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A method and apparatus for implementing a communication network for well monitoring and control applications where a twisted pair cable bus is used to connect well-related locations. The twisted pair cable bus will exhibit high parallel impedance when used in differential mode and low series impedan

A method and apparatus for implementing a communication network for well monitoring and control applications where a twisted pair cable bus is used to connect well-related locations. The twisted pair cable bus will exhibit high parallel impedance when used in differential mode and low series impedance in common mode. A bus supervisor and devices connected at nodes can exchange signal transmission. Communication, including data and control, signals and power signals can circulate along the twisted pair cable bus among and between the connected devices.

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1. Apparatus for transmission of electrical signals, including both electrical power and communication signals, between plurality of locations in a subterranean well, the apparatus comprising:a bus supervisor located at one of the plurality of locations; a node located at each of the remaining locat

1. Apparatus for transmission of electrical signals, including both electrical power and communication signals, between plurality of locations in a subterranean well, the apparatus comprising:a bus supervisor located at one of the plurality of locations; a node located at each of the remaining locations of the plurality of locations; a bus interface at the bus supervisor and each node, the interface capable of supporting differential and common mode connection between the bus supervisor and each node, and between the nodes themselves, the interface providing high parallel impedance for differential mode connections and low series impedance for common mode connections; and a bus electrically connecting the bus supervisor and each node via the respective bus interfaces in common mode with an electrical return path to the bus supervisor for transmitting electrical power signals to or between each node location, and in differential mode for two way transmission of communication signals between the bus supervisor and nodes or between the nodes.