100mbit SDSL broadband being rolled out

Discussion in 'Broadband' started by 7, Jul 1, 2005.

  1. 7

    7 Guest

    7, Jul 1, 2005
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  2. 7

    stephen Guest


    and if you read the storey it talks about a cable network using co-ax and
    fibre giving symmetric bandwidth- no mention of SDSL
    cant do this on copper pairs - which is all you get from LLU.

    try talking to the local cable co - but NTL and Telewest only support 3 Mbps
    or so, and low speed uplinks.
    stephen, Jul 1, 2005
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  3. 7

    Bob Eager Guest

    Bob Eager, Jul 1, 2005
  4. 7

    7 Guest

    Oh dear, it appear you were the twit the last time
    who said this couldn't be done.

    And now its done, what you gonna do, jump off a cliff?
    7, Jul 1, 2005
  5. 7

    7 Guest

    Says who? Copper can carry gigahertz. Its how you it that makes
    the difference.

    There are a lot of technologies out there that can deliver high
    speed links over copper.

    Bring on LLU and we shall see!
    7, Jul 1, 2005
  6. 7

    Bob Eager Guest

    No, just point out to everyone that it's pointless discussing anything
    with you (see below).
    Bob Eager, Jul 1, 2005
  7. 7

    Steve Guest

    Get a girlfriend!

    Shagging is way better than faster broadband honestly. I've tried both
    so I know!! In fact I'm doing both of them now!!

    Doggy style is best, u can shag ur girl and watch the computer screen
    for more faster broadband msgs at the same time!

    TMI I know, sorry......

    Steve, Jul 2, 2005
  8. 7

    Ian Stirling Guest

    Copper can.

    The manky pile of assorted impedances crap in the ground can't.
    It peters out much over a few megahertz.
    Perhaps if we ripped it all out and installed better copper, designed
    for higher speeds, and joined with exquisite care to be constant impedance,
    it might change things a bit.
    However, if you're doing this, it's probably better just to go fiber.
    Ian Stirling, Jul 2, 2005
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    7 Guest

    There is a point. Evertime we kick the shit out of BT$, you
    come crying. (See above.)
    7, Jul 2, 2005
  10. 7

    7 Guest

    Its S/N ratio you must look at going all the way into
    the GHz region. There are better modems coming out all the time
    and with increased LLU a market that will use it as soon as you announce
    you have made a better modem
    Thats was my entire point also.
    Any daft bugger could run a fiber to the junction box
    and save ton of money from having to maintain disintegrating
    copper wiring.
    You are just left with a few hundred yards to the house.
    Telcos do this anyway to save money.
    7, Jul 2, 2005
  11. 7

    7 Guest

    The mind boggles...
    7, Jul 2, 2005
  12. 7

    stephen Guest

    yes it can - but there is a tradeoff of cable quality, jointing, distance,
    bandwidth and interference.

    also if you want higher speed and longer distances you start needing to
    limit exactly how the link is put together - for example SDSL works faster
    and further on the same quality copper if you use 2 pairs, not one, and
    doesnt allow an analog phone on the same line.

    but your installed phone line will only have a single pair in place - which
    is why SDSL usually needs new pairs.

    So - gigabit ethernet works over Cat5 or better, needs 4 pairs per link, and
    is limited to 100 meters, and should not have any joints apart from patch
    panels at ends of the run.

    Typical BT exchange line is less than Cat3 quality, 3 to 6 Km long, and 1

    finally there is a big difference between something that works in a lab
    under ideal conditions when tweaked by a an engineer and something good
    enough to put on existing wires and is going to work without hassle or
    attention for years - and only the 2nd set of conditions is useful for a
    deployed, cheapp, reliable consumer style, low cost link.>
    stephen, Jul 2, 2005
  13. BT's SDSL is provided over a new pair so you retain your voice
    service, surely ? Though with VoIP conversion should be an option.

    Phil Thompson, Jul 2, 2005
  14. 7

    stephen Guest

    yes - cant use the existing phone line as SDSL wont co-exist with analog

    not sure whether the SDSL service uses 1 pair - AFAIK they use 2.
    stephen, Jul 2, 2005
  15. BT use one pair. They don't go in fo the higher speed/distance
    permutations that 2 pairs would allow, I think Easynet have a 2 pair

    I'm not clear why BT don't offer a conversion option from analogue or
    analogue+ADSL over to SDSL+VoIP

    Phil Thompson, Jul 3, 2005
  16. 7

    7 Guest

    They can instantly do it but haven't a clue.

    Bring on LLU and we shall see!!

    7, Jul 3, 2005
  17. 7

    Usenet Guest

    Standard telephone twisted pair can't carry Gigaherts.
    Signal to Noise is not a good way to measure how reliable a connection
    is going to be. Bit Error Rate is a far better way.

    Signal to Noise can be misleading. It is possable to have a dropout at a
    particular frequency which can cause the whole connection to drop. S/N
    won't show this BER will...
    Usenet, Jul 5, 2005
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