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SNR Margin and Line Attenuation - What do they mean?

  1. #61
    Jedi knight Luke Skywalker's Avatar
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    Rated this thread but kix .Please change definition from signal to noise ratio to power ratio between signal to noise as I said earlier. SNR long form is Signal to noise but it is not definition. It is 10 times log(base 10) of ratio of signal power to noise power.


    PS: 1. I remember this as I have just studied it in March for my communication exam.
    2.Dunno whether I gave rep or not don't want to give again for same. Tell me if I didn't , I will give to it.
    Last edited by Luke Skywalker; 17th August 2009 at 10:41 AM.

  2. #62
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    Changing to Power Ratio will confuse a lot of people as everywhere it mentioned as SNR margin.
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    Nice ! From what your comparision stats say .. my BSNL connection is outstanding
    (Probably due to the local exchange being like 400 meters away and new telephone line)

    (Downstream / Upstream)
    SNR Margin (dB): 34.0 |7.5
    Attenuation (dB): 18.0 |6.1

    Output Power (dBm): 8.8 |1.5

    Attainable Rate (Kbps): 13720|1028
    Rate (Kbps):2048 |928

    I am a bit confused about the Rate... it say 2048 or 2 Mbps and my plan is 512 kbps =\
    which Rate does that number signify =\ ? I suppose attainable rate is the max supported speed by the router.

  4. #64
    Guardian Angel just4kix's Avatar
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    ^ Attainable rate is the maximum achievable by the ADSL connection. Modem can achieve much more.

    You actual speed is better ascertained by a speedtest. Do not depend upon the modem results.
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    Oh, speed test was at speedtest.net was around .9 mbps - .4 mbps (download) and .3-.5 upload. I am veeery happy with the speeds I am getting, although I am surprised by how the dl speed goes upto 80Kbps (max till now) on torrents at times. Even when I am sharing it with another PC on the network (which also downloads stuff quite a lot), the dl speeds are consistently around 50KBps-60KBps. I thought the speeds in UL plans don't go beyond the stated dl speed.

  6. #66
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    I have upstream at a better range then downstream... Both use the same cable, if i am not wrong..
    Last edited by Admin; 28th August 2015 at 08:30 AM.

  7. #67
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    Quote Originally Posted by NARENkill View Post
    I have upstream at a better range then downstream... Both use the same cable, if i am not wrong..
    Yup you are right both use same cable.

    can you please post your Statistics -- ADSL over here will make things easier.
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    Cheers...!

  8. #68
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    Default Are my router values ideal ?

    The following are the values from my "modem status" page :

    Modem Status

    Connection Status Connected
    Us Rate (Kbps) 508
    Ds Rate (Kbps) 2042
    US Margin 24
    DS Margin 31
    Trained Modulation ADSL_2plus
    LOS Errors 0
    DS Line Attenuation 13
    US Line Attenuation 4
    Peak Cell Rate 1198 cells per sec
    CRC Rx Fast 0
    CRC Tx Fast 0
    CRC Rx Interleaved 0
    CRC Tx Interleaved 0
    Path Mode Interleaved


    DSL Statistics
    Near End F4 Loop Back Count 0
    Near End F5 Loop Back Count 0


    Please comment on whether the above values are ideal.
    (esp. the US/DS Margins & US/DS Line Attenuation).

    What US/DS Margins & US/DS Line Attenuation values
    are the best ?

    Thanks ...

    Router : D-Link GLB-502T V2 ADSL2+
    ISP & speed : BSNL DataOne; 256 kbps unlimited data transfer

  9. #69
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    Your values seem good.

  10. #70
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    Yes, they are pretty good...

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    My SNR margin varies. it is generally 7.1 downstram and 19 upstram. attenuation is 21.5(500 combo--speed Upto 2 MBPS plan). But when it rains, it goes don and starts to disconnect. What should I do? sometimes I get SNR of 14 when its not raining. So I think rain is the culprit. What will I do in monsoon yaar!

