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Line Attenuation

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  • 16-06-2007 2:01pm
    #1
    highlydebased
    Registered Users Posts: 7,468 ✭✭✭


    Just wondering if someone can tell me what this is exactly.......the router homepage currently shows my connection 55/31 dB

    Its confusing a bit :confused::confused::confused:


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    #2
    meathman 007
    Closed Accounts Posts: 797 ✭✭✭meathman 007


    are you on the 1mb or the 2mb connection...?


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    #3
    highlydebased
    Registered Users Posts: 7,468 ✭✭✭highlydebased


    2mb


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    #4
    meathman 007
    Closed Accounts Posts: 797 ✭✭✭meathman 007


    from what ive been told, you are borderline 2mb like me - my stats are:

    Downstream Upstream
    Max Allowed Speed (kbps) 2048 256
    SN Margin (dB) 11.50 19.00
    Line Attenuation (dB) 49.50 31.00
    CRC Errors 3 2


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    #5
    highlydebased
    Registered Users Posts: 7,468 ✭✭✭highlydebased


    .............................so the closer to the exchange the less attenuation?


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    #6
    meathman 007
    Closed Accounts Posts: 797 ✭✭✭meathman 007


    yes i think that is one of factors....


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    #7
    dub45
    Moderators, Technology & Internet Moderators Posts: 12,448 Mod ✭✭✭✭dub45


    If you do a search you will find at least one recent thread on this with several links to explanations of attenuation etc.


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    #8
    lucernarian
    Registered Users Posts: 9,235 ✭✭✭lucernarian


    Neon-Circles wrote:
    Just wondering if someone can tell me what this is exactly.......the router homepage currently shows my connection 55/31 dB

    Its confusing a bit :confused::confused::confused:
    This is how much the signal is weakened by the line. It gets progressively higher as the line gets longer, and this is why broadband wont work on lines. Eircom dont take orders on lines with attenuation higher than about 78. With 55 attenuation, your line is about 4.5 km long.

    If you go into expert mode and check statistics and go to DSL, or something along those lines, there are more details. You will see two numbers called SNR. If this is less than 12, there may be problems with your connection. Your line speed is fine regardless of attenuation so long as the SNR number is bigger than 8.


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    #9
    towel401
    Closed Accounts Posts: 2,917 ✭✭✭towel401


    Neon-Circles wrote:
    .............................so the closer to the exchange the less attenuation?

    yea i'm about 250 meters away from the exchange my attenuation is 10 / 8db


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