Working mode of cross-connect boards in hot backup in an OSN 8800 T64 subrack

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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.

Other related questions:
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.

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

Maximum number of OSN 8800 T64 subracks in an N66B cabinet
N66B cabinets are universal cabinets and can be used to hold different types of subracks or frames. An N66B cabinet has the front and rear sides. Each side consists of four areas. OSN 8800 T64 subracks are installed in areas 1 and 2 on the front and rear sides. Each of the OSN 8800 T16 subrack, OSN 8800 platform subrack, OSN 8800 universal platform subrack, and OSN 6800 subrack occupies one area, and the OSN 8800 T32 subrack occupies two areas.

Cross-connect matrix structure for OSN 8800
Similar to line boards and tributary boards, each cross-connect board has internal interfaces. The internal interfaces on cross-connect boards are connected through the backplane of the resident subrack to achieve service grooming.

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.

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