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    cnolte's Avatar
    cnolte Posts: 2, Reputation: 1
    New Member
     
    #1

    Feb 27, 2009, 01:17 PM
    Dial-up speed
    Hi there
    I have got a dial-up connection and to download something goes at about 4kb/s.
    Is this normal or is my computer or service provider responsible ?
    Thanks for your help
    Claus
    Scleros's Avatar
    Scleros Posts: 2,165, Reputation: 262
    Hardware Expert
     
    #2

    Feb 27, 2009, 03:51 PM
    Dialup connections using v.90 or v.92 compliant analog modems have a theoretical downstream maximum bandwidth of around 56 kilobits per second, or 56/8 = 7 kiloBytes per second (8 bits = 1 Byte). Phone lines usually aren't perfect enough to achieve this maximum, so connections are typically in the 40-50 kbps range or less which is 5-6 kBps. When protocol overhead is then considered, actual real throughput can indeed be around 4 kBps. However, if you meant 4 kilobits per second, then yes, you have a severe problem.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
     
    #3

    Feb 27, 2009, 06:43 PM

    Watch the b's and the B's. b is a bit and B is a byte.

    For dial-up a character takes up 10 bits. 1 start, 8 bits and 1 stop bit, so there is a lot of overhead.

    In order for a 56 K modem to work at max speed, you need an ISDN line at the other end.

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