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7MB Broadband

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  • 07-01-2010 1:59pm
    #1
    markmcg
    Registered Users Posts: 148 ✭✭


    Is 710 KB/s the correct download speed for a 7MB connection?


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    #2
    si_guru
    Registered Users Posts: 2,347 ✭✭✭si_guru


    No... but if you are in a remote location like me then it's the best you will get... I am lucky to see 500K.

    I pay for 7Mb to get the largest download limit.


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    #3
    Altreab
    Registered Users Posts: 667 ✭✭✭Altreab


    markmcg wrote: »
    Is 710 KB/s the correct download speed for a 7MB connection?

    It all depends how close you are to the exchange and what time of day your testing the speed. It sounds about right for someone about 2KM from the exchange. Remember that 7MB speed is an "upto" speed not an actual speed.


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    #4
    markmcg
    Registered Users Posts: 148 ✭✭markmcg


    I'm just under 3KM from exchange.


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    #5
    watty
    Registered Users Posts: 32,417 ✭✭✭✭watty


    Becareful of B and b
    Files are measured in Bytes B
    Connections are measured in bits b, there are 8 bits per Byte.
    but line speed and File transfer don't exactly measure the same thing.

    A 710MByte/s file transfer speed is reasonable for a 7Mbps (bits/s) line.

    Also really only Memory Mbytes (really MiBytes) is 1024x1024. An ISO "M" is 1000x 1000 and ISO "m" = 1/1000th
    Many lines speeds and some file measuring applications count properly (1000, 1,000,000 & 1,000,000,000). Memory can only be added in chunks of powers of 2. Ten bit address = 1024 values. Thus 2GB Ram is really 2 GibiByte = 2x 1024 x1024 x1024 = 2,147,483,648 Bytes. A 2GB HDD is likely 2 x 1000 x 1000 x1000 = 2,000,000,000 Bytes, or if you count in RAM type powers of 2 you get 1.863 GibiByte approx.

    You are not "cheated" on your HDD. It's just a lot of stupid programmers count in 1024s (10th power of 2) instead of properly in decimal like the rest of the world.

    That complication and the "overhead" of doing communication means the file transfer speed never matches your line speed. Also ALL domestic connections are contented at 10:1, 24:1, 48:1 etc... so it's really an "up to speed".

    If your speed is more than 30% low you have highish contention. If it's 50% low your line is poor or not good enough for the package you on.

    Multiply your File Transfer Bytes by 10 rather than 8 on DSL for a realistic comparison.


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    #6
    markmcg
    Registered Users Posts: 148 ✭✭markmcg


    My Line Attenuation 40/21 dB. Is that what making my download speed slower?


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