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Thread: Understanding SNR and Attenuation Rates

  1. #226

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    Quote Originally Posted by sand_man View Post
    Hey Pada

    Telkom Adsl call centre telling me the highest available option on this line is 6mb. It's possible the exchange has imposed a restriction. This exchange was heavily congested in the past.
    The issue here is your exchange and not your line.Once the capacity constraints have been addressed you should be able to bump it up to 10Mb

  2. #227

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    Happy

    Hey i was looking through my billion 711ce configuration and found the snr:

    ADSL STATUS

    ADSL Line State: SHOWTIME
    ADSL Modulation: G.dmt
    ADSL Annex Mode: ANNEX_A
    ADSL Startup Attempts: 1
    Elaspsed Time: 0 days 0 hours 19 minutes 42 seconds

    Downstream Upstream
    SNR Margin 17.9 12.0 dB
    Line Attenuation 24.9 16.0 dB
    Errored Seconds 1 3
    Loss of Signal 0 0
    Loss of Frame 0 0
    CRC Errors 1 3
    Data Rate 8128 896 kbps
    Latency INTERLEAVED INTERLEAVED

    Are these reasonable number? I am quite happy with my data rate, but not sure about the snr and line attenuation, what are good numbers?

    Thanks

  3. #228
    Super Grandmaster Tinuva's Avatar
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    Quote Originally Posted by libanez-paul View Post
    Happy

    Hey i was looking through my billion 711ce configuration and found the snr:

    ADSL STATUS

    ADSL Line State: SHOWTIME
    ADSL Modulation: G.dmt
    ADSL Annex Mode: ANNEX_A
    ADSL Startup Attempts: 1
    Elaspsed Time: 0 days 0 hours 19 minutes 42 seconds

    Downstream Upstream
    SNR Margin 17.9 12.0 dB
    Line Attenuation 24.9 16.0 dB
    Errored Seconds 1 3
    Loss of Signal 0 0
    Loss of Frame 0 0
    CRC Errors 1 3
    Data Rate 8128 896 kbps
    Latency INTERLEAVED INTERLEAVED

    Are these reasonable number? I am quite happy with my data rate, but not sure about the snr and line attenuation, what are good numbers?

    Thanks
    For a 8mbit line those stats are perfect.

    SNR of 17 for downstream is well above the required 10 for a stable line, same goes for the 12 SNR on upstream. You should have a perfect line, as long as your exchange is not congested, most ISPs should give you a very very nice experience, especially on the capped accounts which is not limited to a specific account speed.
    Few people can see the genius in someone who has offended them.
    - Robertson Davies

  4. #229

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    Happy

    SNR ratio is your line strength. The more the better. Too many joints, old telephone wire and noisy neighborhoods can bring down your SNR rates.
    0-10 - very bad
    10-20 - little bad
    20-30 - good
    30-40 - excellent
    40-50 - congratulations, you live right next to the exchange

    Attenuation is the distance from your home to the exchange. The lower the better and it means your closer to your exchange.

    Different plans show different SNR rates. So if your getting 30db on 256kbps-2048kbps connection, You may get 40db on a 256kbps unlimited connection. So be sure to mention your plan.

    Here's mine:
    Plan : 256kbps / 2048kbps
    SNR Margin (dB): 34.4 down / 18.3 up
    Attenuation (dB): 24.5 down / 11.5 up

  5. #230

  6. #231

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    Can I get 4Mbps?: here's my stats, Telkom says I can only Get 1 Mbps according to their system.
    Operational Mode G.Dmt.BisPlus
    Annex Type AnnexA
    Upstream 127500
    Downstream 383800
    SNR Margin(Upstream) 49.5 dB
    SNR Margin(Downstream) 43.15 dB
    Line Attenuation(Upstream) 1.5 dB
    Line Attenuation(Downstream) 9.5 dB
    CRC Errors(Upstream) 0
    CRC Errors(Downstream) 0
    Latency(Upstream) Fast
    Latency(Downstream) Fast

  7. #232
    Super Grandmaster sand_man's Avatar
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    Gees, those are some of the best snr margins I've ever seen!!! Fibre Optic unless you live across the road from the exchange..
    Every minute I stay in this room, I get weaker, and every minute Charlie squats in the bush, he gets stronger

  8. #233
    Super Grandmaster Tinuva's Avatar
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    I think the DSLAM is other side of his wall or something.
    Few people can see the genius in someone who has offended them.
    - Robertson Davies

  9. #234

    Cool

    Gees, those are some of the best snr margins I've ever seen!!! Fibre Optic unless you live across the road from the exchange..
    I think the DSLAM is other side of his wall or something.
    I live 350m from the DSLAM.

  10. #235

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    I have a similar reading :

    Channel: FAST, Upstream rate = 512 Kbps, Downstream rate = 4096 Kbps
    Link Power State: L0
    Mode: G.DMT
    Channel: Fast
    Trellis: ON
    Line Status: No Defect
    Training Status: Showtime
    Down Up
    SNR (dB): 30.2 27.0
    Attn(dB): 10.0 6.0
    Pwr(dBm): 11.2 12.1
    Max(Kbps): 12256 1212
    Rate (Kbps): 4096 512

    But when I ask telkom for a 10mbps line they say the exchange only supports 4mpbs.

