Phone call causes ADSL to drop out?

Discussion in 'Home Networking' started by Biggles, Apr 28, 2008.

  1. Biggles

    Biggles Guest

    Has anyone had a similar problem to this:

    Since BT OpenReach did some work outside of my house a couple of months
    ago, my BB bandwidth has dropped from 5-6.5 Mb/s to 2-3 Mb/s, and as low
    as 512Kb/s at times.

    When making a phone call, the sound of the router negotiating can be
    heard (sounds much like an analogue modem), albeit very feintly.

    Making a phone call on the same line causes the ADSL link to drop. I
    have two ADSL filters on different junction boxes and I get the same
    result on both.

    I'm just wondering if this is a known issue - i.e. BT cocking something
    up which causes the phone to interfere with the BB. BT phone people say
    they've checked the line and it's OK and to contact my ISP. However, I
    want to be fully clued up before braving the script-driven Indian call
    centre.

    TIA
    Biggles
    (Remove packing from my address to e-mail me)
     
    Biggles, Apr 28, 2008
    #1
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  2. Biggles

    Justin P Guest

    Looks like they tired to squeeze more traffic to one line.
    Thats strange, because ADSL splitter (in fact simple passive low-pass
    filter) should filter out higher frequencies coming to phone from ADSL
    modem.
    From symptoms I would say that bandwidth used by ADSL modem and phone
    line overlaps. I would be very skeptical about phone company changing
    standard ADSL bandwidth to something other than 25.875 kHz.

    What I would do:
    1) Test if your splitter is OK. Go to a friends house and use @ his ADSL
    line.
    1.1) If you can hear *his* ADLS modem dialing - your splitter malfunctions.
    1.2) If you can't hear his ADSL modem dialing - splitter is OK, *your*
    ADSL model malfunctions and uses frequencies other than predefined.

    I would bet for bad splitter.

    However, I
     
    Justin P, Apr 28, 2008
    #2
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  3. Biggles

    Biggles Guest

    Mmm, that's probably worth a go. But as I said I have two filters on
    different junction boxes and I get the same results on both. I figure if the
    symptoms suggest a bad splitter or signal problem then if both splitters
    show the same symptoms it's a signal problem - and BT Openreach doing work
    outside of my house sounds like *too* much of a coincidence.

    Biggles
     
    Biggles, Apr 28, 2008
    #3
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