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SNR Margin and Line Attenuation - What do they mean?

  1. #121
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    Default Snr margn

    Dear Friend.......

    i Have problem Plz see my screen shot my Bsnl broadband plan is 2799 8Mbps but speed only 1.5Mb or 800Kbps

    plz help Attachment 7547

  2. #122
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    Try this guide

    http://www.indiabroadband.net/broadb...onnection.html


    Get your line checked by the line man. Ask him to remove the cables that have joints and lay a good one.

  3. #123
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    @rhtdm
    check whether Annex M has been enabled. select Mod mode Adsl2 +

  4. #124
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    My lineàs status

    SNR (Downstream) 10.5 dB
    SNR (Upstream) 13.5 dB
    Line Attentuation(Downstream) 21.5 dB
    Line Attentuation(Upstream) 11.0 dB

  5. #125
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    Quote Originally Posted by juno View Post
    Very very informative, tonnes of thanks for the knowledge just4kix

    i have a couple of naive queries -

    It would be fascinating if anyone could explain & illustrate the difference between the quantitative terms, kbps, kBps, Mbps, MBps etc (is there anything like Gbps & GBps etc? )

    i use BSNL DataOne Broadband Home UL 750 plan. In my modem configuration page under Device Info i have these values -

    Line Rate - Upstream (Kbps): 864
    Line Rate - Downstream (Kbps): 5286

    When i download using uTorrent (currently using version 2.0), i get Down Speed of 52-56 kBps but usually the average is 42-45 kBps. These speeds keep fluctuating between the average & sometimes hits as high as 59.7-62.1 kBps.
    Is this normal? i understand downloading through torrents is dependent on various factors such as the number of seeders etc.
    Also, one peculiar observation that i have noticed is, the icon on the status bar of uTorrent keeps changing. As of now, while i type this post, it is the Yellow Triangle, after sometime it changes to the Green Circle & at times it changes to the scary Red Circle.

    i know my queries are rather stupid & naive but with all humility & honesty i am open & willing to learn & gain knowledge from all of you my Friends.
    kbps = kilo bits per second
    kBps = kilo bytes per second

    1 byte = 8 bits. For example, if plan speed is 512 kbps, your computer will show the speed in kBps as 64 kBps.

    Same applies to Mbps and MBps.

    -----

    Your plan is UL750. iN this plan, your max speed is 512 kbps or 64 kBps. But that is the theoratical maxuimum and that speed is promised from your computer to the BSNL server only. In reality, you may get lesser speed while surfing or downloading. This is because there are many factors involved such as network congestion, peer ratio, line contention ratio, the congestion at the source website, etc.

    For all torrent related queries, refer to Torrents and Port Fowarding Guide
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  6. #126
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    mine is a Adsl2+(AnnexA).... what does that mean and what do u mean by check if it is enabled

  7. #127
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    Angry combo 900 speed sucks....!!!!

    hello everyone
    this is really informative section on bb connection thanks for all input.

    i had ul 750 and recently updated to combo 900 but since the my bb sucks big time cant even get 256kb speed plesese have look at my stats bello and suggest me way forward if u can

  8. #128
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    .1.Disable ADSL2+ and enable GDMT.
    .. 2.Recheck SNR/Attn data. SNR should improve and Attn decrease.
    .....3 Post modem/model/make/number.
    ......4. Download tcp/Ip optimizer from speedguide.net
    ........... Select default values.
    .............5. Check speed here and give report.
    ...................6. SNR/ATTN details here.
    wait...
    Last edited by Admin; 28th August 2015 at 08:32 AM.

  9. #129
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    Get your line checked by the line man. Values are not so good.

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    Talking Hows that possible...!!!!!

    this is funny now... my SNR values changed since yesterday.... hows that possible now.... and moreover i am getting much better speed today
    Last edited by desikid123; 31st October 2010 at 12:43 AM. Reason: adding attchment

  11. #131
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    that probably maybe due to some thing with your lines..


    is it higher side or lower?
    job takes the child away.

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    @essbebe:
    can u tell me how can 'Disable ADSL2+ and enable GDMT'
    thanks

    to higher side bro.... i'm surprised actually how can this happen
    Last edited by desikid123; 31st October 2010 at 12:50 AM. Reason: Automerged Doublepost

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    1.Disable ADSL2+ and enable GDMT.------- Pending
    .. 2.Recheck SNR/Attn data. SNR should improve and Attn decrease.
    .....3 Post modem/model/make/number. AN1020-20
    ......4. Download tcp/Ip optimizer from speedguide.net
    ........... Select default values. NO IMPROVEMENT
    .............5. Check speed here and give report.
    ................http://myboroadbandspeed.co.uk PENDING
    ...................6. SNR/ATTN details here. latest needed.
    Last edited by essbebe; 31st October 2010 at 07:26 AM.

