Relationship between SXM and XCT boards in an OSN 8800 T64 subrack

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When the SXM and XCT boards work together in an OSN 8800 T64 subrack, ODUk cross-connections can be scheduled. The two boards do not form active/standby protection. To configure 1 + 1 backup for SXM boards, you need to insert two SXM boards of the same version into IU10 and IU44 slots or IU9 and IU43 slots.
When an OSN 8800 T64 subrack contains only SXH or SXM cross-connect boards and XCT boards need to be added to support ODUk services, you must insert the physical boards before adding logical boards; otherwise, existing SDH services will be interrupted.

Other related questions:
Whether 1:1 protection can be configured for the SXM and XCT boards configured in an OptiX OSN 8800 T64 subrack
In an OSN 8800 T64 subrack, intra-subrack ODUk service grooming is shared by one SXM board and one XCT board. An OSN 8800 T64 subrack adopts dual-side configurations. It has two SXM boards and two XCT boards. The SXM and XCT boards on the front and back sides work in 1:1 protection mode.

Whether XCT or UXCT is required for scheduling of only VC services only in an OSN 8800 T64 subrack
No, XCT or UXCT is not required in this scenario. This is because that intra-subrack VC services are processed only on the USXH, SXH, and SXM boards.

Principles for configuring the ST2 board in the OptiX OSN 8800 T64 subrack
The ST2 board is optional for an OptiX OSN 8800 T64 subrack and is configured based on service requirements. It receives, processes, and transmits two OSC signals in the east and west directions. In addition, it can process IEEE 1588v2 synchronous clock signals and transparently transmit two FE signals. The ST2 board is not recommended for the networks where the ROP board, Raman board, HBA board, or optical-layer ASON is used. In such a network, the SC1 or SC2 board is recommended.

Active/standby relationship between the four PIU boards in an OSN 8800 T32 subrack
In an OSN 8800 T32 subrack, the active/standby relationship between the four PIU boards is as follows: The PIU boards in slots 39 and 40 are in a pair and function as the active power boards, and the PIU boards in slots 45 and 46 are in a pair and function as the standby power boards.

Working mode of cross-connect boards in hot backup in an OSN 8800 T64 subrack
Two USXH boards are configured for each OSN 8800 T64 subrack, one on the front side and one on the rear side. UXCT boards are configured in the same way. The USXH (UXCT) boards on the front and rear sides are in 1+1 hot backup mode.

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