Whether XCT or UXCT is required for scheduling of only VC services only in an OSN 8800 T64 subrack

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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.

Other related questions:
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.

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.

Impact of the fault of the only AUX board in an OSN 8800 subrack
The AUX board implements inter-board and inter-subrack communication, and intra-subrack management. If the board is not equipped with 1+1 protection and becomes faulty, the communication between its resident NE (or subrack) and the U2000 server will be interrupted.

Whether OSN 8800 MPLS-TP supports encapsulation only of Ethernet services
Currently, the MPLS-TP protocol in OSN 8800 supports only encapsulation of Ethernet services and cannot encapsulate the MPLS label for SDH services.

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.

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