Underwater communication system

摘要

A two-tier comnumication system for a seismic streamer. The communication system operates over an unshielded twisted-pair communication line extending the length of the streamer. Repeater units having a repeater fimction and a device con troller fimction divide the twisted pair into tine segments. Coits an each segment couple signals inductively to collocated external devices ina low-speed 2400 baud FSK data hak between the devices and an associated device controtler. A Gaussian 8-level FSK high-speed 60 kbitis data hak is estabhished along al the segments with the repeaters re-transmitting boosted signals along the en- the length of the communication line. The coils are transparent at the high-speed data rate. Time division inultiple avcess (TDMA) or frequency division mu access (EDMA) is used to accommodate the two hinks on the single twisted pair.