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    Quote Originally Posted by appy.djuetce View Post
    My SNR margin varies. it is generally 7.1 downstram and 19 upstram. attenuation is 21.5(500 combo--speed Upto 2 MBPS plan). But when it rains, it goes don and starts to disconnect. What should I do? sometimes I get SNR of 14 when its not raining. So I think rain is the culprit. What will I do in monsoon yaar!
    Mention your modem model and make.
    Check all contacts for oxidisation /high resistance contacts /blackening
    Use short cables.
    Change MOd mode to GDMT. Uncheck adsl2 +
    Check SNR/ATTN when it rains.
    Hasty conclusion.
    SNR will increase and ATTN will reduce !!

  13. #73
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    When looking at Line Attentuation & SNR Margin we should always look at the Downstream data for Download & Upstream for upload individually, right ?

    OR

    Does the Downstream data has any influence on the Upstream data or vice versa ?

  14. #74
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    Correct the first time. For ADSL technology, downstream and upstream rates are independent. That is what A (Asynchronous) in ADSL stands for.
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    Quote Originally Posted by just4kix View Post
    Correct the first time. For ADSL technology, downstream and upstream rates are independent. That is what A (Asynchronous) in ADSL stands for.
    hey just4kix!
    does SNR margin affect speed????
    my snr magin: 32.6 13.3
    r they right for 200+ speeds?
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  16. #76
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    SNR Margin and line attenuation do not affect speed, at least directly. They affect connectivity and up time.
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  17. #77
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    Quote Originally Posted by just4kix View Post
    SNR Margin and line attenuation do not affect speed, at least directly. They affect connectivity and up time.
    plz answer my question 2-

    my snr value- 32.6 13.3

    are these good??
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  18. #78
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    Quote Originally Posted by imrock View Post
    plz answer my question 2-

    my snr value- 32.6 13.3

    are these good??
    Have you read post # 1?
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  19. #79
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    Quote Originally Posted by just4kix View Post
    Have you read post # 1?
    i read.
    is it for only downloadstreaming or upstreaming also?
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  20. #80
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    Quote Originally Posted by imrock View Post
    does SNR margin affect speed????
    my snr magin: 32.6 13.3
    r they right for 200+ speeds?
    Just go through the image link given here, you will come to know how SNR Margin and Line Attenuation affects things.

    SNR Margin and Line Attenuation

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    Here's my SNR & attenuation :

    Remote Line Attn 12.0 dB
    Remote SNRMargin 29.0 dB

    I think its quite strong. I am already getting 3-4 Mbps speed on upto 2 Mbps plan (Home 250)

  22. #82
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    Cool

    Quote Originally Posted by anuj View Post
    Here's my SNR & attenuation :

    Remote Line Attn 12.0 dB
    Remote SNRMargin 29.0 dB

    I think its quite strong. I am already getting 3-4 Mbps speed on upto 2 Mbps plan (Home 250)
    Ho so you are getting more speed than what is being provided that's great

  23. #83
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    Quote Originally Posted by anuj View Post
    Here's my SNR & attenuation :

    Remote Line Attn 12.0 dB
    Remote SNRMargin 29.0 dB

    I think its quite strong. I am already getting 3-4 Mbps speed on upto 2 Mbps plan (Home 250)
    do u mean Mbps or MBps
    there's a lot difference between Mbps and MBps.

    b=bit
    B=byte

    1byte=8bits

    so what do u really get???
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    Nope, I do get 3/4/5 Mbps (not MBps) but it never falls below than 2.5 Mbps.
    While downloading, I get speed of around 400KB/sec.
    Last edited by Admin; 28th August 2015 at 08:30 AM.

  25. #85
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    Then also it is more than provided.
    enjoy fully what u got.
    i wish i get that much speed.
    the BSNL guys just say that ur pc is infected with virus

    Oppsss.....Lets not go offtopic.
    Last edited by Admin; 28th August 2015 at 08:31 AM.
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    Quote Originally Posted by imrock View Post
    Then also it is more than provided.
    enjoy fully what u got.
    i wish i get that much speed.
    the BSNL guys just say that ur pc is infected with virus

    Oppsss.....Lets not go offtopic.
    I guess reason behind that is telephone exchange is just 500-600 Meter away from my home.

