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    Noise Margin plummets in the evening

    This is a discussion on Noise Margin plummets in the evening within the Sky Broadband help forums, part of the Sky Broadband help and support category; Oh my word, dose anyone remember in the good old days? well about 8 years ago when we were all ...

    1. #11
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      Re: Noise Margin plummets in the evening

      Oh my word, dose anyone remember in the good old days? well about 8 years ago when we were all so impressed that we could suddenly talk to the outside world via a 54kb dial up? It's like kids with toys the more they have the more they want! but hey I'm that old I was impressed by Space Invaders!

      Oh and I remember paying 15 a month for 54kb dial up at one time as well!
      Last edited by Koala5; 14-04-07 at 02:57 AM.


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    3. #12
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      Re: Noise Margin plummets in the evening

      I'm ancient enough to remember those days too -and before.

      I started off with Compuserve when they launched pretty much the first commercial internet service in the UK. Blistering speeds on my "cutting edge" 28.8kb modem. Sometimes I hit the giddy heights of nearly 20k if things were going really well and felt very superior to a couple of colleagues who only had 14.4kb modems. Not that there was too much to do with it then as the www hadn't got going. When 56kb came I bought a new modem and could get nearly 45kb downloads!

      Much later my exchange was one of the first to go BB and I remember being knocked out by 512k for only 30 a month.

      Yes I think BT should spend billions upgrading several hundred thousand miles of cable right now. I'm so fed up that I have to run my 10 a month unlimited 13.5meg connection at 11.5 meg to keep a healthy noise margin.

    4. #13
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      Re: Noise Margin plummets in the evening

      One option for sky is to place everyone on their LLU equipment to ADSL2+, which would enable the SRA to kick in. I have exactly the same problem and keep rebooting the router manually.

      I have been put on adsl although my exchange is Sky llu enabled. With a downstream attenuation of 52 I will not gain any speed by moving over to adsl2+, but with SRA enabled it will help greatly with reliability.

      Any way to get sky to move me over to ADSL2+ with a 52DB down attenuation.

    5. #14
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      Re: Noise Margin plummets in the evening

      Whilst ADSL2+ has SRA capability, in common with many other ISPs around the world, Sky haven't implemented it (yet) presumably 'cause it doesn't work very well.

      As it stands it's an inconvenience in that you have to manually fix an adequate NM if your line is long and/or noisy. However you only need to do this once then leave your router powered up.

      You would not benefit by moving to ADSL2+ with a 52db attenuation.
      Last edited by Saturday; 14-04-07 at 09:52 AM.

    6. #15
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      Re: Noise Margin plummets in the evening

      Looks like no dice. The noise margin stay relatively high but around 20:00 crc errors surge

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: FAST, Upstream rate = 764 Kbps, Downstream rate = 15323 Kbps
      Link Power State: L0
      Mode: ADSL2+
      Channel: Fast
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 8.3 12.5
      Attn(dB): 27.0 14.5
      Pwr(dBm): 844.8 12.4
      Max(Kbps): 16644 864
      Rate (Kbps): 15323 764
      G.dmt framing
      K: 239(0) 24
      R: 16 16
      S: 1 8
      D: 64 8
      ADSL2 framing
      MSGc: 59 68
      B: 238 23
      M: 1 8
      T: 2 1
      R: 16 16
      S: 0.4980 7.7037
      L: 4096 216
      D: 64 8
      Counters
      SF: 2151908 2151906
      SFErr: 50705 3
      RS: 279748150 18291201
      RSCorr: 594136 99
      RSUnCorr: 118152 0

      HEC: 50026 5
      OCD: 23 0
      LCD: 0 0
      Total Cells: 1258619371 62716990
      Data Cells: 22711636 20539875
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 1185 2
      SES: 866 0
      UAS: 14 396
      Total time = 9 hours 40 min 51 sec
      SF = 2151908
      CRC = 50705
      LOS = 0
      LOF = 0
      ES = 1185
      Latest 1 day time = 9 hours 40 min 51 sec
      SF = 2151908
      CRC = 50705
      LOS = 0
      LOF = 0
      ES = 1185
      Latest 15 minutes time = 10 min 51 sec
      SF = 40272
      CRC = 16658
      LOS = 0
      LOF = 0
      ES = 398
      Previous 15 minutes time = 15 min 0 sec
      SF = 55590
      CRC = 27105
      LOS = 0
      LOF = 0
      ES = 576
      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 = 55591
      CRC = 6855
      LOS = 0
      LOF = 0
      ES = 163
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 55652
      CRC = 43
      LOS = 0
      LOF = 0
      ES = 22
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 55591
      CRC = 1
      LOS = 0
      LOF = 0
      ES = 1

    7. #16
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      Re: Noise Margin plummets in the evening

      Quote Originally Posted by dq1 View Post
      Looks like no dice. The noise margin stay relatively high but around 20:00 crc errors surge
      You need to look for something electrical in or around your house that's coming on at that time e.g.
      • Putting the lights on - dimmer switches can pump out a lot of rf noise, fluorescent tubes too
      • Thermostat on CH or immersion - thermostats can cause big noise spikes

      If it's outside then there's not too much you can do e.g. street lighting coming on.

    8. #17
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      Re: Noise Margin plummets in the evening

      Heard on the news this morning that Ofcom were warning British Broadband companies to get into line with Europe on speeds, apparently were laggin behind. Its about time, US&A surf at a minimum of 25Mb Dl. As always just another example of BB companies milkin it for what they can get.

      Good old watchdog !!

    9. #18
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      Re: Noise Margin plummets in the evening

      Quote Originally Posted by Saturday View Post
      You need to look for something electrical in or around your house that's coming on at that time e.g.
      • Putting the lights on - dimmer switches can pump out a lot of rf noise, fluorescent tubes too
      • Thermostat on CH or immersion - thermostats can cause big noise spikes

      If it's outside then there's not too much you can do e.g. street lighting coming on.
      Thanks. I'll bare this in mind. There are numerous devices we have to could potentially produce interference (thermostats, house alarm linked to control centre etc.) but none I can think of that only operate during those periods.

      Last night the street lamps came on after 20:00 but the error spike were no where near as strong. (had about 900 in one 15 min period then it was fine). So whatever is causing the strong spikes, for now I'll assume its outside and beyond my control.

    10. #19
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      Re: Noise Margin plummets in the evening

      Quote Originally Posted by Saturday View Post
      I'm so fed up that I have to run my 10 a month unlimited 13.5meg connection at 11.5 meg to keep a healthy noise margin.
      What settings do I need to fiddle with/reduce to get a healthy noise margin ?

      Will less noise reduce CRC errors ?

    11. #20
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      Re: Noise Margin plummets in the evening

      I think I've suggested at least three times now that the answers to the questions you keep asking (in other threads) are available in the forum stickies.

      If you don't understand the information then please ask for an explanation and I'll do my best to help you. However, if you just can't be bothered to read them then you'll understand if I can't be bothered to keep replying to you

     

     
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