Feasibility study of non-invasive telemetry techniques for use with submarine telephone cables
By: by Neil L. Brown, Daniel E. Frye and John Proakis.
Contributors: Frye, Daniel Evan.; Proakis, John G.; Woods Hole Oceanographic Institution.
Series: WHOI -- 93-03.; WHOI (Series) -- 93-03.
Publisher: Woods Hole Oceanographic Institution
Published: 1993
Place of publication: Woods Hole, MA
Language: eng
Number of pages: 44
Subjects: Woods Hole Oceanographic Institution.; Cables, Submarine.; Telemetry.
Description: The feasibility of using inductive coupling with existing submarine telephone cables for telemetry of data from ocean sensors was investigated. The submarine telephone cable was simulated with a computer model and the model results were tested experimentally by deploying 600 meters of coax cable in Woods Hole Harbor. In parallel a study of the optimum access methods and modulation and techniques was performed. Results of the feasibility study showed that a non-invasive technique for inductive coupling is not feasible for use with existing SF and SD coaxial cable designs. Signals induced in both conductors by a toroid encircling the cable remain identical as they propagate along the cable as a result of mutual inductance. Thus, no signals are apparent at the repeaters. Optimal use of cable bandwidth combines time division multiple access with trellis-coded QAM modulation.
Notes: "January 1993."

Undersea cables.

Inductive coupling.

Ocean data telemetry.

Funding was provided by the IRIS Consortium under sub-award agreement No. 0169 and by the W.M. Keck Foundation through their Technology Innovation Awards.

Also issued online.