Requirement for a WDM board to receive STM-4 services and service boards supporting STM-4 services

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To receive STM-4 services, the WDM board must support STM-4 services. The following service boards support STM-4 services: LDM, LQM, TOA, THA, TOM, TQM, and LOA.

Other related questions:
WDM boards that support STM-4 services
The following WDM service boards support STM-4 services: LDM, LQM, TOA, TOM, and TQM.

Whether the client side of an LWX2 board on OSN 1800 supports STM-4 (662 Mbit/s) SDH services
The client side of an LWX2 board on OSN 1800 supports STM-4 (662 Mbit/s) SDH services.

Whether the client side of the LWX2 board on OSN 1800 supports STM-4 (622 Mbit/s) SDH services
The client side of the LWX2 board on OSN 1800 supports STM-4 (622 Mbit/s) SDH services.

Whether a THA board can receive STM-16 services
Yes, a THA board can receive STM-16 services. At the time point, Service Type of the board is set to STM-16, the Service Mode is set to Client Mode, and Port Working Mode of the corresponding port is set to ODU1 non-convergence mode (Any->ODU1).

Whether LOA boards support STM-16 services, and mapping path if STM-16 services are supported
In ODU1 non-convergence mode, LOA boards can receive STM-16 services. They map STM-16 services into ODU1 services.

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