  14. #134
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    Arrow

    here it is .... i even tried to use optimiser as u suggested but of no use .... check out the attachment
    thanks again

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    Reply to item No 5 & 6
    1.Disable ADSL2+ and enable GDMT.------- Pending : Check DSL Home.
    .. 2.Recheck SNR/Attn data see 6.
    .....3 Post modem/model/make/number. AN1020-20
    ......4. Download tcp/Ip optimizer from speedguide.net
    ........... Select default values. NO IMPROVEMENT
    .............5. Check speed here and give report.
    ................http://myboroadbandspeed.co.uk PENDING
    ...................6. SNR/ATTN details here. latest needed
    Last edited by essbebe; 31st October 2010 at 08:34 AM.

  16. #136
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    these are my ratios...my plan is a 2mbps one... but i am getting the speed of 600kbps only...

    Mode: ADSL2
    Line Coding: Trellis On
    Status: No Defect
    Link Power State: L0

    Downstream Upstream
    SNR Margin (dB): 10.1 11.0
    Attenuation (dB): 57.0 34.7
    Output Power (dBm): 12.6 11.5
    Attainable Rate (Kbps): 1244 756
    Rate (Kbps): 600 655
    MSGc (number of bytes in overhead channel message): 61 106
    B (number of bytes in Mux Data Frame): 18 13
    M (number of Mux Data Frames in FEC Data Frame): 8 16

    what should i say the lineman.... is it the problem with the line or something....

    what to tell the office..?
    Last edited by karthi4052; 16th March 2011 at 06:58 AM. Reason: Automerged Doublepost

  17. #137
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    Uncheck ADSL2, try GDMT.

    Your SNR and Attenuation values are poor. Indicates bad line condition. Take a print out of your SNR and Attenuation values and ask the line man to fix the line. Ask him to remove joints and non insulated/rusty parts. You can also take a print out of the following table


  18. #138
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    Thanks just4kix a concise and good article explaining both the points SNR Margin and Line Attenuation in detail.
    Last edited by fardeen; 23rd March 2011 at 06:24 PM. Reason: spelling mistake
    Check out my blog
    http://fardeen.in

  19. #139
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    Default السلام عليكم ورحمة الله وبركاته

    help



    Downstream Upstream

    SNR Margin

    : 21.0 31.0 db

    Line Attenuation

    :
    60.5 27.5 db

    Data Rate

    :
    512 128 kbps

  20. #140
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    How far are you from the exchange ? Ask the line man to check the line. If possible, meet the SDE in person and seek help.

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    tell me this's good or not

    Downstream Upstream

    SNR Margin

    : 21.0 31.0 db

    Line Attenuation

    :
    60.5 27.5 db

    Data Rate

    :
    512 128 kbps

  22. #142
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    Quote Originally Posted by mansawy View Post
    tell me this's good or not
    I thought you will be attentive enough to check the previous post to your thread. It is explained here




    Attenuation is high.Which normally happens when your location is a bit far from exchange.

  23. #143
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    Reproduced from thread UDAAN.
    LINK back: http://www.indiabroadband.net/bsnl-b...tml#post330317
    By @whitestar_999
    @meetdilip,i hope you won't mind me correcting some of the common myths surrounding SNR & Line attenuation values here & since you are a frequent & reputed poster i am hoping you will spread this.

    first of all simply saying high SNR value in any situation is good is incorrect.besides line condition SNR value also heavily depends on the rate at which your modem syncs with the DSLAM in exchange.that is why in many european countries/usa where people use 16-24mbps plans their snr values are usually 10-15.in india most bsnl users syncs at ~2mbps so here snr ~30 or more can be considered as good but if & when user start syncing at 8mbps or higher this does not hold true.

    Quote:
    from a known australian broadband forum:

    Dont understand why people are saying that a snr over 30 is good when i can download at 2.35mb/sec and my snr is well and truely below 30
    Sync speed down 23500 up 1000
    snr down 4.5db up 9db
    att down 8.5db up 6.5db
    also the chart you used for attn values is not correct.again from the same forum as mentioned above:
    attn values & expected speeds
    Fremnet.net
    1.0km = 13.81dB = 23Mbit
    1.5km = 20.7dB = 21Mbit
    2.0km = 27.6dB = 18Mbit
    2.5km = 34.5dB = 13Mbit
    3.0km = 41.4dB = 8Mbit
    3.5km = 48.3dB = 6Mbit
    4.0km = 56dB = 4Mbit
    4.5km = 62.1dB = 3Mbit
    5.0km = 69dB = 2Mbit

    my downstream attn is 42 & i get usual ~1.8mbps speed on 500C plan while modem reports max attainable rate as 8mbps.one more important thing to keep in mind is that different modems report different SNR & attn values because of the difference in their calculating method.my nokia c2110 modem reports attn as 36 while my TP-LINK modem reports downstream attn as 42 on same line.
    @meetdilip
    try this tool for finding distance to Exchange and theoretical speed.
    ( Note KBits)

