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Thread: ISDN Vs ATM

  1. #1

    ISDN Vs ATM

    as i have studied that both ISDN and ATM integrate voice, video, audio .....etc over a communication network.
    what is the difference between these two?

  2. #2
    Administrator Philip's Avatar
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    ISDN is a circuit switched (fixed bandwidth) point to piont communication.
    ATM is a packet switched (variable bandwidth) communication.

    I hope this helps
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  3. #3
    thanks anyway
    but this much i did know
    I meant to ask....in modern internetworking where exactly ATM and ISDN are used?

    any difference between there applications?

  4. #4
    Moderator YeOldeStonecat's Avatar
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    ISDN = Is Still Does Nothing!

    Why pay all that for barely twice dial up speeds, when for usually less than 25% of the cost..you can get broadband...many times faster and more reliable.

    Not really used anymore since broadband come out.....gone the way of the 9 pin serial port and floppy drives....nearly extinct!
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  5. #5
    R.I.P. 2017-10-02 Joint Chiefs of Staff's Avatar
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    Quote Originally Posted by YeOldeStonecat View Post
    ISDN = Is Still Does Nothing!

    Why pay all that for barely twice dial up speeds, when for usually less than 25% of the cost..you can get broadband...many times faster and more reliable.

    Not really used anymore since broadband come out.....gone the way of the 9 pin serial port and floppy drives....nearly extinct!
    When I worked the data center for Aliant Telcom ISDN was still used on widescale networks. The #1 reason was cost deployment for larger customers where bandwidth was not an issue.
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  6. #6
    Moderator YeOldeStonecat's Avatar
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    Quote Originally Posted by Joint Chiefs of Staff View Post
    When I worked the data center for Aliant Telcom ISDN was still used on widescale networks. The #1 reason was cost deployment for larger customers where bandwidth was not an issue.
    Back when 14.4 modems were the norm eh? You old fart you!
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  7. #7
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    ISDN is still used heavly for video confrencing. And does it very well ... much better then IP, unless you and the other part have very high bandwidth, and managed QOS.

    3x ISDN is very common for video confrencing. Two data channels, and one backup.

    ISDN is also used as trunking lines for voice, ISDN PRIs (1.5mb 23x 64k + 1x 8k) are VERY common.

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