Patent ID: 7230541
Filing Date: 2007-06-12
Classification: G01V

Abstract:
1. A system for communication with a downhole tool comprising: a first communication transceiver in a first tool for measurement while drilling and a second communication transceiver in at least one of said first tool, a second tool for measurement while drilling, and an external instrumentation interface; a bus system comprising a first conductive connection and a second conductive connection in each of said first tool and said at least one of said first tool, a second tool and an external instrumentation interface, said first conductive connection and said second conductive connection of said first tool in operable communication with said first communication transceiver and said first conductive connection and said second conductive connection of said at least one of said first tool, a second tool and an external instrumentation interface also in operable communication with said second communication transceiver; wherein said first communication transceiver and said second communication transceiver employ at least one of Quadrature Amplitude Modulation (QAM) and Discrete Multi-Tone (DMT) modulation; and wherein said bus system carries a combined communications signal including least one of a modulated communication signal, a power signal, and an existing communications signal.