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I'm still confused about the approach to sending broadband over power lines — I'm rather sure some of the articles I've read have contributed to my confusion.

Although it is potentially possible to superimpose radio signals over high voltage power lines (something like the technology employed in Femco (and similar — Gaitronics) trolleyphones and similar, I doubt that it will be useful to transmit signals in the megaHertz range, and in any case, it won't nearly match the signal carry capability of one fiber, let alone a fiber optic cable carrying multiple pairs.

My best understanding / guess of the approach is that the Internet TCP/IP traffic is carried by unused (or lightly used) fibers in fiber optic cables installed for the power companies' own use (maybe with an eye to getting into this business someday) to an interface box installed on, for example, a power pole near one or several residences. Then the "last mile" (last 100 yards?) is superimposed on the low voltage (120/208-240) power lines to individual homes.

Even if my understanding is correct, ham radio operators are concerned about the spectrum pollution caused by these signals (see article referenced below).

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NEWINGTON, CT, Aug 6, 2003--ARRL President Jim Haynie, W5JBP, says Broadband over Power Line (BPL)--if widely deployed--would represent "spectrum pollution" on a level that is "difficult to imagine." Haynie reacted after seeing videotape and early data from recent ARRL field studies in four states where BPL is undergoing testing.
  • (rhk) [[][]]; ; ; —

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  • () RandyKramer - 05 Oct 2003
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Topic revision: r1 - 2003-10-05 - RandyKramer
 
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