Loss Limits For 1Mb and above?

Discussion in 'Broadband' started by PsychicStickleBrick, Feb 4, 2004.

  1. Just had a BT engineer do a line test. The result was 43dB.
    He said this will allow 512Kb but not 1Mb, but I thought I've read somewhere
    the limit for 1Mb was now 45dB?

    Any advice?

    PsychicStickleBrick, Feb 4, 2004
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  2. PsychicStickleBrick

    Sunil Sood Guest

    Its 41dB if there is no ADSL equipment on the line.

    45dB if the line has already been enabled.

    Sunil Sood, Feb 4, 2004
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  3. PsychicStickleBrick

    Chris Watts Guest

    Are those Line Attenuation or SNR margin figures?
    Chris Watts, Feb 4, 2004
  4. Thanks Sunil, what are the chances of making a "manual order" for a new line
    and specifying I want it for "1Mb ADSL" (ie if it can't provide a 1Mb service
    then I don't pay)? Would they accept this or will they only accept a
    specification for "ADSL" (whatever the speed) - which would be pointless as I
    can already get 512kb on my current line?
    PsychicStickleBrick, Feb 4, 2004
  5. PsychicStickleBrick

    Sunil Sood Guest

    A "manual order" is for ADSL - it sounds to me that you are talking about
    having a new BT line put in..

    You can certainly order a new BT line and specify while ordering that it
    must be suitable for 1MB (or even 2MB - the line limit is the same).

    It is then up to BT if they proceed with the order or cancel it having
    decided what you want is not achieveable.

    If they install the line and it then can't reach the specified speed they
    should then remove the line and refund the installation fee (£74.99) - just
    ensure that it is mentioned in the order notes (ring back and check etc)

    The other option is that BT are currently trialling the option where ISP's
    order new lines (and ADSL) on behalf of a customer - you could try that

    I know A&A are taking part in the trial and I imagine you may be able to
    find a few other ISP's as well...

    Sunil Sood, Feb 4, 2004
  6. the former. 45 dB of SNR would be orgasmic.

    Phil Thompson, Feb 4, 2004
  7. PsychicStickleBrick

    Chris Watts Guest

    Oh? On my line the Line Attenuation is approx 19dB and the SNR margin is
    about 41 - and it works just fine with 512k adsl!
    Chris Watts, Feb 4, 2004
  8. of course it does, bigger is better. Worry when it gets to 6 dB

    Phil Thompson, Feb 4, 2004
  9. PsychicStickleBrick

    Kráftéé Guest

    Line loss
    Kráftéé, Feb 4, 2004
  10. PsychicStickleBrick

    Andy Furniss Guest

    Do you know if BTs' measurments generally agree with those reported by a

    My line is 3km (from the line test long ago) but attenuation 48/49, not
    that I can afford it anyway, but it would be nice to know.


    Andy Furniss, Feb 8, 2004
  11. PsychicStickleBrick

    Sunil Sood Guest

    It depends on what model modem (and firmware version I guess) you have.

    Some report figures which are relatively close to BT's figures while other
    makes give different readings - sometimes wildly out..

    Sunil Sood, Feb 11, 2004
  12. PsychicStickleBrick

    Kráftéé Guest

    Sometimes even BT's test equipment varies between each piece of kit used,
    but not enough to get the readings comfortably into the right zone for 1-2mb
    service I'm afraid..
    Kráftéé, Feb 11, 2004
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