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Standard User AndrewUK
(committed) Fri 09-Nov-12 11:30:13
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Re: Openreach fibre modem IP address


[re: MrSaffron] [link to this post]
 
It is very thick copper. Commonly installed during the 70s/early 80s according to the chap which is around when the house was built.

The cable from the pole looks different - like the newer black cable they use. However that goes into a small box on the wall just underneath the guttering, and this old brown non twisted pair cable comes out of that. Probably 15-20 metres of it.

We used to lose about 3-4DB on the SNR on the ADSL2 line when the sun went down, although it was stable and never dropped. I've no way to get the line stats since the ECI modem is difficult to hack and I can't be bothered really. As long as it works smile

The stats must be fairly good if he reckoned it is capable of 117mbps, so hopefully there is enough spare capacity there not to drop the link at night when it's noisier...

--
Andrew
Administrator MrSaffron
(staff) Fri 09-Nov-12 11:38:44
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Re: Openreach fibre modem IP address


[re: MHC] [link to this post]
 
Is the night time noise floor as relevant at the frequencies VDSL2 uses? Certainly once into FM band (whcih VDSL is not, but closer to than ADSL) this effect seems to be less.

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User MHC
(sensei) Fri 09-Nov-12 11:51:09
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Re: Openreach fibre modem IP address


[re: MrSaffron] [link to this post]
 
I agree the VDSL it is not in the VHF / FM frequency band but the background radiation from those does not really change over night.

It is the many transmitters down in the LF, MF and HF bands that will be picked up and there are a lot of those around. Many years back I designed a small transmitter running at 2182 kHz - at night it could be received in Cyprus (from the North of Scotland) and further afield.


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M H C


taurus excreta cerebrum vincit


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Administrator MrSaffron
(staff) Fri 09-Nov-12 12:07:20
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Re: Openreach fibre modem IP address


[re: MHC] [link to this post]
 
Will try to do some RF reading over the weekend

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User MHC
(sensei) Fri 09-Nov-12 12:38:08
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Re: Openreach fibre modem IP address


[re: MrSaffron] [link to this post]
 
Typically an MF or HF transmitter range will double or treble over night. LF - 30 to 300kHz, MF - 300kHz to 3MHz and HF - 3 to 30 MHz. Radio 4 is on 1500metres or 198kHz, there are many European stations that can be received at night that transmit in the same band.


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M H C


taurus excreta cerebrum vincit
Standard User RobertoS
(sensei) Fri 09-Nov-12 12:43:04
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Re: Openreach fibre modem IP address


[re: MrSaffron] [link to this post]
 
My noise margin varies much less over 24 hours on FTTC than it did on ADSL & 2+. Less than 1dB, whereas it was a fairly consistent 3.5dB. The DECT phone still gives it a fair kicking though.

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet Extra Fibre (FTTC). Sync ~ 53.5/15.2Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.

Edited by RobertoS (Fri 09-Nov-12 12:43:36)

Administrator MrSaffron
(staff) Fri 09-Nov-12 12:46:39
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Re: Openreach fibre modem IP address


[re: MHC] [link to this post]
 
HF band is the key one for VDSL

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User AndrewUK
(committed) Fri 09-Nov-12 12:59:58
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Re: Openreach fibre modem IP address


[re: MrSaffron] [link to this post]
 
He told me I was only the 3rd connection in the cab aswell, so it will be interesting to see how crosstalk affects it as more people sign up.

--
Andrew
Standard User MHC
(sensei) Fri 09-Nov-12 13:11:10
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Re: Openreach fibre modem IP address


[re: MrSaffron] [link to this post]
 
In reply to a post by MrSaffron:
HF band is the key one for VDSL


For the top end downstream frequencies suffering high attenuation yes. However, even LF and MF will affect the lower end frequencies. I have seen Bin usage graphs of friends in the Elgin area (Hopeman and Lossiemouth exchanges) which have notches at 198, 693 and 810 kHz adversely affecting their ADSL upstream and downstream service.


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M H C


taurus excreta cerebrum vincit
Standard User MHC
(sensei) Fri 09-Nov-12 13:12:37
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Re: Openreach fibre modem IP address


[re: AndrewUK] [link to this post]
 
I have lost around 110-12 Mbps typically 15% from the maximum attainable.


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M H C


taurus excreta cerebrum vincit
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