About 25 years ago, some of the most successful acquisition systems were the Texas Instruments DFS-4 and DFS-5. They allowed crews to operate with, perhaps, around 120 channels. There were larger crews, but some suffered problems. Each seismic channel required one analog data pair in the spread cable, and any cable with more than 120 pairs of conductors can be heavy, unreliable, and expensive.

Nowadays it is rare to see such hardware in use because the market for acquisition geophysics moved on and needed many more channels, and the cost of acquisition per channel had to drop. Analog cable technology...

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