Noise Margin expectations?
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Noise Margin expectations?
10-05-2009 4:56 PM
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I have followed a number of threads with interest and now started experimenting with trying to improve my line speed.
I have a Netgear DG834 which at the moment, is plugged into the BT master socket via a filter into which there is also plugged one hardwired phone on a short cable. This is for testing purposes only and normally there is a filtered NT5 faceplate with some extensions attached as well.
I have routerstats running and would like some help in interpreting the results. The main puzzle is the noise margin which is jumping around like mad. A few days ago it was bouncing around between 3db and 1db (occasionally 0db). Then mysteriously, it improved to bouncing around between 9 or 10db and 5 or 6db. Since then, I changed the wiring to as I describe above. I now have noise margin readings that go 9,8,9,8,5,9,5,3,8 in successive readings. So the change to the master socket has made no difference. Upstream Noise margin is a steady 19db. Receive Synch speed is currently 3712kbps but it will not stay there - this morning it was 2900kbps for instance.
Looking at the bits/tone graph, there are what I think are a lot of bit swops registered on some tones. On successive readings, there have been 10 to 20 bit swaps over the last few minutes.
OK, I am happy with 3712, I do live some way from the exchange, but I would like it to stay there. I think that means getting the noise margin to be stable, at 9 say, (then let it reduce as the speed increases even further )
Should the noise margin leap around like mine is?
If not, what does anyone suggest I do to get it improved - (careful reading of the above will suggest that my internal wiring makes no difference - so its BT who might do something)
Any comments or suggests gratefully received
Jim
Re: Noise Margin expectations?
10-05-2009 5:17 PM
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Can you post a picture of the noise margin fluctuation from Routerstats (select additional options under the post to add a picture) and also the full stats from the router - select telnet router in routerstats and then Summary - you can either copy and paste or ad the information as a picture
Re: Noise Margin expectations?
10-05-2009 5:31 PM
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Re: Noise Margin expectations?
10-05-2009 5:35 PM
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Re: Noise Margin expectations?
10-05-2009 5:37 PM
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Connection Rate: 3712 Kbps
Line Attenuation: 43 dB
Noise Margin: 4 dB
Interleave CRC: 179
Interleave FEC: 4273
Interleave HEC: 0
Fast path CRC: 0
Fast path FEC: 0
Fast path HEC: 0
Now Tx
Connection Rate: 448 Kbps
Line Attenuation: 28 dB
Noise Margin: 19 dB
Interleave CRC: 8
Interleave FEC: 0
Interleave HEC: 476
Fast path CRC: 0
Fast path FEC: 0
Fast path HEC: 0
Upstream (Tx):
Good Cells: 57075
Idle Cells: 4985686
Downstream (Rx):
Good Cells: 426366
Idle Cells: 41354091
Bad HEC Cells: 2156
Overflow Dropped: 0
Bytes Transferred (ppp0):
Tx: 2081618 (1.9 Mb)
Rx: 19825001 (18.9 Mb)
Remember it has only been on again for about 40 minutes
Reference the quiet phone test, No I have not - I will do so shortly and report back.
Thanks
Jim
Jim
Re: Noise Margin expectations?
10-05-2009 5:41 PM
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Note similar speeds but much higher attenuation - you have a major noise problem
Quote Noise Margin: 8.6 dB
Connection Rate: 3776 Kbps
Line Attenuation: 52.0 dB
Power: 19.3 dBm
SF: 122833987
SF Errors: 4001
Reed Solomon: 4176355570
RS Corrected: 556546
RS Un-Corrected: 39206
HEC: 3752
Errored Seconds: 1508
Severe ES: 29
Interleave Depth: 16
Re: Noise Margin expectations?
10-05-2009 5:56 PM
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info taken from here http://www.kitz.co.uk/adsl/max_speed_calc.php
thats some serious noise you have there
Quote That is absolutely awful - have you tried the quiet line test - dial 17070 option 2
i would give that ago
post back with what you hear or dont hear and the guys will tell you how to log this with your line rental provider if you need to.
the main thing if you do have noise on your phone service is dont say anything about broadband
@oldjim
Connection Rate: 4544 Kbps
Line Attenuation: 50.5 dB
Re: Noise Margin expectations?
10-05-2009 5:57 PM
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I guess thats the wrong answer!!
Jim
Re: Noise Margin expectations?
10-05-2009 5:59 PM
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Re: Noise Margin expectations?
10-05-2009 6:00 PM
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Jim
Re: Noise Margin expectations?
10-05-2009 6:05 PM
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Re: Noise Margin expectations?
10-05-2009 6:07 PM
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Re: Noise Margin expectations?
10-05-2009 6:32 PM
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Error: get not enough data/ too many errors : Connection was disconnected
I selected Annex A at the start (POTS - not ISDN). I wonder if it can cope with my modem - it is one of the original version 1 ones - so is there any special settings I need?
Jim
Re: Noise Margin expectations?
10-05-2009 6:35 PM
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Jim
Re: Noise Margin expectations?
10-05-2009 6:37 PM
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