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Aspiring Contributor
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Message 1 of 12

Should I be worried about my Noise Margin for going from ADSL to ADSL2+?

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Hi

 

Newbie poster so apologies if I get all the etiquette wrong!

 

My local exchange (Haddington, East Lothian - ESHAD) has been\is due to be upgraded to ADSL2+ by the end of March 2012.

 

I have been really looking forward to this but I am not sure what, if any, DL improvements I am likely to get.

 

According to KITZ Max Speed Calculator I should get a 21CN upgrade estimate of 18688kpbs based on an attenuation of 24dB.  That would be dreamland for me.

 

However, I have read that the Noise Margin is more important for ADSL2+ than ADSL and that could bring my speed down a lot.

 

I really don't know much about this area so I have no idea if Noise Margin is something I can change\get changed but my current stats for my Home Hub for ADSL look like this:

 

ADSL settings

VPI/VCI - 0/38

Type - PPPoA

Modulation - ITU-T G.992.1

Latency type - Fast

Noise margin (Down/Up) - 7.3 dB / 24.0 dB

Line attenuation (Down/Up) - 24.0 dB / 12.5 dB

Output power (Down/Up) - 19.8 dBm / 12.3 dBm

Loss of Framing (Local) - 0

Loss of Signal (Local) - 0

Loss of Power (Local) - 0

FEC Errors (Down/Up) - 0 / 0

CRC Errors (Down/Up) - 17 / 2147480000

HEC Errors (Down/Up) - nil / 0

Error Seconds (Local) - 15

 

So, my basic questions are:

 

Will I be OK when I go ADSL2+ or is there any data here that would stop me getting improved speeds?

 

If all looks OK, can I really expect anything close to 18Meg?

 

If there is anything of concern, is there anything I can do to address it?

 

Many Thanks for any help.

 

Best Regards

 

Dezza

 

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Distinguished Sage
Distinguished Sage
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Message 2 of 12

Re: Should I be worried about my Noise Margin for going from ADSL to ADSL2+?

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Your current noise margin and error rate is fine. You are not showing your connection speed on those statistics.

 

Distinguished Sage
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Message 3 of 12

Re: Should I be worried about my Noise Margin for going from ADSL to ADSL2+?

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Looks fine to me
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Distinguished Sage
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Message 4 of 12

Re: Should I be worried about my Noise Margin for going from ADSL to ADSL2+?

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all looks ok at this time you need to add is 2 db to your attenuation for adsl2+ eg making your attenuation 20db
Aspiring Contributor
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Message 5 of 12

Re: Should I be worried about my Noise Margin for going from ADSL to ADSL2+?

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Sorry - here it is.

 

Thank you Keith!

 

ADSL line status

Connection information

Line state - Connected

Connection time - 0 days, 7:18:04

Downstream - 8,128 Kbps

 

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Distinguished Sage
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Message 6 of 12

Re: Should I be worried about my Noise Margin for going from ADSL to ADSL2+?

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ok did you restart your hub ??
Aspiring Contributor
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Message 7 of 12

Re: Should I be worried about my Noise Margin for going from ADSL to ADSL2+?

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Hi John.

 

My Hub was in an error state this morning (WiFi and Broadband lights are yellow) so I restarted it then.

 

Think exchange has been updated but my line hasn't yet!  Had some fairly painful calls with BT to try and speed up my line upgrade.

 

Thanks

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Distinguished Sage
Distinguished Sage
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Message 8 of 12

Re: Should I be worried about my Noise Margin for going from ADSL to ADSL2+?

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@Dezza wrote:

Sorry - here it is.

 

Thank you Keith!

 

ADSL line status

Connection information

Line state - Connected

Connection time - 0 days, 7:18:04

Downstream - 8,128 Kbps

 


You are running at maximum utilisation, which indicates there are no issues with your line, so I would not worry about it.

Distinguished Sage
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Message 9 of 12

Re: Should I be worried about my Noise Margin for going from ADSL to ADSL2+?

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hi be aware the update of the exchange is an estimate also not all lines go over to adsl2+ at the same time they are done in batches and can take from a few days to a few months to be moved over
Recognised Expert
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Message 10 of 12

Re: Should I be worried about my Noise Margin for going from ADSL to ADSL2+?

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@Dezza wrote:

 

Will I be OK when I go ADSL2+ or is there any data here that would stop me getting improved speeds?

 

If all looks OK, can I really expect anything close to 18Meg?

 

If there is anything of concern, is there anything I can do to address it?

 

 



You should be okay, but we can't say for sure until you are switched over, because any noise issues will be more noticeable when on ADSL2+. There is no evidence of any problems on your line at the moment though.

 

You should get around 18Meg if your line performs well in the 10-day Training Period.

 

If you are very lucky and your line doesn't have any noise issues, the DLM may try you on the new 3dB Target Noise Margin :D, which may give you more speed than the standard 6dB Margin.

 

 

You may be looking at around another 2 months before you are switched over, depending on when the batch your line is in, is due to be switched over to the new equipment. 

 

Make sure that when you are switched over, you don't restart your hub as it could disrupt the line training.

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