    Just 2 minutes back, I took test & here's result is:

    Speed is lowered now but I am quite sure that it 'll back to 4 Mbps after 10 PM.

    BSNL guys 'll say whatever come in mind like virus & all that. But it actually depends on their work like porting, health of equipments at exchange. My relative (comes within same exchange of mine) also get more than promised speed on his plan & thats why I actually opted to BSNL thinking I might get same. Yeah.. I am getting it!
    Last edited by Admin; 28th August 2015 at 08:31 AM.

  27. #87
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    @anuj

    Can you post the shot of you ADSL Statistics page from your modem.

  28. #88
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    @anuj
    Please test your speed here also.
    Airtel

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    Quote Originally Posted by essbebe View Post
    @anuj
    Please test your speed here also.
    Airtel
    Tested 2 times. Both the times, it showed 3.05 Mbps speed. Attaching the screen shot:




    Speedtest.net result showing same speed. Its again back to 3-4 Mbps range as I predicted.



    Quote Originally Posted by deepmohan View Post
    @anuj

    Can you post the shot of you ADSL Statistics page from your modem.

    No problem! But the statistic page of my modem is too long. I was only able to take screen shot of limited area. I hope it contains statistic you require. If anything else, I can post.

    Last edited by anuj; 4th January 2010 at 11:09 PM. Reason: Automerged Doublepost

  30. #90
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    your stats screen shot has only snr and attenuation values, i required Downstream Rate (Kbps):

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    Quote Originally Posted by deepmohan View Post
    your stats screen shot has only snr and attenuation values, i required Downstream Rate (Kbps):
    Ok, wait for few minutes. I'll back with screen shot of required page..


    Here it is:

    Last edited by anuj; 4th January 2010 at 11:29 PM.

  32. #92
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    @anuj
    Thanks. Airtel uses about 2.6 MB of data
    Speedtest each server test will need about 15 MB.
    This info is for users without free NU plan.
    seems Airtel test is also reliable.

    PS: Please reduce the size of pictures as small as possible, , but just readable. and fits the present page.

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    Quote Originally Posted by essbebe View Post
    @anuj
    Thanks. Airtel uses about 2.6 MB of data
    Speedtest each server test will need about 15 MB.
    This info is for users without free NU plan.
    seems Airtel test is also reliable.

    PS: Please reduce the size of pictures as small as possible, , but just readable. and fits the present page.
    Yes, I have idea about this. But I have to consume my 1GB free limit within next 5-6 days. So I am not worrying about that!

    PS: 'll take your advice granted now onwards. Sorry for inconvenience as of now.

    BTW what you think about screen shot I have posted just now?
    What should be downstream/upstream rate usually?

    PS: screen shot size reduced.

  34. #94
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    @anuj

    By mistake BSNL have set your port speed to 8 Mbps instead of 2 Mbps, because of that you are getting 3 to 4 Mbps speed.

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    Yes, I have idea about this. But I have to consume my 1GB free limit within next 5-6 days. So I am not worrying about that!
    NEGATIVE
    BSNL counts usage on monthly basis 1st to 30th/31st.

    If you got the connection last mont around 8th your DEC quota is only 1024/30 x 22=
    approx 750 MB!!!
    Your usage month also changes .from 1st.
    Chargeable units less 1 GB is excess usage.

    Check usage Billed for Dec 2009.

  36. #96
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    Quote Originally Posted by deepmohan View Post
    @anuj

    By mistake BSNL have set your port speed to 8 Mbps instead of 2 Mbps, because of that you are getting 3 to 4 Mbps speed.
    Really?? How you concluded that? Is the downstream rate in modem page suggest that?

    essbebe, put light on this please!

    Quote Originally Posted by essbebe View Post
    NEGATIVE
    BSNL counts usage on monthly basis 1st to 30th/31st.

