Sony BRC-300P Operating Instructions Manual page 9

BRBK-302 SDI Card
Insert the card into the camera or the Optical Multiplex
Unit to allow output of a signal conforming to
SMPTE259M serial digital interface standards.
BRBK-303 Optical Multiplex Card
Insert the card into the camera to allow high-bit
multiplex transfer via optical fiber (video, external video
sync and control signals).
Video Switcher (commercially available)
It switches the video signal input of multiple cameras.
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System Components