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what do the cerebras systems use for fiber transceivers? i think it's integrated into the engine block io cards, but i can't find a photo of where they actually connect; just this photo off servethehome of a cs-1 system, showing the fibers snaking off into the engine block

a view of the top of a cerebras cs-1 system with the top cover off. the left half is two watercooling pumps (and associated manifolds), while the right side has, from front to back, a set of fiber front-panel connectors, a large motherboard for management controls, and then the engine block and its many waterblocks. several red fiber cables snake from the front panel, past the motherboard, and into the engine block. a view of the top of a cerebras cs-1 system with the top cover off. the left half is two watercooling pumps (and associated manifolds), while the right side has, from front to back, a set of fiber front-panel connectors, a large motherboard for management controls, and then the engine block and its many waterblocks. several red fiber cables snake from the front panel, past the motherboard, and into the engine block.
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