Can ADSL signal be disrupted by analog fax machine?

Discussion in 'Broadband' started by davidw, Oct 11, 2006.

  1. davidw

    davidw Guest

    We are thinking of converting our fax line to carry ADSL but I have
    heard that ADSL can be affected by some fax machines. Is this true? I
    thought the splitter took care of seperation between analogue and
    digital signals.
    davidw, Oct 11, 2006
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  2. davidw

    Alastair Guest

    Many of our clients use their fax lines for ADSL with no problems. I've
    heard the same as you, but never seen the problem for myself.
    Alastair, Oct 11, 2006
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  3. davidw

    ABC Guest

    As long as the filter is of a decent build, then there shouldn't be any
    ABC, Oct 11, 2006
  4. davidw

    Jim Howes Guest

    While I have heard similar, I have never actually seen an example that could not
    be explained by defective FAX equipment, defective filters, or outright
    stupidity on the part of the user. ADSL on a a properly filtered line should not
    be affected by any equipment on the filtered side of the line. Cheap filters
    probably contribute here, so get good quality filters. You can also place
    multiple filters in series (but make sure you take the ADSL signal from the one
    nearest the exchange ;-)

    A modern fax machine is just a scanner and printer on top of a cheap modem; our
    main ADSL line is shared with an analogue modem without problems. I know of
    over 1000 sites around the UK where an ADSL router is plugged into a line, and
    the router has a modem strapped to it, also connected to the line, for remote
    router configuration purposes.
    Jim Howes, Oct 11, 2006
  5. We are thinking of converting our fax line to carry ADSL but I have
    I have no problem at all with mine. Always make sure you use a good quality
    filter such as those sold by .

    Peter Crosland
    Peter Crosland, Oct 11, 2006
  6. There were some postings here a few years ago which named specific fax
    machines which were deemed incompatible with ADSL by the manufacturer
    (for whatever reason). Have a search.
    Colin Forrester, Oct 11, 2006
  7. Yep - a client had one. Can't remember what the hell it was now but it
    buggered ADSL right up. This was back in the days of engineer installs
    (2001) and it certainly wasn't a filter issue. The machine splattered
    conducted and emitted RF all over the MF band and you could pick it up
    using a normal radio over 30 metres outside the building. Before
    anyone asks - yes it was CE approved (or stamped as CE approved
    anyway). The BT engineer took one look at the fax, said "Its that" and
    then proceeded to do the radio test with a radio that had been lying
    on a desk once he knew I was an electronics engineer.

    Zen used to (maybe still do?) have a list of fax machines which have
    been "proven" to have problems with ADSL. From what I remember they
    were all pretty old and I wouldn't expect any problems with anything
    made this millenium ;-)
    John Naismith, Oct 11, 2006
  8. davidw

    Gaz Guest

    I have seen a line which couldnt pick up faxes once broadband was installed,
    strangely it was a BT model fax.... solution was to switch the BB to another
    of the lines into the business.

    Gaz, Oct 11, 2006
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