    Fremnet.net
    Last edited by essbebe; 27th June 2011 at 11:24 AM. Reason: Automerged Doublepost

  24. #144
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    Here



    Exchange is about 300 m from my home.

  25. #145
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    @meetdilip

    Since we have Home 750 plan max 512 Kbps speed ,
    again verify the sync rate/rate as shown in different
    modems with different mod modes.

    Instead of groping in the dark, applications and data like these
    help non tech users like me to try something to improve speed,
    short of selling present house and buying a new house near the exchange !!
    for best ATTN SNR figures and good speed!!

  26. #146
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    SNR is a bit low. Do you hear hissing sound on your land line ? Talk to the line man. Ask him to give a clean line. Make sure there are no joints or non insulated parts. It is better handled as line man level. If still no change, talk to the SDE.

    This may help

    http://www.indiabroadband.net/broadb...ubleshoot.html

  27. #147
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    SNR Margin (dB): 7.7 (Downstream) 13.8 (upstream)
    Attenuation (dB): 51.0 ((Downstream)) 32.4 (upstream)
    Output Power (dBm): 12.9 ((Downstream)) 0.0 (upstream)
    Attainable Rate (Kbps): 5300((Downstream)) 876 (upstream)
    Rate (Kbps): 2044((Downstream)) 874 (upstream)

    What does this rating shows???
    i am having frequent dsl break.....doi need a line change???

  28. #148
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    If you post in an old thread , it is presumed you have read all the posts!
    then the query will not be there !
    see Post no 151.
    check with
    http://fremnet.net/article/216/adsl-...eed-calculator
    Post with details of modem number in your Isp's forum as a NEW thread.
    Last edited by essbebe; 11th August 2011 at 12:31 PM.

  29. #149
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    My specifications are


    SNR Margin (dB): 3.7 5.7
    Attenuation (dB): 53.0 35.8
    Output Power (dBm): 12.9 0.0

    With this I was getting download speed (uTorrent and also shown by bandwidthmeter) approx 190 kB/s. But then now i get only 25-30 kBps and often (for 10-15mins the full speed).So i called the lineman.He came,sees the line and after that no improvement in speed although there is no noise in my telephone.
    Please help.

  30. #150
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    Try port forwarding. Or switch to bridge mode. All ports are open by default.

    This may help

    http://www.indiabroadband.net/broadb...onnection.html

  31. #151
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    Quote Originally Posted by Rameshjeee View Post
    From the junction box,the telephone wire directly runs to my house. Its a new wire,I got it changed recently.
    I dont have any paralled connection.
    But still the SNR value is around 7~8.
    Attn Value is around 40~45.
    I do experience frequent disconnection for 10 sec...
    When the connection is there...I get the expected speed & I dont face any issues.
    According to just4kix Chart, I have the following.
    SNR value is around 7/Downstream ~ 6/Upstream.
    Attn Value is around 41/Downstream ~ 22/Upstream.


    Looking at the table My SNR = Fair but does not leave much room for variances in conditions.
    Line Attenuation = Good,

    Fair + good doesn’t sound that promising really. I never really looked into the numbers before until today, I get good speeds. Speed test around 10.5mbps, upload speeds is crap of course.

    In my mind I thought well connection running good, maybe a few drop outs from time to time other than that I assumed everything is in order But? When you look at the facts things look different on this side of the fence so to speak.

    Would be nice to see, this kind of numbers Right.

    SNR
    1. 20dB-28dB. = Excellent
    2. 29dB. or above = Outstanding

    Line Attenuation
    1. 20bB. and below = Outstanding
    2. 20dB-30dB. = Excellent


    I think all of us who has read this thread will think the same Yes, So how do we improve the numbers on the router is it a router issue, is it a ISP issue, or just the line itself, what can we do ourselves to make it better, any thoughts or suggestions.


    Twisted.

  32. #152
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    If you are in Australia , the ISP may be contacted.
    Mention adslmodem/make/number.

  33. #153
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    I feel SNR is a bit low and Attenuation a bit high. Get you line fixed. Make sure there are no joints, non insulated / non oxidised parts. Inspect manually and make sure that the line is clean.



