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Thread: What is the difference between ISDN and ADSL (Telkom)

  1. #1

    Default What is the difference between ISDN and ADSL (Telkom)

    Please can you help us with this issue!!

    We are having great debates in our technical ignorance.

  2. #2
    Super Grandmaster PostmanPot's Avatar
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    ISDN still uses normal call charges per minute/R7 call plan, ADSL is one fixed monthly fee for 24 hour internet.

    ISDN comes in 64k and 128k (you will have to pay for two calls to get 128k), ADSL comes in 192k, 384k and 512k.

    ISDN is "uncapped" so you can download as much as you want, ADSL is normally capped from between 2gb of downloads to 30gb of downloads, unless you can afford uncapped.

    speaking of which, Web Africa have a new promotion for myADSL members.. 30gb cap + ISP charges for R199 p/m.

    peace

  3. #3
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    Integrated Services Digital Network. A switched network providing end-to-end digital connectivity for simultaneous transmission of voice and/or data over multiple multiplexed communications channels and employing transmission and out-of-band signaling protocols that conform to internationally-defined standards.

    -

    ADSL (Asymmetric Digital Subscriber Line) is a technology for transmitting digital information at high bandwidths on existing phone lines. Unlike regular dialup phone service, ADSL provides a continously-available connection. ADSL is asymmetric in that it uses most of the channel to transmit downstream to the user and only a small part to receive information from the user. ADSL simultaneously accommodates analog (voice) information on the same line. ADSL is generally offered at downstream data rates from 512 Kbps to about 6 Mbps.

    From google.

    Probably the most noticable difference is that the one is dialup and the other is an "always on" connection.
    Last edited by YAPOC; 24-07-2005 at 01:15 PM.

  4. #4
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    isdn as far as i know is also unshaped, adsl accounts come standidly shaped but for a bit more u can get unshaped

  5. #5
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    Quote Originally Posted by Silent_Bob
    isdn as far as i know is also unshaped, adsl accounts in South Africa with Telkom come standidly shaped but for a bit more u can get unshaped
    Fixed.

  6. #6
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    heh

  7. #7
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    ADSL modulates a digital signal onto a high frequency portion of your phone line. The difference between this is that the signal is added and removed (at the DSLAM) before the analog line is terminated into the exchange. With modem the limiation is that the signal is carried as a voice portion, switched through the exchange (at around 46Khz iirc)

    ISDN is a digital switched line end to end - each line is 64Kbit/s (two bonded for 128K). Stuff like diginet is a bunch of multiplexed 64Kbit lines. ISDN uses HDLC frames, ADSL uses ATM frames.

  8. #8

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    ISDN: Dial up
    ADSL: 24/7 connection
    E8400 E0 @ 4.0Ghz | TT Typhoon VX | GA-P35-DS3L | Transcend 2 x 2GB DDR2-800 | Gigabyte 9600GT @ 800Mhz Core| 2 x 1TB HDD | CM 650W PSU | GZ-X1 | T260

  9. #9
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    ADSL is better

  10. #10

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    if its available in your area
    "If the ANC does to you what the apartheid government did to you, then you must do to the ANC what you did to the apartheid government." Nelson Mandela

  11. #11

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    ISDN is better for international latency if you're into online gaming on overseas servers.

  12. #12

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    Errrr not true.

    Unshaped ADSL latency is slightly lower than that of ISDN

    EDIT: Internationally that is - ADSL is obviously unshaped locally, so the latency on any ADSL is lower than ISDN to local servers

  13. #13

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    In my experience if you are using it for anything to do with voice, ISDN seems to be better...not sure what the reason is but thats the way it has been for me

  14. #14
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    ADSL = cool
    ISDN = not cool
    Please save trees and think twice before printing this post.

    Looking for a VPN, read my reviews at vpn-reviews.net

  15. #15

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    Quote Originally Posted by James
    ADSL = cool
    ISDN = not cool
    Correction:

    ISDN = cool when you can't get friggin ADSL!

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