Noise Margin expectations?
Hi
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
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
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with an atten off 43db. if you had a stable 6db noise margin you could squeeze out around 6304kbps sync rate.
info taken from here http://www.kitz.co.uk/adsl/max_speed_calc.php
thats some serious noise you have there
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
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
