Telemetry or distributed acquisition systems were introduced in 1976 to overcome the lack of channel capacity on conventional systems, due to the fact that all active geophone groups are connected to the recording instrument by aminti-pair cable equipped with high-density plugs. In the architecture of the telemetry system, the electronics are distributed along the spread rather than concentrated at the recording site, the analog pairs being replaced either by a radio link or by a digital cable (electric or fiber-optic). For economic and administrative reasons, most of the land seismic telemetry systems in operation today use electric cables to interconnect the field electronics.


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