Cooperation between ST2 and SFIU

An SFIU board multiplexes the main path signals and OSC signals into a single communications channel, and demultiplexes these signals. The OSC board that can work with the SFIU board can only be ST2.
The SFIU board sends OSC signals to the ST2 board through the OSC1 optical port and receives OSC signals from the ST2 board through the OSC2 optical port.

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