Whether the STG board is mandatory

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The OSN 8800 of version V100R002 or later is a synchronous system, requiring that all service boards and cross-connect boards are synchronized (with the same frequencies and aligned frame headers). Therefore, a unique reference clock signal and a unique frame header are required. To meet this requirement, each service board outputs services based on the clock signal and frame header of the clock board. Therefore, the STG board is mandatory for the OSN 8800 of version V100R002 or later. Otherwise, centralized service grooming cannot be implemented. The OSN 6800 is asynchronous, having no requirement on a unique clock signal or frame header. Therefore, no clock board is required. The STG board is required only when IEEE 1588v2 needs to be enabled at the electrical layer.

Other related questions:
Cause why the STG board is mandatory for the OSN 8800 but optional for the OSN 6800
The OSN 8800 of version V100R002 or later is a synchronous system, requiring that all service boards and cross-connect boards are synchronized (with the same frequencies and aligned frame headers). Therefore, a unique reference clock signal and a unique frame header are required. To meet this requirement, each service board outputs services according to the clock signal and frame header of a clock board. Therefore, the STG board is mandatory for the OSN 8800 of version V100R002 or later. If no STG board is configured, centralized service scheduling cannot be achieved. The OSN 6800 is an asynchronous system and does not require a unique reference clock or unique frame header. Therefore, no STG board needs to be configured for the OSN 6800.

Difference between STI and STG, and whether STI or STG can work independently
An STI board is a clock interface board that inputs and outputs clock signals. An STG board is a clock processing board that provides clock signals and frame header signals for the system. STI is optional. It is required only when the 2M clock or IEEE 1588v2 function is required or when and the BITS clock needs to be connected to an OCS system.

Whether ST2 and STG must be installed in the same subrack
If the clock functions of the ST2 board need to be used, you must insert the board into the subrack equipped with clock 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.

Scenarios in which STG is required in the OSN 6800
The OSN 6800 is an asynchronous system and does not require a unique reference clock or unique frame header. Therefore, no STG board is required. The STG board is required only when IEEE 1588v2 needs to be enabled at the electrical layer.

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