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    Is my Downstream Capped?

    This is a discussion on Is my Downstream Capped? within the Sky Broadband help forums, part of the Sky Broadband help and support category; Hi, I've been spending a couple of hours sorting out my connection today and have replaced the BT master socket ...

    1. #1
      razorhazor's Avatar
      razorhazor is offline Sky User Member
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      Is my Downstream Capped?

      Hi,

      I've been spending a couple of hours sorting out my connection today and have replaced the BT master socket with a new ADSLNation filtered faceplate and have replaced the phone jack with a nice beefy high quality one and have noticed my attenuation drop a little and my line speed rise considerably.

      I now have line speed of 12286 on an attenuation of 35.5. My detailed router stats however ellude to a higher maximum obtainable rate, so I tried lowering the SNR. However this doesnt have any affect at all, noise margin remains the same on the router and line speed remains exactly the same.

      Is this normal? am I tweaking too far? in the past I've tried this (Bulldog ADSL2) and have manage to squeeze a bit more out of the line.

      Detailed stats are:
      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: FAST, Upstream rate = 734 Kbps, Downstream rate = 12286 Kbps
      Link Power State: L0
      Mode: ADSL2+
      Channel: Fast
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 8.3 13.5
      Attn(dB): 35.5 22.8
      Pwr(dBm): 1.2 12.4
      Max(Kbps): 15308 848
      Rate (Kbps): 12286 734
      G.dmt framing
      K: 239(0) 14
      R: 16 16
      S: 1 16
      D: 64 4
      ADSL2 framing
      MSGc: 98 120
      B: 238 13
      M: 1 16
      T: 1 1
      R: 16 16
      S: 0.6198 9.0566
      L: 3291 212
      D: 64 4
      Counters
      SF: 1736 1734
      SFErr: 0 1
      RS: 180580 7369
      RSCorr: 78 0
      RSUnCorr: 0 0

      HEC: 0 0
      OCD: 0 0
      LCD: 0 0
      Total Cells: 813081 48501
      Data Cells: 0 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 0 1
      SES: 0 0
      UAS: 82 15
      Total time = 10 min 11 sec
      SF = 30701
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Latest 1 day time = 10 min 11 sec
      SF = 30701
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Latest 15 minutes time = 10 min 11 sec
      SF = 30701
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 15 minutes time = 0 sec
      SF = 0
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0
      Previous 1 day time = 0 sec
      SF = 0
      CRC = 0
      LOS = 0
      LOF = 0
      ES = 0

      Many Thanks
      Matt
      Last edited by razorhazor; 04-12-07 at 02:09 PM.


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    3. #2
      Saturday's Avatar
      Saturday is offline Sky User Super Mod
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      Re: Is my Downstream Capped?

      Quote Originally Posted by razorhazor View Post
      Is my Downstream Capped?
      It looks that way but it's hard to say for sure. There are certainly signs such as the big gap between your router reported max rate and your actual, plus you say the router always syncs at the same speed. However your noise margin is only 1.4db above the router default.

      Whilst an uncapped line will normally have a small gap between max and actual and a capped line have a large(er) gap, that's not a hard and fast rule. A large gap can sometimes indicate that the router is having to deal with specific noise issues and is blocking out specific frequencies to deal with this. In that instance you'd expect to see the noise margin close to default, as yours is.

      If you are capped then that's probably a good thing as were you to sync higher your noise margin would probably drop too low during the evening (at least it would with the current firmware).
      Last edited by Saturday; 04-12-07 at 02:33 PM.

     

     

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