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    What speed should I expect?

    This is a discussion on What speed should I expect? within the Sky Broadband help forums, part of the Sky Broadband help and support category; Hi My latest figures show - download: Attenuation: 56db Noise margin: 23db (up from my previous 6.4db) I am getting ...

    1. #1
      nickbiker's Avatar
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      What speed should I expect?

      Hi

      My latest figures show - download:

      Attenuation: 56db
      Noise margin: 23db (up from my previous 6.4db)

      I am getting a speed of 896k (up from 800k)

      Given the improvement in the noise margin, how come the speed has not changed. Is there a "maximum" in the router that is somehow set?

      Looking at my file from the router, you can see:

      Max(Kbps): 896 1024
      Rate (Kbps): 800 416

      What does the "max" relate to and who sets this?

      Thanks for any help - I am trying to get to the bottom of why IK am not getting closer to the 3Mb I should get at this attenuation.


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    3. #2
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      Re: What speed should I expect?

      the 'max' figure is the maximum the line will take, the rate is what ur getting....no one controls the max figure, this is what the line (in its current state) will give at a maximum

      something like that anyway

    4. #3
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      Re: What speed should I expect?

      If you reboot the router and you still have a noise margin somewhere around 23db then you're probably capped. Please post your full stats.

    5. #4
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      Re: What speed should I expect?

      Quote Originally Posted by Saturday View Post
      If you reboot the router and you still have a noise margin somewhere around 23db then you're probably capped. Please post your full stats.
      Hi

      Do Sky do this capping without telling you? How can I get it reset?

      Here are the stats:

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: INTR, Upstream rate = 416 Kbps, Downstream rate = 896 Kbps
      Link Power State: L0
      Mode: G.DMT
      Channel: Interleave
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 23.4 14.0
      Attn(dB): 56.0 31.5
      Pwr(dBm): 14.4 3.7
      Max(Kbps): 3968 992
      Rate (Kbps): 896 416
      G.dmt framing
      K: 29(0) 14
      R: 16 16
      S: 4 16
      D: 32 8
      ADSL2 framing
      MSGc: 1 1
      B: 29 14
      M: 4 16
      T: 1 1
      R: 16 16
      S: 4.5333 17.0666
      L: 240 120
      D: 32 8
      Counters
      SF: 3074962 3074960
      SFErr: 5 0
      RS: 52274358 13068580
      RSCorr: 4704 574
      RSUnCorr: 44 0

      HEC: 4 0
      OCD: 0 0
      LCD: 0 0
      Total Cells: 110466498 0
      Data Cells: 299452 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 120 0
      SES: 118 0
      UAS: 21 0
      Total time = 14 hours 31 min 42 sec
      SF = 3074962
      CRC = 5
      LOS = 131
      LOF = 0
      ES = 120
      Latest 1 day time = 14 hours 31 min 42 sec
      SF = 3074962
      CRC = 5
      LOS = 131
      LOF = 0
      ES = 120
      Latest 15 minutes time = 1 min 42 sec
      SF = 5999
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 15 minutes time = 15 min 0 sec
      SF = 52989
      CRC = 0
      LOS = 1
      LOF = 0
      ES = 1
      Previous 1 day time = 0 sec
      SF = 0
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
      SF = 52931
      CRC = 0
      LOS = 4
      LOF = 0
      ES = 3
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 52930
      CRC = 0
      LOS = 1
      LOF = 0
      ES = 1
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 52931
      CRC = 0
      LOS = 1
      LOF = 0
      ES = 1

      Thanks.

      Sky make this such an effort!!

    6. #5
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      Re: What speed should I expect?

      yes, Sky cap when they find that problems on a line are preventing a stable connection. Usually this is in a response to a customer technical support call but sometimes they are proactive.

      Your stats certainly indicate that there is a strong likelihood that you've been capped. This would appear to have succeeded in controlling your errors to a reasonable level though your loss of signal figure is still a little high.

      There is no point in asking Sky to uncap you until you have sorted out the cause of these line errors. In 90% of cases it is down to internal phone wiring - especially the use of extensions. This is your problem to sort. Sometimes it is down to the BT line between you and the exchange. This is BT's problem to sort but only if it is impacting voice calls.

      Please see the cabling and faceplate help forum for advice on diagnosing and fixing line problems.

      PS. If you get this sorted and get uncapped then you can expect a new connection speed of ~4000kbps which is 5x faster than your current.

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      Re: What speed should I expect?

      Hi

      Thansk for that. BT are coming to update my Master Socket to a new style and to check the wiring up to the socket which looks old. There are no internal extensions atall, I have checked the wiring. The only possibility is the bell-wire still being connected to the old socket (but as there are no extensions, it is unlikley to make much difference?).

      Once BT engineer has done his stuff, I will check the stats again!

      What sort of noise margin should I be expecting - at the moment it is 24.1db.

    8. #7
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      Re: What speed should I expect?

      Actually the bell wire is often a problem. It acts as a great long aerial and picks up all sorts of rf interference.

      The Sky router will always (on an uncapped line) sync at the highest rate it can for a minimum noise margin of 6.9db. So for your line with an attenuation of 32db, if you can clear all noise, uncapped you should get ~16000kbps at a noise margin of ~7db. A lower attenuation would have a higher noise margin on syncing.

      Currently your line is capped so the speed will stay about the same and the noise margin will move - more noise and it will go down, less noise and it will go up. Therefore, the more it goes up the more noise the BT engineer will have removed. If you want to keep the bell wire connected then I'd advise fitting a replacement fitered faceplate (ask the engineer nicely and you might get one free) otherwise you can disconnect it. Modern phones will still ring, old phones will need to be plugged into a microfilter.
      Last edited by Saturday; 07-06-07 at 07:05 PM.

    9. #8
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      Smile Re: What speed should I expect?

      Hi again nick, I missed your other post in the other thread so i'll post here just to say,

      Saturday is correct in all he says

      It looks like you have sorted out the BAD line noise you had and because of that noise sky did cap you at the 800k mark, but now the noise is better you could get a 4mbs sync speed which is quite good for a 56db attenuation, i am not sure if the errors you had yesterday are still showing for todays stats as if you do not reset the router ( with the little black reset button ) those stats will stay logged on the router untill you do reset it.

      Be patient and wait for the bt guy to do his stuff but you may find he doesn't improve it that much.

      I would get onto sky and just be honest and state that you had a bad noise on the line and because of this you were capped by sky to 800k, but now you have sorted out your line noise and you should now get alot higher speeds ( thats basically what i told them as i had a dodgy telephone extension ) and they fixed it about 3 days later. In the meantime the bt engineer will change your socket and your good to go.

      Good luck!
      Bt phone socket and wiring help > http://www.skyuser.co.uk/forum/cabling-faceplate-help/

      Router stats and help on understanding them > http://www.skyuser.co.uk/forum/router-stats/

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      Re: What speed should I expect?

      u want a noise margin between 7 and 15 ideally. Again this is a tier 3 speed and config problem, plug to test socket re-run test, change filter re-run test. If it's the same u can quickly go through tier 1 to get to tier 3 for further tests
      It doesn't get better than this band lol

     

     

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