An apparatus for collecting geophysical information may include a geophysical information station disposed along a seismic communication cable. A bypass circuit responsive to a command signal is in communication with a switching circuit that is operable to route electrical power, commands, data or a
An apparatus for collecting geophysical information may include a geophysical information station disposed along a seismic communication cable. A bypass circuit responsive to a command signal is in communication with a switching circuit that is operable to route electrical power, commands, data or a combination to bypass the geophysical information station in response to the command signal. An exemplary method for bypassing a geophysical information station in a geophysical information collection system includes sending a command signal to a bypass circuit and activating one or more switching circuits using the bypass circuit to route electrical power, commands, data or a combination to bypass the geophysical information station in response to the command signal.
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1. An apparatus for collecting geophysical information comprising: a first geophysical information station disposed along a seismic communication cable, said first geophysical information station including: a command circuit for receiving command signals from an upstream source and transmitting comm
1. An apparatus for collecting geophysical information comprising: a first geophysical information station disposed along a seismic communication cable, said first geophysical information station including: a command circuit for receiving command signals from an upstream source and transmitting commands to a downstream source;a first bypass circuit responsive to a command signal issued by the command circuit to issue a first bypass signal; anda switching circuit in communication with a first bypass circuit of a first upstream geophysical information station to receive a bypass signal and operable to route electrical power, commands, and data to bypass said first geophysical information station in response to a command signal from a command circuit of the first upstream geophysical information station causing the generation of a first bypass signal by the first upstream geophysical information station. 2. An apparatus according to claim 1, wherein said first geophysical information station comprises a marine system. 3. An apparatus according to claim 1, wherein the seismic communication cable includes a permanently deployed ocean-bottom cable. 4. An apparatus according to claim 1, wherein said first geophysical information station comprises a land system. 5. An apparatus according to claim 1, further comprising one or more isolation transformers coupling said first bypass circuit to command conductors, data conductors or a combination thereof. 6. An apparatus according to claim 1, wherein said first geophysical information station further comprises a self bypass circuit responsive to a self bypass command signal issued by said command circuit to issue a self bypass signal and in communication with said switching circuit, wherein said switching circuit is further operable to bypass said first geophysical information station in response to the issued self bypass signal. 7. An apparatus according to claim 1, further comprising a delay circuit in communication with said first bypass circuit. 8. An apparatus according to claim 1, wherein said first bypass circuit is substantially passive during normal geophysical information station operation. 9. An apparatus according to claim 1, further comprising a shunt regulated power supply. 10. An apparatus according to claim 1, wherein said first geophysical information station includes a bypass power supply. 11. An apparatus according to claim 1, wherein said first bypass circuit is adapted to receive the command signal transmitted from a remote controller to activate said first bypass circuit in response to one or more faults including a fail on power-up condition. 12. An apparatus according to claim 1, further comprising a head end communication device. 13. An apparatus according to claim 12, wherein said head end communication device comprises a media converter configured to convert a signal of a first type into a signal of a second type. 14. An apparatus according to claim 12, wherein said head end communication device comprises one or more processors or microcontrollers. 15. An apparatus according to claim 1, wherein said first geophysical information station further includes: a second bypass circuit responsive to a command signal issued by the command circuit to issue a second bypass signal; andwherein said switching circuit is further in communication with a second bypass circuit of the second upstream geophysical information station to receive a bypass signal and is operable to route electrical power, commands, and data to bypass said first geophysical information station in response to a command signal from a command circuit of the second upstream geophysical information station causing the generation of a second bypass signal by the second upstream geophysical information station. 16. An apparatus according to claim 15, wherein the apparatus further comprises: a second geophysical information station and a third geophysical information station, each of said second and third geophysical information stations including a command circuit, first and second bypass circuits and a switching circuit as in said first geophysical information station,wherein said second geophysical information station is coupled to said first geophysical information station as the first upstream geophysical information station,wherein said third geophysical information station is coupled to said first geophysical information station as the second upstream geophysical information station and to said second geophysical information station as the first upstream geophysical information station, andwherein said switching circuit of said first geophysical information station is coupled to said second bypass circuit of said third geophysical information station without coupling to said second geophysical information station. 17. An apparatus according to claim 1, wherein said first geophysical information station further comprises one or more processors or microcontrollers. 18. An apparatus according to claim 1, wherein said first geophysical information station further comprises one or more sensors. 19. An apparatus according to claim 18, wherein said one or more sensors comprise at least one of the following: a particle motion sensor, a pressure sensor, a multi-component sensor, a temperature sensor, a magnetometer, a global position system, or a timing device. 20. An apparatus according to claim 1, wherein said command signals comprise at least one of the following: a parallel multi-level signal, a polarity reversal signal, a cycled polarity signal, or a dial-up bypass signal.
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