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When Install SLQ4 board on slot 1 to slot 4 in OSN 3500?

Issue Description

SLQ4 board is hardly fully utilize in slot 1 to slot 4 in OSN 3500 although the

slot capacity can support until 5G.
NG-SDH manual:
When the cross-connect capacity is 80 Gbit/s or 200 Gbit/s(S/I XCS),

for the board housed in any of slots 1–4 and 15–16two optical interfaces

can be configured. For the board housed in any of slots 5–8 and 11–14, four

optical interfaces can be configured.

Alarm Information

NULL

Handling Process

The Slot 1 to 4 of OSN 3500 was created for the utilization of the smaller capacity

service board. So SLQ 4 is pretty suggested on slot 4 above .

Root Cause

The cross-connect board (N1E/IXCSA/B) supports two compatible backplane rates

of 622M and 2.5G. Other boards support only one fixed backplane rate. The N1SLQ4

needs 4 buses at a rate of 622M. The cross-connect board (N1E/IXCSA/B) has two

buses in slots 1–4 and 15–17, four buses in slots 5, 6, 13 and 14, and 16 buses in slots 7, 8, 11

and 12. Therefore, the SLQ4 can be installed only in for 2 optical boards which can connect to 2 buses.
The cross-connect board supports two compatible backplane rates of 622M and 2.5G.

Other boards support only one fixed backplane rate. Hence, consider both the access

capacity of each slot and the bus distribution of the cross-connect board for board installation.

This method also works for other line boards.

Suggestions

The backplane designed can be improved for this situation to giving customer more option for

utilization on different capacity service board on the sub rack OSN .

 

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