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Advanced Fibre Communic. (AFCI) Message Board

  • scivet scivet Jul 5, 1999 12:21 AM Flag


    mosquitoes, I'll tell you more than you want to know.

    Technology I enjoy and pick up mostly by osmosis.

    The terms I mentioned are just ones that I have read
    in the paper also. It seems to me that the future of
    broadband connectivity is still up in the air and I'm
    trying to get a sense of how it's going to shake out,
    for obvious reasons.

    I don't believe satellite
    or wireless will be the answer for the masses, at
    least not in the short term.

    I thought cable was
    a lock, but someone on this board recently posted
    some real interesting downsides to cable that I wasn't
    aware of. I'd appreciate more info from him, too. (Is
    his name Caledonia? Or is that a B.B. King

    Anyway, I thought U.S. West was incredibly foolish for
    jettisoning Media One with all it's cable only to be snapped
    up by AT&T who is now going to compete with U.S.
    West not only for Internet Access, but for local phone
    service too.

    U.S. West is I think betting on DSL,
    through the telephone line. My naive assumption is that
    the telephone line is thinner than cable, therefore
    you can cram less bandwidth info a phone line. Not so
    maybe, I would like for someone to explain. My
    understanding of U.S. West's DSL is that you have to have an
    AOL type ISP account (56K) for the uploads AND the
    DSL account for the downloads (at 256K or whatever it
    is). For $40 or $50 a month. That's not a viable
    option in my opinion.

    So that leaves what ADSL?,
    ISDN? Someone please shed some more light on these


    SortNewest  |  Oldest  |  Most Replied Expand all replies
    • Digital Subscriber Line (DSL) technology is an
      outgrowth of ISDN technology where the analog copper loop
      is turned into a digital mechanism all the way to
      the home/business.

      HDSL- Highspeed Digital
      Subscriber Line puts a T-1 on two untreated copper pairs
      (T-1's used to require special line conditioning) and
      has been around the longest (speed 1.5Mb=

      HDSL2 or HDSLII does the same thing on a single copper

      ADSL- Asymetrical Digital Subscriber Line- On one
      copper pair transmits upstream and downstream data at
      different rates- Up to 8mb downstream (depending on length
      and condition of the pair) with lesser rates
      upstream- Currently requires filters at the service point
      (translates to truck rolls for service

      Universal ADSL- aka G.Lite- same basic technology as ADSL
      but limited in downstream bandwidth to 1.5Mb- Service
      provisers love it because in most cases filters are not
      required- therefore, no truck roll.

      VDSL- Very high
      speed DSL- Provides up to 50Mb downstream according to
      copper loop length. I believe the limit is around 1500
      feet for full speed and drops off quickly as loops get

      The family of technology is sometimes referred to as

      All of the technologies are evolving rapidly,
      thereby, increasing speed and distance while decreasing
      the need for filters and truck rolls.

      this helps.

      • 2 Replies to Bull_Dolphin
      • Does anyone know how the licensing agreement with
        TLAB for
        Cablespan is structured?

        I have
        looked through the 10K and '97 and '98 annuals... I

        looked through TLAB stuff... and this is the most I have
        come up
        with (TLAB 10K):

        "The Company is
        also involved in product-oriented alliances. In

        December1996, the Company and AFC, a Petaluma, California-based

        provider of next-generation digital loop carrier
        terminated the joint venture agreement signed
        in April 1994, and
        entered into a licensing
        agreement for the development,
        manufacturing, and
        marketing of the CABLESPAN product. That
        agreement was
        modified in early 1998 to expand certain of the

        licenses and market rights. '

        H&Q shows Cablespan
        revenue to TLAB like this:
        '96: $ 4m.....'97: $
        16m....'98: $ 23m....'99: $ 75m....'00: $ 110m

        Lynch calls for '99: $ 65m....'00: $



      • technology - except with all those letters i feel
        as though i'm at the o.j.trial during the dna
        questioning!!!! All kidding aside the way you explain things we
        lay people get a general idea of what this new
        technology is all about...thanks again for imparting all
        your knowledge on the board. Also if that message
        about the cable thing is true - i'm not getting cable -
        i'll stay with the phone modem.