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Message 1 of 3

Noise Margin Faults

How do i change the noise margin in my home hub v2. It's getting worse again it was ^.1 and running fine?


ADSL line status<script type="text/javascript">// var trClass = ["odd", "even"]; var td1 = ["w3", "Line state", "Connection time", "Downstream", "Upstream"]; var td3 = ["w3", "VPI/VCI", "Type", "Modulation", "Latency type", "Noise margin (Down/Up)", "Line attenuation (Down/Up)", "Output power (Down/Up)", "Loss of Framing (Local)", "Loss of Signal (Local)", "Loss of Power (Local)", "FEC Errors (Down/Up)", "CRC Errors (Down/Up)", "HEC Errors (Down/Up)", "Error Seconds (Local)"]; var td2 = ["", "Connected", "7 days, 7:42:58", "3,371 Kbps", "1,063 Kbps"]; var td4 = ["", "0/38", "PPPoA", "ITU-T G.992.3", "Interleaved", "16.0 dB / 6.0 dB", "45.0 dB / 23.1 dB", "0.0 dBm / 12.5 dBm", "11", "1", "0", "0 / 1", "987 / 2147480000", "nil / 1", "1213"]; // </script>

Connection information<script type="text/javascript">// createTable("normal", trClass, td1, td2); // </script>
Line stateConnected
Connection time7 days, 7:42:58
Downstream3,371 Kbps
Upstream1,063 Kbps


ADSL settings<script type="text/javascript">// createTable("normal", trClass, td3, td4); // </script>
ModulationITU-T G.992.3
Latency typeInterleaved
Noise margin (Down/Up)16.0 dB / 6.0 dB
Line attenuation (Down/Up)45.0 dB / 23.1 dB
Output power (Down/Up)0.0 dBm / 12.5 dBm
Loss of Framing (Local)11
Loss of Signal (Local)1
Loss of Power (Local)0
FEC Errors (Down/Up)0 / 1
CRC Errors (Down/Up)987 / 2147480000
HEC Errors (Down/Up)nil / 1
Error Seconds (Local)1213



Speed Test


Download speedachieved during the test was - 3352 Kbps
 For your connection, the acceptable range of speedsis 1200-4000 Kbps.
 Additional Information:
 Your DSL Connection Rate :3371 Kbps(DOWN-STREAM), 1063 Kbps(UP-STREAM)
 IP Profile for your line is - 2500 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 3.91:35.65:60.43 (SBE:NBE:PBE)
These figures represent the ratio while sententiously passing Sub BE, Normal BE and Priority BE marked traffic.

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Recognised Expert
Message 2 of 3

Re: Noise Margin Faults

You cannot change the noise margin in your HH. There are 3rd party routers which allow you to change the noise margin but you really need to eliminate the source of the noise.
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Distinguished Sage
Distinguished Sage
Message 3 of 3

Re: Noise Margin Faults

are you connected to the master or test socket or somewhere else?  you are on 21CN but currently only adsl2 and not adsl2+ (992.3 and not 992.5)  Your connection has been stable for 7days and If it was mine I would make sure I was in test socket and then I would reset my hub between 11 and 2pm but just once.


Adjusting the noise margin (with netgear) works with adslmax but from personal experience does not have the same effect on 21CN adsl2/2+

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