Those green boxes on the corners

Discussion in 'Broadband' started by David Hume, Nov 1, 2015.

  1. David Hume

    David Hume Guest

    My telephone line is connected directly to the exchange which is about a
    kilometre away. I wondered if this is better or worse for broadband (and
    telephone) than being connected to one of the local green boxes. I hear
    of people getting problems when water gets in the boxes and into the

    Is it possible to change? Would it be a good idea to do so?

    I am not on fibre optics currently.

    (I think they are green, maybe they are blue, or grey).
    David Hume, Nov 1, 2015
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  2. You have what is known as an EO line. In practical terms you can not change.

    With ADSL or ADSL2+ it is the cable distance to the exchange that
    matters rather than whether the path involves a cabinet.

    The problem comes if FTTC is introduced as you don't have a cabinet. You
    have to hope that a fibre cabinet is sited outside the exchange or some
    other arrangement is made for the VDSL equipment.

    FTTC/VDSL is only of benefit to users within about 1.5km cable distance.
    Michael Chare, Nov 1, 2015
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  3. David Hume

    Roland Perry Guest

    It's certainly the case that "classic" ADSL will be better in your
    circumstances, but FTTC is a bit of a problem if you don't have a "C"

    Originally BT said they wouldn't even be fitting a faux-cabinet in the
    exchange, for such subscribers; perhaps because the 1km of line from
    that cabinet to your house would mean no improvement over "classic
    Roland Perry, Nov 1, 2015
  4. David Hume

    PeterC Guest

    The newish fibre boxen at one place in town are on a sunny corner, against a
    wall which gets well heated by the sun from the other side and there's a lot
    of traffic at the lights - the boxen are black!
    PeterC, Nov 1, 2015
  5. David Hume

    Roger Mills Guest

    I guess that you have to have what you're given - and like it!

    As others have said, FTTC would be a problem with no cabinet (unless one
    is sited close to the exchange for the benefit of those - like you - who
    are currently directly connected.

    What speed are you currently getting with your wired internet connection?
    Please reply to Newsgroup. Whilst email address is valid, it is seldom
    Roger Mills, Nov 1, 2015
  6. My understanding was the BT are installing either real or virtual optical concentrators in the exchange. Where I am at least two BT FTTC cabinets are less than 1km from the exchange.
    R. Mark Clayton, Nov 1, 2015
  7. David Hume

    David Hume Guest

    I am getting 6 Mbps. Stop laughing! That is only because I am too stingy
    to upgrade. (That's Mega bits per second I think, tested here:

    I am pretty sure when I tested it yesterday it said 11 Mbps. Maybe it
    was a fault with the web site.

    I thought that if I ventured into local loop un-bundling I might end up
    with a wire to a cabinet.
    David Hume, Nov 1, 2015
  8. David Hume

    Graham J Guest

    Probably nothing you can do will get you a different wire.

    If you order a totally new phone service, and there are no spare pairs
    in the bundle that contains your existing pair, there is the theoretical
    possibility that BT will install a new cable to the nearby cabinet.

    The guvmint is always on about "theoretical possibilities". Theirs are
    much more likely (e.g. you might get autism from the MMR jab) than a LLU
    supplier giving you a new wire!
    Graham J, Nov 1, 2015
  9. David Hume

    Martin Brown Guest

    You have an exchange only line which may well have the odd joint in it
    anyway. But at 1km you are only just inside the range where FTTC would
    work. My EO line is >3km and my nearest cabinet even further away still.
    If you opt for fibre they might swap you over but don't hold your breath
    or expect it to be without costs.

    The guy who lives *opposite* the new FTTC cabinet in our village was
    stung for several £k to have a new line from that box run over the road
    to his home instead of his existing EO line because the new box was
    installed on the "the wrong side of the road" to him! I kid you not!!!
    Martin Brown, Nov 2, 2015
  10. David Hume

    Clive Page Guest

    As a matter of interest, how can you find out whether your telephone
    line is connected via green cabinet or goes directly to the exchange?
    Clive Page, Nov 2, 2015
  11. David Hume

    Andy Burns Guest

    Give it the phone number ...

    Andy Burns, Nov 2, 2015
  12. David Hume

    Roland Perry Guest

    In message <>, at
    For my unbundled line:

    "There is no data available for this number. This could be either
    because it is not a BT line or it is a new BT number that has just been
    provided. Most new numbers will appear on the checker 24 hours after BT
    has installed the line."

    A rare case of the separation between BT and Openreach? Apart from the
    "BT-installed" lines of course.
    Roland Perry, Nov 2, 2015
  13. David Hume

    David Hume Guest

    In my case an openreach engineer told me. He had a machine which could
    tell how far away the fault in the line was, which I thought was pretty
    amazing. But I expect it's just obvious physics to those in the know.
    David Hume, Nov 2, 2015
  14. It actually works on a surprisingly simple principle. Google time
    domain reflectometry.
    Mike Tomlinson, Nov 2, 2015
  15. David Hume

    Chronos Guest

    Time domain reflectometry. A line has a characteristic impedance. A
    break, fault or crush will throw that out and cause a signal reflection.
    Measure the time the reflected pulse comes back, halve it and take into
    account the velocity factor of the cable and you have your distance to
    the fault.
    Chronos, Nov 2, 2015
  16. David Hume

    Bill Ward Guest

    My one is up to date after having placed an order for fibre broadband on
    "This line does not have left in jumpers.There is an open order on your
    line which is due to complete by 16-Nov-2015"
    What does that mean about no left in jumpers and does one know if theirs
    is clean or impacted?

    FTTC Range A (Clean) 65.8 45.3 18.7 11.8 -Available
    FTTC Range B (Impacted) 55 32.4 17.9 8.5 Available

    Bill Ward, Nov 3, 2015
  17. David Hume

    Davey Guest

    I think it's referring to kangaroos with constipation.
    Davey, Nov 3, 2015
  18. David Hume

    Martin Brown Guest

    Yes. It puts a voltage spike down the line and where there is a break
    the round trip time for the reflection tells you the distance.

    Bad news is that the high voltage pulse sometimes heals an intermittent
    fault and you get just a small reflection followed by nothing at all.
    Martin Brown, Nov 3, 2015
  19. David Hume

    Woody Guest

    This may help.,120949.0.html/
    Woody, Nov 3, 2015
  20. David Hume

    Andy Burns Guest

    The jumpers are for the link from the old cab to the new FTTC cab and back.
    I think that's BT speak for "shiny new copper" vs "manky old aluminium
    with dozens of joints" ...
    Andy Burns, Nov 3, 2015
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