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.

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