    This chart may be a bit inaccurate for speed above 8 Mbps.

  34. #154
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    What do my stats say here?
    Why Output Power is so low here. Sometimes its negative !!




  35. #155
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    Update from @amasoun after trying different mod modes.
    http://www.indiabroadband.net/bsnl-b...tml#post343180

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    Nice Post but how to find SNR?

  37. #157
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    please tell your modem name and model No.

  38. #158
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    Ut300r2u bsnl broadband.

  39. #159
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    prntscr .com /7eyql img of my SNR.Please help.

  40. #160
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    Quote Originally Posted by Toxicated Shehzada Namit View Post
    http://prntscr.com/7eyql img of my SNR.Please help.
    Your values are good. If you are getting slow speed complain @ http://mis.bsnl.co.in/pgs/internet/pgwebregn.asp or 1504

  41. #161
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    they don't take any action i reported it many times but they are not fixing it.thats y i hate bsnl.

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    did you complained online?

  43. #163
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    Which is best ADSL1 or ADSL2+..and on which technology the BSNL BB works

  44. #164
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    well i just complained about it when will they reply?

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    Quote Originally Posted by samit View Post
    Which is best ADSL1 or ADSL2+..and on which technology the BSNL BB works
    ADSL2+ is best and BSNL also uses same but it is good for you only if you are near to exchange otherwise select G.Dmt in your modem

    Quote Originally Posted by Toxicated Shehzada Namit View Post
    well i just complained about it when will they reply?
    It can take upto a week depending on your location

  46. #166
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    thank you for helping can u tell me what dns ur using?

  47. #167
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    google dns 8.8.8.8 , 8.8.4.4

  48. #168
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    but 218.248.255.193 and 194 also better? and when i just click on advanced below alternative DNS then DNS tab its possible to add as many DNS as possible so is it nice to add many DNS that are too fast?

    Thanks!

  49. #169
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    You can add only two DNS entries - primary and secondary.
    *** Never argue with an idiot. ***

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    Quote Originally Posted by just4kix View Post
    You can add only two DNS entries - primary and secondary.
    Let me show u.. prntscr.co m/7faxv

  51. #171
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    Default Hi

    Thanks alot for the very informative thread..

    after 3years i have again taken a connection from bsnl broadband, now in 900 uld plan(4mbps till 8gb-512kbps unlimited)..here im posting my snr values..

    SNR Margin(dB): 33.1(dn)-28.5(up)
    Attenuation(dB): 31.5(dn)-15.7(up)
    Output Power(dBm): 12.3(dn)-13.7(up)
    Rate (Kbps): 1996(dn)-493(up)

    my problem is im getting only 215KB download speed and internet led on modem(ulstarcom ut300r2u) stops blinking every 5-10 min..and again starts with in 30-60sec..i dont know why this frequent disconnections happening..

    can some one help me with this..?

    thanks

  52. #172
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    Your line attenuation is too high and it looks like your connection is capped at 2mbps. You have to ask SDE to raise the cap at 4mbps

  53. #173
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    Quote Originally Posted by maxsteel View Post
    Your line attenuation is too high and it looks like your connection is capped at 2mbps. You have to ask SDE to raise the cap at 4mbps
    thanks alot max, line rate got changed to 3998... now getting 400-430KB download speed....but disconnection problem still persists..now it happens with lower frequency(every 20min to 40min..).. what should i be doing to bring down the attenuation rate? every thing looks ok on wiring part..wire connects directly from pole to splitter, no breakage in between...and exchange is located around 1.5km.. could that be an issue?

  54. #174
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    Status SHOWTIME
    Mode ADSL2+
    Type

    Downstream Upstream
    Rate (Kbps) 2045 508
    SNR Margin (dB) 4.6 10.5
    Attenuation (dB) 57.0 36.2
    Attainable Rate (Kbps): 2632 596
    Output Power (dBm) 12.9 0.0
    Super Frames 6536 6177
    Super Frame Errors 107 0


    this is my readout for bsnl bbnd plan 900 unlimited-how does this fare- i have frequent disconnections-what can i do
    Last edited by anirudhpanwar; 11th May 2014 at 08:27 AM.

  55. #175
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    Default frequent net disconnection

    Hello

    I am broadband user for past 2 years. Now few months am sufferring frequent link failures. I complained in BSNL exchange and requested for changing of dropwire. But the problem still persists.
    After logging in , I found the SNR Values is below 10 . Even this I brought to BSNL officials but they are saying this doesnot have anything to do.


    I have uploaded the screenshot . Kindly look and suggest me what to do.
    Attached Images Attached Images

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