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Standard User Andrue
(knowledge is power) Thu 20-Jun-13 19:52:52
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Noise margin drops when phone is active


[link to this post]
 
I don't use my phone much but I've just noticed that when the line is active my noise margin drops from 6db to 5.4db. Considering I have the usual FTTC faceplate, shouldn't that be 'impossible'?

---
Andrue Cope
Brackley, UK
Standard User RobertoS
(sensei) Thu 20-Jun-13 20:31:55
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Re: Noise margin drops when phone is active


[re: Andrue] [link to this post]
 
Quite normal.

There's nothing special about the FTTC faceplate, it's just the same as any other filter or filtered faceplate, though it is said that the filter specification is slightly higher.

Mine drops by nearly as much as it did on ADSL2+. I forget what it is, but much more than yours.

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 53.4/16.8Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Standard User StephenTodd
(experienced) Thu 20-Jun-13 20:34:17
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Re: Noise margin drops when phone is active


[re: Andrue] [link to this post]
 
I don't think it would be impossible. It is a filtered faceplate. A filter filters things, but doesn't necessarily completely block them.

Is it a cordless phone or a corded one? I can imagine some small 'crackle' noise getting through from a corded one, and maybe quite a bit of low RF noise from a cordelss.

--
Moved (with trepidation turned relief) to BT Infinity 2 for upload speed. Happy BE user for several years.


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Standard User lockyatlrg
(fountain of knowledge) Thu 20-Jun-13 21:06:41
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Re: Noise margin drops when phone is active


[re: RobertoS] [link to this post]
 
I get a 0.1 drop when my phone is on, nothing tbh.

BT Infinity
ROUTER:-Netgear WNDR37AV
JDSU Stats
Attainable 105977D 38659U
Sync 79999D 20000U
Attenuation: 5.4 SNR: Down 13.1 Up 24.3
Line Length 160meters
Standard User RobertoS
(sensei) Thu 20-Jun-13 21:09:04
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Re: Noise margin drops when phone is active


[re: lockyatlrg] [link to this post]
 
But what did you get on ADSLx?

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 53.4/16.8Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Standard User Zarjaz
(knowledge is power) Thu 20-Jun-13 21:35:47
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Re: Noise margin drops when phone is active


[re: Andrue] [link to this post]
 
'tis nothing Sir. Not worth worrying about.

Standard User yarwell
(sensei) Fri 21-Jun-13 09:17:43
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Re: Noise margin drops when phone is active


[re: Andrue] [link to this post]
 
no filter is 100% and you are changing the system slightly when you pick the phone up.

--

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
Standard User Andrue
(knowledge is power) Fri 21-Jun-13 10:14:52
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Re: Noise margin drops when phone is active


[re: Andrue] [link to this post]
 
Okay, thanks chaps. I wasn't worried - just a bit surprised. I actually checked because when I picked the phone up there was a godawful 'modem-like' noise for a couple of seconds. Never done it before and I couldn't replicate it either. No idea if it was at my end or the other. The other caller just heard silence until the fault cleared.

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Andrue Cope
Brackley, UK
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