1 Gbit/s while the rate of the signals sent from the ND2 board is 10.7 Gbit/s. As a result, the boards report the BUS_ERR alarm. If the service type of the TDX board is set to STM-64, the TDX board receives signals at a rate of 11.1 Gbit/s and the problem is solved.
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