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    Frequent drop in effective speed, sync speed stays the same

    This is a discussion on Frequent drop in effective speed, sync speed stays the same within the Sky Router forums, part of the Sky Broadband help category; Hi all, been having a bit of a problem recently. Occasionally, (about once a day), I have to reboot the ...

    1. #1
      mvchad's Avatar
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      Frequent drop in effective speed, sync speed stays the same

      Hi all,

      been having a bit of a problem recently. Occasionally, (about once a day), I have to reboot the router, since effective download speeds crawl to about 300K/s, maybe a little bit more, but certainly after a reboot, it's back to 13M+ (tested using Namesco BroadbandMax ADSL Broadband Bandwidth speedtest | Test your ADSL Broadband connection speed. The interesting thing is that the sync speed remains constant (approx 15M), with maybe a 1db drop in noise margin at about the same time from ~7 to just over 6 (but not always), and the upload speed stays the same as it always is (approx 600K).

      It's currently happening now (showing about 600 K d/s), a reboot would go back to 15M+ for a while. These are the current stats. Anyone any ideas what the problem might be, and anyone any information about what these stats actually mean?

      Thanks in advance

      Code:
      /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):	7.2		12.5
      Attn(dB):	25.5		14.5
      Pwr(dBm):	1.3		12.4
      Max(Kbps):	15496		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:		1090562		1090560
      SFErr:		848075		1
      RS:		141773078		9269760
      RSCorr:		14175958		16
      RSUnCorr:	2764806		0
      
      HEC:		843234		0
      OCD:		102		0
      LCD:		0		0
      Total Cells:	632423740		31470542
      Data Cells:	717914		134861
      Drop Cells:	0
      Bit Errors:	0		0
      
      ES:		14011		1
      SES:		13888		0
      UAS:		14		16
      Total time = 4 hours 54 min 32 sec
      SF  = 1090562
      CRC = 848075
      LOS = 6
      LOF = 0
      ES  = 14011
      Latest 1 day time = 4 hours 54 min 32 sec
      SF  = 1090562
      CRC = 848075
      LOS = 6
      LOF = 0
      ES  = 14011
      Latest 15 minutes time = 9 min 32 sec
      SF  = 35393
      CRC = 28851
      LOS = 0
      LOF = 0
      ES  = 550
      Previous 15 minutes time = 15 min 0 sec
      SF  = 55591
      CRC = 48340
      LOS = 0
      LOF = 0
      ES  = 887
      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  = 55590
      CRC = 55382
      LOS = 0
      LOF = 0
      ES  = 900
      15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
      SF  = 55591
      CRC = 55401
      LOS = 0
      LOF = 0
      ES  = 900
      15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
      SF  = 55652
      CRC = 55410
      LOS = 1
      LOF = 0
      ES  = 885


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    3. #2
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      Re: Frequent drop in effective speed, sync speed stays the same

      YOu have massive errors on your line (almost 100%!!!).

      Have you tried connecting to the test socket beneath the master socket?

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      Re: Frequent drop in effective speed, sync speed stays the same

      Hi reddwarfcrew, thanks for the quick response.

      No, I haven't tried that yet. Can you just explain how you saw that? Also, why would rebooting the router fix it?

      Thanks in advance

    5. #4
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      Re: Frequent drop in effective speed, sync speed stays the same

      As I understand looking at these figs:

      SF = 1090562
      CRC = 848075

      the CRC should be 0 on an error free line.

      When you reboot, I guess it re-syncs at a rate that has less errors.

      If connecting to the test socket doesn't help, then use mognuts util in my sig to increase the SNR level (which will lower the sync rate) to see if that reduces the errors.

      'Saturday' is the expert on these things, so you may wish to view his profile to read some of his threads.

      A link about the master socket is in my sig too.

    6. #5
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      Re: Frequent drop in effective speed, sync speed stays the same

      Hi again, right I get the CRC entries now, thanks, however, rebooting doesn't cause any change in sync speed. I'll see if I can test using the master socket, who knows, maybe the microfilter / socket has gone haywire.

      Thanks

    7. #6
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      Re: Frequent drop in effective speed, sync speed stays the same

      remember its the test socket underneath the master socket.

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      Re: Frequent drop in effective speed, sync speed stays the same

      Hi again,

      just tried a direct connection into the extension socket, without the microfilter
      in it, and the noise margin is now roughly 8.5 instead of 7.5. Looks like the microfilter is putting quite a bit of noise onto the line, but is 1dB SNR okay for a microfilter? I wouldn't expect it to be this high?

      Thanks

    9. #8
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      Re: Frequent drop in effective speed, sync speed stays the same

      Okay. you must use the mircofilter unless you are using a filtered faceplate.

      When you say direct to the extension socket, what do you mean.

      You need to find your master BT socket, remove the faceplate to reveal a test socket. Plug a microfilter into that and then teh router and see how it is.

      If it gives improvements, thne you need to buy a new filtered faceplate from adslnation.

      The increase in SNR you have just got is probably due to the reboot of the router and nothing to do with not using the microfilter.

    10. #9
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      Re: Frequent drop in effective speed, sync speed stays the same

      As reddwaffcrew has pointed out you have a really noisy line and this is the root of your problem. When errors are being generated at that rate they overwhelm the connection after a while. Rebooting the router "wipes the slate clean" so to speak but then they start building up again and the problems reappear.

      With regard to the sync speed not changing on reboot, that's because you are already at the maximum for Sky Max (most new users are set to 15323kbps).

      You're going to have to sort your connection out if you want a stable connection. Reddwarfcrew keeps pushing you towards trying your test socket. I'm not sure you are picking up on this but the test socket is not the same as the master socket - it is hidden inside. The test socket gives you a direct connection to the wires going to the exchange and eliminates all other wiring in the house. If you try the test socket you will almost certainly see a drop in the errors - your noise margin will also be much higher than your normal connection. It is not a fix for your problem but a test to see where noise is occurring.

      Please take some time to read the cabling and faceplate help forum where you'll get info on what to do to improve your connection. The gist of it is that you must avoid using an extension to connect your router if ayt all possible. You may also benefit from fitting a replacement filtered faceplate.

    11. #10
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      Re: Frequent drop in effective speed, sync speed stays the same

      Thanks for the info, but I do know about the test socket behind the face plate of the master socket (sorry I didn't give that impression), it's just that it's difficult to move the router into that position, at the moment (but I will do soon to test it). What I wanted to know was what had changed recently, since this was a great / stable connection on an extension socket we had wired in about two years ago, as well as how to read the router stats (which once reddwarfcrew had enlightened me about the CRC entries, it became obvious).

      The situation is that I have removed the microfilter from this "extension" socket (there is no phone plugged into the master socket, so the microfilter is technically not needed, and I haven't received any calls on that line, so that won't be affecting it) and plugged the router in directly to the phone jack, the SNR jumps up about 1db. This is quite replicable, i.e. microfilter in = 6-7db, microfilter out=8db. What kind of effect on SNR does other peoples microfilters cause? Is this normal? To me, everything points to the microfilter, but I will do a comparison of the router stats later on and see if there's a big difference in errors on the line.

      Also, the connection has been active for about 4 hours now, and the connection test has shown about 12/13M pretty much constant for that time, whereas before the microfilter removal, it would have dropped down to about 300K by now.

      Thanks in advance

     

     
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