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Longshanks
Aspiring Expert
580 Views
Message 1 of 9

Difference between noise margin and noisy line

Hi

 

This issue has always bugged me. Am transferring to BT Infinity next week from Sky and have mixed feelings. We live a fair way from the exchange so line attenuation is a problem but we mange to get 3.5-4Mb with absolutely zero outage using the Sky unlimited package. Our current router stats are posted below and I woud be grateful for your interpration of the noise margin figs. Is the 7db download commensurate with a quite and stable connection that bodes well for Infinity? I'm curious cos our phone line is noisy with much background niose despite the fact that we don't have any fancy gadgets and use filters just about everywhere.

 

I'd just like your views on noise on the line versus noise margin for broadband and how each might impact on Infinity when we're connected next week.

 

Many thanks for your time.

 

Router Statistics

System Up Time: 05:44:16

Port Status TxPkts RxPkts Collisions Tx B/s Rx B/s Up Time WAN LAN WLAN
PPPoA4030553698510142611320305:42:39
100M/Full3702394157810135271489005:44:11
11M/54M886400150005:43:58
ADSL Link Downstream Upstream Connection Speed Line Attenuation Noise Margin
4093 kbps796 kbps
51 db28 db
4 db14 db
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8 REPLIES 8
Longshanks
Aspiring Expert
579 Views
Message 2 of 9

Re: Difference between noise margin and noisy line

Note the deliberate mistake. Should be 4Db but it's been 7 for the last few weeks!

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Distinguished Sage
572 Views
Message 3 of 9

Re: Difference between noise margin and noisy line

Your phone line should be completely silent if your phone service is with BT try a quiet line test using 17070 option 2 preferably using a corded phone the line should be silent apart from the announcement quiet lie test
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Longshanks
Aspiring Expert
546 Views
Message 4 of 9

Re: Difference between noise margin and noisy line

Thanks

 

Will try and report back.

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pcfarrar
Aspiring Expert
537 Views
Message 5 of 9

Re: Difference between noise margin and noisy line

Your current line stats don't really matter for Infinity, the only important factor is the distance between your house and the street cabinet.

 

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hamish72
Recognised Expert
526 Views
Message 6 of 9

Re: Difference between noise margin and noisy line

Enter your attenuation here  http://www.kitz.co.uk/adsl/max_speed_calc.php

Results are approximate

**************************************************
If any post helps tick the star box on the left
**************************************************
Just cause Im paranoid dont mean they are not out to get me





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Longshanks
Aspiring Expert
490 Views
Message 7 of 9

Re: Difference between noise margin and noisy line

Many thanks but this speed tester refers to all the ADSL 2 permutations (21Cn etc etc which were all predictably around 4Mb). I'm having Infinity installed so hopefully the only relevant attenuation is that from the cabinet to the house which is about 200 yeard max.

 

Have I got that right?

 

Many thanks

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hamish72
Recognised Expert
482 Views
Message 8 of 9

Re: Difference between noise margin and noisy line

Only 100% right   as it fibre to the nearest cabinet its distance from that cabinet that matters

**************************************************
If any post helps tick the star box on the left
**************************************************
Just cause Im paranoid dont mean they are not out to get me





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Longshanks
Aspiring Expert
470 Views
Message 9 of 9

Re: Difference between noise margin and noisy line

Many thanks

 

Will assume that I'll get 37.5Mb as promised with no outage then.Smiley Wink

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