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Line Attenuation

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  • 29-10-2007 4:09pm
    #1
    jester77
    Registered Users Posts: 11,264 ✭✭✭✭


    How does effect the speed of your internet connection?
    When I look at the connection stats in my modem I have a Line Attenuation of over 35 and I'm only getting half the possible internet speed available to me. The apt. I live in is old and some of the internal phone wiring look dodgy at best. Planning on moving out by the end of the year so not going to go messing about with rewiring but just wondering could this contribute to my poor Line Attenuation numbers?


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    #2
    kaizersoze
    Registered Users Posts: 7,042 ✭✭✭kaizersoze


    That attenuation figure is fine. Whats your SNR/SN Margin figure? I bet it's below 9db. Distance from the exchange generally dictates your attenuation (higher figure = further away) but signal-to-noise ratio (SNR) represents the line quality. Higher = better.


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    #3
    jester77
    Registered Users Posts: 11,264 ✭✭✭✭jester77


    Not sure where to find that figure but I have a number just under Line Attenuation that shows Noise Margin of 6db.

    Found a screenshot of my details that I had here:


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    #4
    Sponge Bob
    Banned (with Prison Access) Posts: 25,234 ✭✭✭✭Sponge Bob


    its not enough for 6mbits , 4.4db margin :eek:

    maybe downgrade to 5 and then maybe 4 and see if that margin goes above 10db ??


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    #5
    jester77
    Registered Users Posts: 11,264 ✭✭✭✭jester77


    Sponge Bob wrote: »
    its not enough for 6mbits , 4.4db margin :eek:

    maybe downgrade to 5 and then maybe 4 and see if that margin goes above 10db ??

    Sorry to be ignorant :o but what does the 4.4db mean? Is there a way to increase this number or why could it be so low? I'm supposed to have a theoretical max of 16,000 kbps if all conditions were ideal. As it is, everything works fine and I've never had an issue with it and the speed is good enough for me but I'm getting a lot less than what I could be getting.


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    #6
    Sponge Bob
    Banned (with Prison Access) Posts: 25,234 ✭✭✭✭Sponge Bob


    My advice is disconnect EVERYTHING , including filters, and run those line stats again with only the modem plugged in

    Your margin must be in the range 8-10db to be sustainable at THAT speed , otherwise the speed should drop to give a sustainable margin

    If the speed does not drop to sustainability you get instability.


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    #7
    jester77
    Registered Users Posts: 11,264 ✭✭✭✭jester77


    Sponge Bob wrote: »
    My advice is disconnect EVERYTHING , including filters, and run those line stats again with only the modem plugged in

    Your margin must be in the range 8-10db to be sustainable at THAT speed , otherwise the speed should drop to give a sustainable margin

    If the speed does not drop to sustainability you get instability.

    OK, I'll do that tonight when I get home. Thanks for the replies!


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