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Only Partial Ports on the N1SLQ4 Board Are Available Due to Bus Wiring Restriction of the Cross-Connect Board

Publication Date:  2012-07-25 Views:  44 Downloads:  0
Issue Description
A certain office houses the OptiX OSN 3500 on which the NE software is of version 5.21.18.50 and the cross-connect board is SSN1SXCSA. After the SSN1SLQ4 boards are installed in slots 4 and 15, only the former two optical interfaces of the boards are available.
Alarm Information
Null
Handling Process

1  .     The cross-connect board on the OptiX OSN 3500 is SSN1SXCSA. The service access capacities of slots 5 and 14 are both 5 Gbit/s, and the total rate of the SSN1SLQ4 boards are 2.5 Gbit/s. Therefore, the service access capacity is adequate.

2  .    The installation slot of a board depends on the service access capacity, and on the bus wiring restriction of the cross-connect board and the N1SLQ4 board. The SSN1GXCSA, SSN1EXCSA, and SSN1UXCSA/B boards on the OptiX OSN 3500 support the 622 Mbit/s bus only, whereas the SSN1SXCSA and SSN1IXCSA boards on the OptiX OSN 3500 support the 622 Mbit/s bus and 2.5 Gbit/s bus. After the logical board in slot 5 on the OptiX OSN 3500 is set to the SSN1SLQ4, the NE software informs the cross-connect board that the bus of the board in slot 5 is 622 Mbit/s through the inter-board communication. After learning the information from the NE software, the cross-connect board sets all the buses of the board in slot 5 to 622 Mbit/s. If the logical board in slot 5 is changed to the SSN1SL64, the NE software informs the cross-connect board that the bus of the board in slot 5 is 2.5 Gbit/s. After learning the information from the NE software, the cross-connect board sets all the buses of the board in slot 5 to 2.5 Gbit/s.

3 .      According to the preceding analysis, the bus of the SSN1SLQ4 is 622 Mbit/s, and therefore the SSN1SLQ4 requires four 622 Mbit/s buses to support four optical interfaces. However, slot 4 supports only two buses. That is why only the former two optical interfaces are available. Slots 5, 6, 13, and 14 support four buses. After the board is installed in slot 5 or 14, all the optical interfaces are available.

Root Cause
Bus wiring problem with the cross-connect board (This case is similar to case SC0000416004 but provides more description.)
Suggestions

1  .      When performing the board slot planning, you need to consider the service access capacity of the slot, and the bus rate of the cross-connect board and the N1SLQ4 board.

2   .     The bus of the backplane on the OptiX OSN equipment is available in two types: 622 Mbit/s and 2.5 Gbit/s (the OptiX OSN 1500 and the OptiX 2500 support only the 622 Mbit/s bus). The SSN1GXCSA, SSN1EXCSA, and SSN1UXCSA/B boards on the OptiX OSN 3500 support only the 622 Mbit/s bus, whereas the other cross-connect boards on the OptiX OSN 3500 and the OptiX OSN 7500 support the 622 Mbit/s bus and the 2.5 Gbit/s bus.

END