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Getting slow speed and attainable rate low.

  1. #1
    Junior Member
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    Jul 2013
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    Default Getting slow speed and attainable rate low.

    Hi everyone,
    Recently i switched to BBG speed combo 2799 plan which commits bandwidth upto 8 mbps for better speed.But the speed i am getting is max 1-1.5 mpbs(as per speedtest.net).I have tearcom modem(type2).The problem is when i switch from ADSL2 to GDMT snr margin increases.But data rate drops. Here i am giving screenshot in GDMTconfig_1.jpg.
    Now attaching config in ADSL mode.config_2.jpg.
    You can easily see that line attenuation high >51. Total distance from exchange is about 3.5 km.
    My question are
    1. Why i am getting such slow speed in a 8 mpbs connection.
    2. Why snr margin changes in changing mode though line attenuation remains same.
    3. Is it a problem of router.
    I also complaint SDOT,BSNL and they said its the distance which causes this.though Jto BSnl told that its a line problem.Also BSNL SDOT is so rude that he told to change the plan or cancel broadband connection.

    Please suggest me what to do.I am now helpless.I don't want to cancel or change the plan as there is only BSNL in my area.

    Thanks in advance.

  2. #2
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    Default

    Please someone respond

  3. #3
    Bronze Member
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    Default

    SNR will change if there is a change in the noise picked up by the copper cable. However, Line attenuation is caused by distance, joints, and proximity (of the line and your equipment) to other high frequency sources.

    The 3.5 Km line will definitely NOT support 8mbps. About 4 mbps should work fine. Remember that its NOT the line of sight distance from the DSLAM (exchange or central office) that comprises the Loop Length. The Loop Length is generally about the distance + 2 to3 %. since there are a number of long cuts that the bsnl cable has to take around buildings, through gutters and other geographical features to reach you. I believe that you should be fine with a 3 or 4 mbps plan.

  4. #4
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    Can someone please tell me why attainable rate is 1920 kpbs instead of 8192(8Mpbs).

  5. #5
    Bronze Member
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    Quote Originally Posted by nunudada View Post
    Can someone please tell me why attainable rate is 1920 kpbs instead of 8192(8Mpbs).
    why do you think that that figure is the attainable rate? its basically a calculation using the ping time from your modem to the dslam and back.
    The actual sustainable (and not attainable) data transfer rate calculation is done using the SNR and Line Attenuation ratios. When SNR falls below a certain limit and Attenuation rises, then they lower data rate for that loop length, and so on, until the lowest figure of 256 kbps is reached. Beyond this length, is the last mile of connectivity.

    Cheers!

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