Whether there are fiber connections between the NQ2 board and the TOM board on OptiX OSN 8800

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There is no fiber connection between the NQ2 board and the TOM board, which are interconnected through a cross-connect board.

Other related questions:
Whether there are fiber connections between an NQ2 board and a TOM board on an OSN 8800
There is no fiber connection between an NQ2 board and a TOM board. The two boards are interconnected through a cross-connect board.

Whether fibers are required to interconnect the TOM and NQ2 boards on the OSN 8800
On the OSN 8800, a TOM board is a tributary board while an NQ2 board is a line board. They are interconnected using cross-connections configured on the NMS instead of using fibers. A cross-connect board is used to achieve the cross-connections between the TOM and NQ2 boards so that services on the two boards can be interconnected.

Whether OptiX OSN 8800 supports 10G boards
Yes. 10G OTU boards, tributary boards, and line boards are all available in OptiX OSN 8800.

Whether the TOM board supports 155 Mbit/s client-side services
The TOM board supports 155 Mbit/s client-side services.

Whether the 53ND2 board can substitute for the 12ND2 board on OptiX OSN 8800
The 53ND2 board can substitute for the 12ND2 board but cannot substitute for the 11ND2 board.

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