No reason to use same cables for clock as for data stream. Clock cable sensitive to exact impedance match. Get the best 75 ohm cable and terminate it with decent 75 ohm BNC connectors: if you want the best, get the Furutech rhodium BNC connectors at $175 a pair. Total cost maybe $275. It's surprising by how much some highly regarded cables fail to exactly meet the 75 ohm specification and any deviation will produce internal reflection in the cable.
For the data, other factors come into play. Dcs did use MIT Oracle last time I was in their factory, but I see they've been replacing all those recently
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