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Strange Question

Discussion in 'Electronic Basics' started by Richard Harris, Jan 21, 2005.

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  1. Hi,
    Ive seen something somewhere that you can send data through your AC outlets
    in your house from one to another. Is this possible and how does it work.
    Seems very strange.

    Thanks.
     
  2. I've worked on a system that sends data through 4 miles
    of cable, along with AC power. A phase-shift modulated
    carrier, at a frequency much higher than the AC power
    frequency and its harmonics is used. The tradeoff is
    between loss, which goes up with frequency, and noise
    from other circuits, which show up at lower frequency.
     
  3. Joel Kolstad

    Joel Kolstad Guest

    Nah, it's just that you're only used to 'seeing' 60Hz show up on your power
    lines. Think about DSL phone lines... there's some signals (low frequency)
    used both to carrier voice and power the phone, and there's other signals
    (high frequencies) that carry the DSL data signals.

    Signaling over power lines is very similar. The very popular X-10 series of
    products places 100kHz 'bursts' on the line to transfer data. There's
    also... what are they called... 'power line networking' products that take a
    large frequency range, and, combined with fancy signaling methods, get you
    upwards of 10Mbps of digital data over the phone lines.

    Of course, power lines are _optimized_ to carry power at 60Hz... and lots of
    it. But fundamentally a transmission line is a transmission line, and many
    different signals can be carried on it simultaneously.
     
  4. Bill Carson

    Bill Carson Guest

    Yes, it is quite feasible and is being used in some cases as an alternative
    to
    standard network wiring. For instance:

    See the powerline products at this site:
    http://www.efficient.com/subscriber_networks/homenetworking.shtml

    See the initiative at this site:
    http://www.homeplug.com/en/index.asp

    or just plug: powerline network into Google and read till the cows come
    home.

    HTH

    B.C.
     
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