WHOI SDSL Data-Link Project—Ethernet Telemetry through Sea Cables

Marshall Swartz Woods Hole Oceanographic Institution, Woods Hole, Massachusetts

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Daniel J. Torres Woods Hole Oceanographic Institution, Woods Hole, Massachusetts

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Steve Liberatore Woods Hole Oceanographic Institution, Woods Hole, Massachusetts

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Robert Millard Woods Hole Oceanographic Institution, Woods Hole, Massachusetts

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Abstract

A data telemetry technique for communicating over standard oceanographic sea cables that achieves a nearly 100-fold increase in bandwidth as compared to traditional systems has been recently developed and successfully used at sea on board two Research Vessel (R/V) Atlantis cruises with an 8.5-km, 0.322-in.-diameter three-conductor sea cable. The system uses commercially available modules to provide Ethernet connectivity through existing sea cables, linking serial and video underwater instrumentation to the shipboard user. The new method applies Synchronous Digital Subscriber Line (SDSL) communications technology to undersea applications, greatly increasing the opportunities to use scientific instrumentation from existing ships and sea cables at minimal cost and without modification.

Corresponding author address: Marshall Swartz, Woods Hole Oceanographic Institution, 266 Woods Hole Road, MS 30, Woods Hole, MA 02543. E-mail: mswartz@whoi.edu

Abstract

A data telemetry technique for communicating over standard oceanographic sea cables that achieves a nearly 100-fold increase in bandwidth as compared to traditional systems has been recently developed and successfully used at sea on board two Research Vessel (R/V) Atlantis cruises with an 8.5-km, 0.322-in.-diameter three-conductor sea cable. The system uses commercially available modules to provide Ethernet connectivity through existing sea cables, linking serial and video underwater instrumentation to the shipboard user. The new method applies Synchronous Digital Subscriber Line (SDSL) communications technology to undersea applications, greatly increasing the opportunities to use scientific instrumentation from existing ships and sea cables at minimal cost and without modification.

Corresponding author address: Marshall Swartz, Woods Hole Oceanographic Institution, 266 Woods Hole Road, MS 30, Woods Hole, MA 02543. E-mail: mswartz@whoi.edu
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