    If you got the connection last mont around 8th your DEC quota is only 1024/30 x 22=
    approx 750 MB!!!
    Your usage month also changes .from 1st.
    Chargeable units less 1 GB is excess usage.

    Check usage Billed for Dec 2009.
    I have opted in Nov 09 & it got started from 16 Nov 09. So I only got around 500 MB free in Nov. They billed correctly for that month. Rent was 125+tax for that month.

    Dec 09 bill is not yet issued, atleast I don't get it as of today. But I guess from Dec, they 'll charge as per monthly cycle starting for 1st of every month. Following I'll have 1GB free usage this month. Correct me if wrong.
    Last edited by anuj; 4th January 2010 at 11:41 PM. Reason: Automerged Doublepost

  37. #97
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    Yes . see the picture your posted.( 8187 kbps d/l)
    We get two sets. normally.

    maximum line speed ( modem's)
    and line rate. D/L U/L this depends on ISP.
    And actual(
    conditions apply!

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    Quote Originally Posted by essbebe View Post
    Yes . see the picture your posted.
    We get two sets. normally.

    maximum line speed ( modem's)
    and line rate. D/L U/L this depends on ISP.
    And actual(
    conditions apply!
    So it usually shows something around 2048 Kbps speed in modem configuration page for upto 2 Mbps plans?

    I initially thought that 8187 Kbps shown in my modem page is default value & independent of actual plan.

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    Quote Originally Posted by essbebe View Post
    Ya, got it now. So it seems I am bit lucky!
    But I guess they 'll come to know about their mistake one day mainly if I change plan.

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    @ anuj
    you are very lucky dude...i hope i could get that much of speed.
    When i was using limited 2mbps plan i used to get speed between 1.8-2.0mbps & infact MTNL exchange is also very near to my house around 600-700 meters as it is in your case so it means the internet speed also depends on the line rate/port opened to you!

    @ others
    Recently i have switched to 512kbps unlimited plan, in the beginning i used to get good speed but recently i am getting only 260-270kbps. I checked my modem and it shows Download-stream as 288kbps & Upload-stream as 260kbps.
    So it means they have decreased my line rate.....am i correct!!

  42. #102
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    Default help me

    take a look at this:


  43. #103
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    Change Mod mode to GDMT.
    Your line conditions extremely bad.
    Check for rusted /contacts/oxidization/blackening etc.
    A new pair of short rj11 cables with new contacts may help.
    seems you are far away from the Exchange .

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    Question Help Please!

    What is the Down-stream & Up-stream Line Rate for the 512Kbps (Down/Up) internet connection!!
    Currently mine is set at Down-stream is 576Kbps & Up-stream is 517Kbps by exchange!

  45. #105
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    SNR Margin (dB): 34.5 (Downstream) 27.0(Upstream)
    Attenuation (dB): 24.5 (Downstream) 11.1(Upstream)



    Router - Beetel 220BX, Plan - BSNL UL750

    Even though the values of SNR Margin and Attenuation are good I still experience frequent hanging of the modem mostly while using uTorrent,

    Meaning all 4 LED's are ON but the router is completely unresponsive(can't even ping and network activity is zero), I gave to restart the router and then things become OK,

    This happens every 10-15mins,

    Is there a problem in the router or splitter or anything else?

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    Thumbs up

    How to know or find out both.Very good post.Reps to the author

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    Quote Originally Posted by bhasker View Post
    How to know or find out both.Very good post.Reps to the author
    Go to http://192.168.1.1, enter username and password as admin, admin. then go to DSL STATUS to check it out.

  48. #108
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    Click this link http://192.168.1.1/

    Enter both ID and password as admin. In some cases, password is password or root.

  49. #109
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    Thank you. Welcome to India Broadband Forum.

    You can find the SNR Margin/Line Attenuation in the same page of the modem's summary pages. Different modems have different menus - so difficult to say.

