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ADSL overhead = how much % lost?

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  • 15-08-2008 7:46pm
    #1
    Uthur
    Registered Users Posts: 414 ✭✭


    i've been upgraded to 7.6 Mbit/s by BT
    i was on 3 MBit/s before

    in theory how fast could my downloads
    be now?

    i was seemingly losing 16.8% of the
    theoretical max before due to protocol
    overhead etc. this seems to be now 18.4%
    since the upgrade.

    how much % should you lose with adsl anyway,
    or how fast does 7.6 Mbit/s actually go in the
    real world :D


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    #2
    PogMoThoin
    Closed Accounts Posts: 13,874 ✭✭✭✭PogMoThoin


    Here, download this, choose Ireland, HeaNet, tell us what speed your getting after few mins. This will fill your bandwidth. No point doing it now at this hour of the evening, do it after 12 or in the morning.

    FYI, I live 200-300m from exchange and I'm getting 6.4-6.5mbit on speedtests or ~750kbps from this server, but not at this hour of the evening.


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    #3
    Uthur
    Registered Users Posts: 414 ✭✭Uthur


    i can download from heanet and other fast sites
    at 775 KB/s - is this as much as can be expected
    from 7.6 Mbit/s ? :o

    309839549.png


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    #4
    PogMoThoin
    Closed Accounts Posts: 13,874 ✭✭✭✭PogMoThoin


    Yes, multiply by 8 to get bits (8 bits in a byte) = 6200 kbps


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    #5
    MrVestek
    Registered Users Posts: 9,213 ✭✭✭MrVestek


    Uthur wrote: »
    i can download from heanet and other fast sites
    at 775 KB/s - is this as much as can be expected
    from 7.6 Mbit/s ? :o

    Erh why are you complaining? You're getting slightly more than 7.6Mbps.


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    #6
    PogMoThoin
    Closed Accounts Posts: 13,874 ✭✭✭✭PogMoThoin


    309796856.png

    Thisis what i get off-peak, I'm a stones throw from the exchange so this is the max you can expect


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    #7
    Uthur
    Registered Users Posts: 414 ✭✭Uthur


    PogMoThoin wrote: »

    Thisis what i get off-peak, I'm a stones throw from the exchange so this is the max you can expect

    309839549.png

    i make this 833 KB /s - i'm not sure why it would be so much faster than
    heanet :confused:


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    #8
    PogMoThoin
    Closed Accounts Posts: 13,874 ✭✭✭✭PogMoThoin


    Because speedtest is not accurate, the ping times are way off also. Only accurate way of measuring download speed is to start a download and see what average speed your getting from a fast server, which is why I asked you do this.


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    #9
    MrVestek
    Registered Users Posts: 9,213 ✭✭✭MrVestek


    PogMoThoin wrote: »
    Because speedtest is not accurate, the ping times are way off also. Only accurate way of measuring download speed is to start a download and see what average speed your getting from a fast server, which is why I asked you do this.

    Yup, most speed testers can be inaccurate as the servers might be overloaded themselves in the first place which impacts the results of the test.


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    #10
    Jonathan
    Moderators, Education Moderators, Home & Garden Moderators Posts: 8,159 Mod ✭✭✭✭Jonathan


    The effective download speed is about 85% of total speed.


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    #11
    Uthur
    Registered Users Posts: 414 ✭✭Uthur


    jmccrohan wrote: »
    The effective download speed is about 85% of total speed.


    thanks jmc! as best i can determine, you are entirely correct ;)


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