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    Attenuation - 63.5db at 2.2 km from exchange

    This is a discussion on Attenuation - 63.5db at 2.2 km from exchange within the Cabling and faceplate help forums, part of the Sky Broadband help and support category; Hmmm. Plugged into the master socket and I'm still getting this attenuation figure (its actually no different when using it ...

    1. #1
      psychocandy's Avatar
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      Attenuation - 63.5db at 2.2 km from exchange

      Hmmm. Plugged into the master socket and I'm still getting this attenuation figure (its actually no different when using it on my extension).

      Also, the most I've managed to sync at is 1800.

      Since I'm only 2.2km from the exchange, shouldn't I be getting better than this?
      Any other ideas?

      I live on new-ish estate so the phone cabling 'should' be OK (bought the house from new in 2000). Then again, you never know, do you?

      Is there anything I can do about this? Is it worth complaining to BT that my line should be better quality?


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    3. #2
      FrostFree's Avatar
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      Re: Attenuation - 63.5db at 2.2 km from exchange

      Post your full stats using this utility.

      Frostfree

    4. #3
      psychocandy's Avatar
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      Re: Attenuation - 63.5db at 2.2 km from exchange

      /usr/sbin/adslctl: ADSL driver and PHY status
      Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 1824 Kbps
      Link Power State: L0
      Mode: G.DMT
      Channel: Interleave
      Trellis: ON
      Line Status: No Defect
      Training Status: Showtime
      Down Up
      SNR (dB): 5.1 8.0
      Attn(dB): 63.5 31.5
      Pwr(dBm): 16.9 12.5
      Max(Kbps): 1984 896
      Rate (Kbps): 1824 768
      G.dmt framing
      K: 58(0) 25
      R: 16 16
      S: 4 8
      D: 32 8
      ADSL2 framing
      MSGc: 1 1
      B: 58 25
      M: 4 8
      T: 1 1
      R: 16 16
      S: 4.2711 8.6153
      L: 472 208
      D: 32 8
      Counters
      SF: 2569005 2569003
      SFErr: 1593 46
      RS: 43673104 21836525
      RSCorr: 33762208 2362
      RSUnCorr: 3120 0

      HEC: 1168 32
      OCD: 0 0
      LCD: 0 0
      Total Cells: 187874694 0
      Data Cells: 5061218 0
      Drop Cells: 0
      Bit Errors: 0 0

      ES: 1567 0
      SES: 224 0
      UAS: 28 0
      Total time = 12 hours 8 min 38 sec
      SF = 2569005
      CRC = 1593
      LOS = 442
      LOF = 0
      ES = 1567
      Latest 1 day time = 12 hours 8 min 38 sec
      SF = 2569005
      CRC = 1593
      LOS = 442
      LOF = 0
      ES = 1567
      Latest 15 minutes time = 8 min 38 sec
      SF = 30523
      CRC = 34
      LOS = 7
      LOF = 0
      ES = 36
      Previous 15 minutes time = 15 min 0 sec
      SF = 52930
      CRC = 53
      LOS = 2
      LOF = 0
      ES = 51
      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 = 44
      LOS = 6
      LOF = 0
      ES = 46
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF = 52930
      CRC = 60
      LOS = 87
      LOF = 0
      ES = 42
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF = 52931
      CRC = 26
      LOS = 3
      LOF = 0
      ES = 24

    5. #4
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      Re: Attenuation - 63.5db at 2.2 km from exchange

      The best you'll probably get with such high attenuation is in the region of 2.5 - 3MB, however you have a lot of errors and your SNR is low. Try the test from the master socket to see how much of the problem is down to your internal wiring.

      Living in a new development does not gurantee good quality telephone lines, your line probably goes through junction boxes that pre-date your property. Furthermore, your wiring to the exchange is never in a straight line, so whilst it may be just 2.2km away point-to-point, it could be using up to 4km of cabling!

      This advise is to the best of my limited knowledge, and I stand to be corrected by the real boffins.

      Frostfree
      Last edited by FrostFree; 09-05-07 at 02:27 PM.

    6. #5
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      Re: Attenuation - 63.5db at 2.2 km from exchange

      Quote Originally Posted by FrostFree View Post
      The best you'll probably get with such high attenuation is in the region of 2.5 - 3MB, however you have a lot of errors and your SNR is low. Try the test from the master socket to see how much of the problem is down to your internal wiring.

      Living in a new development does not gurantee good quality telephone lines, your line probably goes through junction boxes that pre-date your property. Furthermore, your wiring to the exchange is never in a straight line, so whilst it may be just 2.2km away point-to-point, it could be using up to 4km of cabling!

      This advise is to the best of my limited knowledge, and I stand to be corrected by the real boffins.

      Frostfree
      I would be happy with 2.5 to 3Mb !!!!

      Tried it from the master socket - same results. At least it proves my internal wiring is OK.

      So theres no way to complain to BT or anything about the attentuation on the line? Is there anything they can do? I had problems with the whole line a few months ago and they came out and fixed it. Problem was the house builders hadnt sealed in the line properly or something and something had rusted.

    7. #6
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      Re: Attenuation - 63.5db at 2.2 km from exchange

      Hi -Thought I would share my recent experience. I have the same attentuation and have been suffering from a very poor connection with frequent dropouts and poor and variable SNR (8.0db at best).
      After a number of frustrating calls to Sky I finally managed to get connected to Tier 3 support. What a great guy. He took the time to analyse my line to establish the best the it could support. Unfortunately it had to be capped to 1Mb (BT crappy wiring) but it is now rock steady with an SNR of 12.5db and a ping of 35ms (down from 150ms)

    8. #7
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      Re: Attenuation - 63.5db at 2.2 km from exchange

      Quote Originally Posted by psychocandy View Post
      Tried it from the master socket - same results. At least it proves my internal wiring is OK.
      You need to try it from the test socket. You can reveal this by unscrewing the front of your master socket and removing the bottom half.
      Only using the test socket will rule out any internal wiring issues.

    9. #8
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      Re: Attenuation - 63.5db at 2.2 km from exchange

      Quote Originally Posted by dpearce33 View Post
      Hi -Thought I would share my recent experience. I have the same attentuation and have been suffering from a very poor connection with frequent dropouts and poor and variable SNR (8.0db at best).
      After a number of frustrating calls to Sky I finally managed to get connected to Tier 3 support. What a great guy. He took the time to analyse my line to establish the best the it could support. Unfortunately it had to be capped to 1Mb (BT crappy wiring) but it is now rock steady with an SNR of 12.5db and a ping of 35ms (down from 150ms)
      I'm not getting many dropouts (I dont think) and the connection seems OK. Much better than my previous 512K with EFH Broadband anyway....

      Wheres my SNR listed? This is different to noise margin, isnt it?

    10. #9
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      Re: Attenuation - 63.5db at 2.2 km from exchange

      Quote Originally Posted by MrStabby View Post
      You need to try it from the test socket. You can reveal this by unscrewing the front of your master socket and removing the bottom half.
      Only using the test socket will rule out any internal wiring issues.
      Theres nothing else connected to the master socket, no extensions or anything.

      The only difference is that the master socket is on the front plate which plugs into the test socket on the back plate.

      Can't see how there'd be any difference?

      I agree there may be if I had extensions connected to the back of the face plate running from the master socket (but I havent).

     

     

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