    BTW, how did you find us here? Please stay put and contribute.
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    Thumbs up

    This is what was displayed.I cannot interpret the data.Can someone help me out.
    Mode: ADSL2+
    Line Coding: Trellis On
    Status: No Defect
    Link Power State: L0

    Downstream Upstream
    SNR Margin (dB): 34.0 28.8
    Attenuation (dB): 16.5 7.8
    Output Power (dBm): 12.3 2.1
    Attainable Rate (Kbps): 17267 1333
    Rate (Kbps): 2045 509
    MSGc (number of bytes in overhead channel message): 72 15
    B (number of bytes in Mux Data Frame): 24 5
    M (number of Mux Data Frames in FEC Data Frame): 1 8
    T (Mux Data Frames over sync bytes): 2 8
    R (number of check bytes in FEC Data Frame): 16 16
    S (ratio of FEC over PMD Data Frame length): 0.4147 3.1801
    L (number of bits in PMD Data Frame): 791 161
    D (interleaver depth): 64 8
    Delay (msec): 6 6

    Super Frames: 277047 275960
    Super Frame Errors: 0 55140
    RS Words: 43219406 1255140
    RS Correctable Errors: 18 2264183
    RS Uncorrectable Errors: 0 N/A

    HEC Errors: 0 328699
    OCD Errors: 0 0
    LCD Errors: 0 0
    Total Cells: 21602853 2508376282
    Data Cells: 1909037 1694878548
    Bit Errors: 0 28989557

    Total ES: 0 10617731
    Total SES: 0 10599911
    Total UAS: 17 10586984

    The download speed has recently come down.

    Thanks gaggan4392

  51. #111
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    This is all what there is to know:

    Downstream Upstream
    SNR Margin (dB): 34.0 28.8
    Attenuation (dB): 16.5 7.8
    Downstream means from ISP to your modem and upstream is vice versa.
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    Arrow

    I want to know whether the figures give good connection or not.Thanks for your reply friend.Can i help the forum in any way.

  53. #113
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    Please refer to post 1 of the thread. Everything is explained.
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    Talking

    Thanks .Though i am a layman what i understood is the connection is good.Reps to you.

  55. #115
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    Quote Originally Posted by bhasker View Post
    Can i help the forum in any way.
    Yes. Certainly.

    1. Ask questions however stupid they might seem. You will find that these simple (stupid) questions are not really stupid at all. They have profound theory and concept behind.

    2. But before asking questions, please certainly do a Google search around. 95% of the time you will find the answer.

    3. Keep participating. You said that you are a novice. Everyone starts as a novice. And everyone is a novice in some field or another. Slowly from a novice, you will become an expert.

    4. Try to help. If you are not able to help people, just point to the right thread or person. People do appreciate this bit also (I tell this so often).
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    Rep added

    Downstream Upstream
    SNR Margin: 17.0 8.1 db
    Line Attenuation:19.0 12.4 db
    Data Rate: 6144 517 kbps

    How are these results??
    Last edited by Admin; 7th July 2010 at 07:32 AM.

  57. #117
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    Quote Originally Posted by mihir94 View Post
    Rep added

    Downstream Upstream
    SNR Margin: 17.0 8.1 db
    Line Attenuation:19.0 12.4 db
    Data Rate: 6144 517 kbps

    How are these results??
    Thank you.

    You SNR Margin is fair. Line attenuation is low and that is excellent. You should not be facing issues.
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  58. #118
    Sanjeev_man
    Guest

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    Quote Originally Posted by just4kix View Post
    Thank you.

    You SNR Margin is fair. Line attenuation is low and that is excellent. You should not be facing issues.
    @moderator us right the values of your line are good,
    "Frequent Disconnection"Issue may not be there,however In a month or two you may face drop down of "LINK"

  59. #119
    Bronze Member
    Join Date
    Jun 2010
    Posts
    287

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    Please look at this
    I have BSNL 500c paln 2mbps getting 180-190KB/s in torrent and avg
    210KB/s from megaupload is this good???????





    Is this ok........bsnl server is 1/4 km away.

  60. #120
    The Wizard meetdilip's Avatar
    Join Date
    Aug 2009
    Posts
    8,776

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    The speed you are getting and your values are fine. Nothing to worry.

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