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j-whitney
Aspiring Expert
1,951 Views
Message 1 of 14

Noise margin?

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Hello I was wondering is my noise margin high? I heard its ment to be about 6? I have tried my home hub plugged into the test socket and it stays the same?

Connection Information
Line stateConnected
Connection time5 days, 03:06:02
Downstream8,128 Kbps
Upstream448 Kbps
 
ADSL Settings
VPI/VCI0/38
TypePPPoA
ModulationG.992.1 Annex A
Latency typeFast
Noise margin (Down/Up)13.8 dB / 24.0 dB
Line attenuation (Down/Up)6.5 dB / 2.5 dB
Output power (Down/Up)12.4 dBm / 1.6 dBm
Loss of Framing (Local/Remote)0 / 0
Loss of Signal (Local/Remote)0 / 0
Loss of Power (Local/Remote)0 / 0
FEC Errors (Down/Up)0 / 54
CRC Errors (Down/Up)5827 / 141
HEC Errors (Down/Up)5394 / 14
Error Seconds (Local/Remote)5672 / 177
 
Thanks
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13 REPLIES 13
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Message 2 of 14

Re: Noise margin?

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That is  high.

 

Pick the phone up and dial one number... Is there crackling on the line ?

An MSCE in computing is like having a McDonalds Certification in World Cuisine, pointless.
j-whitney
Aspiring Expert
1,933 Views
Message 3 of 14

Re: Noise margin?

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I just rang 17070 and did the quiet line test and it sounds fine to me 😕

Thanks
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Geoff93
Recognised Expert
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Message 4 of 14

Re: Noise margin?

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Given how near to the exchange you are it should make no difference to the speed you are getting. You are synced at the highest rate.
G3NDI
Aspiring Expert
1,924 Views
Message 5 of 14

Re: Noise margin?

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System Win XP Pro SP2 and BT HH ver 2.0 type B

 

Your Up Noise Margin is certainly higher than mine!   My line length is some 950m to the exchange using

http://www.kitz.co.uk/adsl/adslchecker.php

Some figures for the last few days are

Feb 14 17:40
Connection time    0 days, 02:42:16
Downstream    9,728 Kbps
Upstream    1,078 Kbps

 

Noise margin (Down/Up)    12.6 dB / 6.7 dB
Line attenuation (Down/Up)    27.0 dB / 11.9 dB
Output power (Down/Up)    22.8 dBm / 2.0 dBm

Feb 13 at 22:48
Connection time    0 days, 00:56:49
Downstream    9,728 Kbps
Upstream    1,090 Kbps

Noise margin (Down/Up)    11.7 dB / 7.3 dB
Line attenuation (Down/Up)    26.9 dB / 12.0 dB
Output power (Down/Up)    22.7 dBm / 2.0 dBm

Feb 13, 2011
Downstream    9,728 Kbps
Upstream    1,078 Kbps
 
Noise margin (Down/Up)    12.8 dB / 7.1 dB
Line attenuation (Down/Up)    26.9 dB / 12.0 dB
Output power (Down/Up)    22.9 dBm / 2.0 dBm

For Feb 11, 2011
Connection time    0 days, 00:10:37
Downstream    9,728 Kbps
Upstream    1,078 Kbps
 
Noise margin (Down/Up)    11.1 dB / 6.9 dB
Line attenuation (Down/Up)    27.1 dB / 12.0 dB
Output power (Down/Up)    22.5 dBm / 1.9 dBm

 

The connection times are because I am sufferring from random disconnects.   The Down Noise margin has been around 15 dB but has dropped slightly a few days ago.

 

Rodney Fry

j-whitney
Aspiring Expert
1,914 Views
Message 6 of 14

Re: Noise margin?

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ok, well the main reason I asked was because  when its reaches 15db it lowers the sync rate. and it was on 14db yesterday. it use to be about 12db all the time. but i'm quite sure the noise is not coming from my side of the master socket.

Thanks
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Geoff93
Recognised Expert
1,895 Views
Message 7 of 14

Re: Noise margin?

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If you are in the test socket then it cannot be on your side as using that disables everything in your house - providing it is installed correctly. If you are just in the master socket then everything in the house is still connected.
Does it rise to 15 in the test socket or just in the master one?
hamish72
Recognised Expert
1,886 Views
Message 8 of 14

Re: Noise margin?

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As you are synced at the max do a bt speed test

 

Go to http://speedtester.bt.com/
and post results

 

to show your profile and actual through put

 

 

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Just cause Im paranoid dont mean they are not out to get me





gouledw
Recognised Expert
1,881 Views
Message 9 of 14

Re: Noise margin?

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The reason your SNR is quite high is that because your quite close to the exchange and on G992.1 the exchange rises your SNR to stop the speed from trying to go high, as it is already synced at the fastest possible rate for that technology.

j-whitney
Aspiring Expert
1,871 Views
Message 10 of 14

Re: Noise margin?

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It only goes up to 15db some times when it resyncs.

Thanks
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