  11. #236
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    Quote Originally Posted by mono2 View Post
    I have a similar reading :

    Channel: FAST, Upstream rate = 512 Kbps, Downstream rate = 4096 Kbps
    Link Power State: L0
    Mode: G.DMT
    Channel: Fast
    Trellis: ON
    Line Status: No Defect
    Training Status: Showtime
    Down Up
    SNR (dB): 30.2 27.0
    Attn(dB): 10.0 6.0
    Pwr(dBm): 11.2 12.1
    Max(Kbps): 12256 1212
    Rate (Kbps): 4096 512

    But when I ask telkom for a 10mbps line they say the exchange only supports 4mpbs.
    You'll also notice that your modem is currently connecting with G.DMT modulation. Once it changes over to ADSL2+ modulation, only then you might be able to get 10Mbps.

    I'd say be glad that your exchange is still only running at 4Mbps, because I've seen too many issues in areas where Telkom is allowing people to connect at 10Mbps.

  12. #237
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    Quote Originally Posted by elriconess View Post
    Can I get 4Mbps?: here's my stats, Telkom says I can only Get 1 Mbps according to their system.
    Operational Mode G.Dmt.BisPlus
    Annex Type AnnexA
    Upstream 127500
    Downstream 383800
    SNR Margin(Upstream) 49.5 dB
    SNR Margin(Downstream) 43.15 dB
    Line Attenuation(Upstream) 1.5 dB
    Line Attenuation(Downstream) 9.5 dB
    CRC Errors(Upstream) 0
    CRC Errors(Downstream) 0
    Latency(Upstream) Fast
    Latency(Downstream) Fast
    That should be fine for 4meg connection
    “We know too well that our freedom is incomplete without the freedom of the Palestinians.”― Nelson Mandela

  13. #238

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    --- DSL Information ---
    DSL Driver Version: AnnexA version - A2pB023k.d21d
    DSL VPI/VCI: 8/35
    DSL Status: Showtime
    DSL Mode: G.DMT
    DSL Channel:
    DSL Upstream Rate: 512 Kbps
    DSL Downstream Rate: 2656 Kbps

    Down up
    DSL Noise Margin: 7.2 dB 11.0 dB
    DSL Attenuation: 60.0 dB 31.5 dB
    DSL Transmit Power: 18.0 dBm 12.2 dBm

    Please help!!! Why are the Stats so bad???

    We wer always syncing at 4mb fine but now after a fault was fixed its dropped and is not stable ?? :'( Please help

  14. #239
    Super Grandmaster ichigo's Avatar
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    Quote Originally Posted by mono2 View Post
    I have a similar reading :

    Channel: FAST, Upstream rate = 512 Kbps, Downstream rate = 4096 Kbps
    Link Power State: L0
    Mode: G.DMT
    Channel: Fast
    Trellis: ON
    Line Status: No Defect
    Training Status: Showtime
    Down Up
    SNR (dB): 30.2 27.0
    Attn(dB): 10.0 6.0
    Pwr(dBm): 11.2 12.1
    Max(Kbps): 12256 1212
    Rate (Kbps): 4096 512

    But when I ask telkom for a 10mbps line they say the exchange only supports 4mpbs.
    PM your number I can check if your exchange is 10 megs if it is its your dslam card which hasn't been upgraded like mine.

    My dslam/exchange is 10 meg after confirming tests when my card blew Thursday while testing other cards in box.

    They were on modulation ADSl 2+, but I am still using an old card so I only get 4 megs/g.dmt, cause it wasn't working on the new cards, since it gave only gave me 512 kbps and 10 db for downstream or I would have used new card.

    So be happy you using old cards since they work better atm till they can get one which is compatible with your old card.

    SNR Margin (0.1 dB): 296 270
    Attenuation (0.1 dB): 80 35
    Output Power (0.1 dBm): 72 121
    Attainable Rate (Kbps): 12160 1216
    Rate (Kbps): 4096 512

    Pretty similar to my stats
    Last edited by ichigo; 01-04-2012 at 01:40 PM.

  15. #240
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    Can someone workout if my line would support 10MB

    Operational Mode G.Dmt
    Annex Type AnnexA
    Upstream 512000
    Downstream 4096000
    Elapsed Time 0 day 3 hr 7 min 0 sec
    SNR Margin(Upstream) 12 dB
    SNR Margin(Downstream) 19.5 dB
    Line Attenuation(Upstream) 17.5 dB
    Line Attenuation(Downstream) 32.5 dB
    CRC Errors(Upstream) 8
    CRC Errors(Downstream) 0
    Latency(Upstream) Fast
    Latency(Downstream) Fast
    https://www.showtimefinance.co.za Blacklisted clients Welcome to Apply for PayDay loans,Personal Loans.We also offer TopUp cellphone and tablet deals.

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