Question Description

When the OSN3500 is configured with a 200GIXCSA cross board with a 10Gbit/s rate in slots 5, 6, 13, and 14, why can I plug in SLQ16 but not SLD16?

Alarm message

None

Processing

After checking, it is confirmed that SLD16 cannot be plugged in slots 5, 6, 13 and 14.

Root cause

The slots that can be inserted by the single board are related to the slot capacity, cross capacity, single board version and the bus rate of the single board.

The backplane rate of the crossover board ( N1IXCSA/B ) supports 622M/2.5G compatibility, and the backplane rate of other single boards is fixed.

2. The bus rate of N1SLD16 single board is 622M, which requires 8 buses, but the bus distribution of the cross board ( N1IXCSA/B ) is 2 buses for slots 1-4, 15-17, 4 buses for slots 5, 6, 13, 14, and 16 buses for slots 7, 8, 11, 12 only to meet the requirements, so N1SLD16 single board can only be installed in slots 7, 8, 11, 12, Therefore, the N1SLD16 board can only be installed in slots 7, 8, 11 and 12.

3. The backplane rate of SLQ16 single board is 2.5G, so when configuring IXCSA, the 4 buses in slots 5, 6, 13, and 14 meet the requirements of 42.5G optical ports, so SLQ16 can be inserted in slots 5-8 and 11-14, while slots 1-4 and 15-17 have 2 buses and can only be configured with two optical ports.

Solution

Replace the SLD16 in slots 7-8, 11-12.

Recommendations and Summary

When selecting a single board, you should first understand the characteristics of the single board and the bus distribution to ensure the normal use of the single board.