Patent ID: 7061829

Claim:
A seismic data recording system, comprising: a recording unit; a first signal processing unit operatively coupled through one of a first and a second electrical termination thereon to the recording unit; a first seismic sensor cable operatively coupled at one end to the first signal processing unit through the other of the first and second electrical termination thereon, the first seismic sensor cable operatively coupled at its other end to a second signal processing unit through one of a first and a second electrical termination thereon, the first seismic sensor cable having at least one seismic sensor operatively coupled thereto; and a second seismic sensor cable operatively coupled to the second signal processing unit, the second seismic sensor cable having at least one seismic sensor operatively coupled thereto, the first and second signal processing units each having circuits therein including a telemetry receiver to detect command signals originating from the recording unit, the circuits including a switch to selectively couple a data telemetry transmitter to the one of the first and second terminations from which the command signals are detected, the circuits including a switch to selectively couple the other of the first and second terminations to portions of the circuits including a sensor signal input to receive signals from a seismic sensor.