Slots for holding TDX boards in an OptiX OSN 6800 subrack

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In an OptiX OSN 6800 subrack, a TDX board can be installed in any slots of IU1 to IU17.

Other related questions:
Service capacity of each slot in an OptiX OSN 6800 subrack equipped with the NQ2 board
If the TN12XCS board is used, the NQ2 board supports a service capacity of 40 Gbit/s when it is installed in slot 1, 4, 11, or 14; the NQ2 board supports a service capacity of 20 Gbit/s when it is installed in any of other slots and only optical ports IN1/OUT1 and IN2/OUT2 of the board are available. If the TN11XCS board is used, only optical ports IN1/OUT1 and IN2/OUT2 of the NQ2 board are available and therefore the board supports a service capacity of only 20 Gbit/s regardless of the slot housing the board.

Service capacity of each slot in an OptiX OSN 6800 subrack equipped with the TQX board
If the TN12XCS board is used, the TQX board supports a service capacity of 40 Gbit/s when it is installed in slot 1, 4, 11, or 14; the TQX board supports a service capacity of 20 Gbit/s when it is installed in any of other slots and only optical ports RX1/TX1 and RX2/TX2 of the board are available. If the TN11XCS board is used, only optical ports RX1/TX1 and RX2/TX2 of the TQX board are available and therefore the board supports a service capacity of only 20 Gbit/s regardless of the slot housing the board.

Cross-connect capacity of each slot in an OptiX OSN 6800 subrack
If the TN12XCS board is used, each of the IU1, IU4, IU11, and IU14 slots supports a maximum cross-connect capacity of 40 Gbit/s. Each of the other service slots supports a maximum cross-connect capacity of 20 Gbit/s. If the TN11XCS board is used, each of all service slots supports a maximum cross-connect capacity of 20 Gbit/s. When IU17 is used as a service slot, no service grooming is supported.

Whether an OptiX OSN 8800 subrack can function as a slave subrack of an OptiX OSN 6800 subrack
Yes, it can function as a slave subrack of an OptiX OSN 6800 subrack.

Slots that can house the NQ2 board in an OSN 6800 subrack
On the OSN 6800, all service slots can house the NQ2 board. The NQ2 board can occupy 40G bandwidth in slot 1, 4, 11, or 14 (the slots are 40G slots), and can occupy only 20G bandwidth in any other service slots.

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