ADSL thru your power sockets.....

Discussion in 'Desktop & Laptop Computers Forum' started by lightningvictim, Mar 11, 2003.

  1. lightningvictim

    lightningvictim
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    http://www.hydro.co.uk/broadband/

    This is an initiative by the Scottish Executive to get Broadband to marginal areas (like the Scottish Highlands).
    As I live in Stonehaven and BT haven't got their act together yet it looks like Broadband this year may not be out of the question!!!
    Saw a program on Discovery about this technology years ago and always wondered why it hadn't been adopted in the UK previously.
     
  2. Chris Muriel

    Chris Muriel
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    The technology used must be Powerline Carrier AKA Powerline Transmission or Telecommunications (PLC/PLT).
    Norweb in conjunction with Nortel did some trials with a variant of this a few years ago ; some schools in Trafford, Manchester had free internet access using it. After a couple of years, the trial finished and the joint company originally set up to pursue the technology was wound up.
    Powerline technology is used somewhat in Germany ; it doesnm't have to be used for net access , having just as much potential as a means for home-networking - without having to run Cat-5 cable.

    In the USA they have a standard for this called Homeplug + 1 for doing the same via your phone lines called HPNA.
    The biggest problem is that the mains does not have anything like a uniform impedance and has all sorts of discontinuities depending on an individual's property's wiring , installed equipment etc.
    As well as YMMV issues, there have been cases of severe RF interference in a Powerline environment. In cases where the system has been used externally (like the Scotish Power scheme) there were instances of street lights being wrongly triggered on or off due to EMC issues.
    There's some info on this at the RSGB's website ; go to www.rsgb.org and click on the obvious link there ; of course, since the RSGB represents UK radio hams, it is obvious what they are worried about - RF interference.
    There is also a draft ETSI standard : ETSI TS 101 867 V1.1.1 (2000-11) Powerline Telecommunications (PLT); Coexistence of Access and In-House Powerline Systems .
    There's a UK company called Lanergy who design powerline gear
    (and have a website) . There was an interesting UK player called nSine - but unfortunately they collapsed a few months ago (I was involved work-wise with them in applications support for some of our ICs that they used , working for Analog Devices).
    You can go to my company website www.analog.com and type "Powerline" in the search box to link to info concerning some of the ICs that can be used to implement this. There are also ICs from companies like Cogency and Connexant.
    In the USA , you can go into computer stores and purchase a Homeplug box off the shelf (same applies for HPNA too).

    Chris Muriel, Manchester
     

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