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ISDN D-Channel

  • 18-01-2004 1:09am
    #1
    DaemÈn
    Closed Accounts Posts: 36 ✭


    Just wondering if any1 knew whether any of our isdn providers will ever route the D channel to the internet (with a lower priority than the signaling of course) ? i have heard that it is done in some other countrys... even though it is only 16k, the D-channel is not billed (by usage) and could be used for email etc...any one ever hear anything about this in ireland - or exactly how it works elsewhere ?


    DaemÈn


Comments

  • #2
    spongebob
    Closed Accounts Posts: 6,143 ✭✭✭spongebob


    Its called midband (not Broadband :D) and is Basic rate ISDN kludgel

    It allows a trickle of data down the 16kbit D channel in addition to the norma signalling data on the D channel. I suspect that the trickle can include command to open one or both on demand.

    It is frequently mentioned as a panacea for rural areas or for the fringes of an exchange area .

    Telephones exchanges cover an area of about 8km Radius. RADSL can work out to 6Km so the solution for the other (outermost) area is Midband or else IDSL which also uses an always on D channel except that D and 2 B channels are always open
    IDSL can work out to about 7Miles if needs be and will shortly be capable of ADSL speeds.

    IDSL DESCRIPTION
    IDSL is the DSL equivalent of ISDN, a digital, dialup 128K connection offered by the telephone company. IDSL runs at 144K downstream and upstream. IDSL offers an always-on connection for a flat rate. It is a faster and more convenient product with much lower costs. Most importantly, IDSL works in many situations where nothing but dialup is available. It can travel much longer distances – 36, 000 feet versus 18,000 for ADSL and SDSL. And it works over fiber. IDSL is high-speed access for a fraction of the cost of a traditional ISDN line. For those who can’t get other kinds of DSL, IDSL offers good speed and reliability.


  • #3
    po0k
    Registered Users, Registered Users 2 Posts: 15,817 ✭✭✭✭po0k


    Afaik Germany is one country where they supply a net conn over the D-channel.
    Runs at about 12Kbit/sec, and prices I heard quoted were a tenner a month or something, but I assume that was quite a while ago as 512/128 broadband is far far cheaper in bit-for-cent comparison.


  • #4
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 93,552 Mod ✭✭✭✭Capt'n Midnight


    AFAIK Esat used to use it to dequeue email - ie when mail arrived in their server you got notified on the D channel - the idea being you'd then dial up up to collect it. But then you could let the email trickle down with out calling... So it was disabled.

    It would be great for bandwidthl on demand while allowing email to happen in the background.


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