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Standard User tivo_lad
(learned) Sat 04-Oct-14 16:12:58
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Would Fibre Roll Out impact ADSL Speeds?


[link to this post]
 
FTTC is currently being deployed from my local exchange (Heckington - EMHECKI) as part of the OnLincolnshire project. Being out in the sticks, I'm on the end of a relatively long line (c.3Km) but have been able to maintain a pretty stable sync speed of about 8.5Mbps which equates to a throughput of about 7.5Mbps. This is supported by data from the SamKnows monitor I have on my line which has shown a pretty stable average of 7.5Mbps since the start of this year.

In the last month (since the work started on the upgrade) I've seen a significant drop in overall throughput of about 40% so 7.5Mbps has become about 5Mbps and sometimes less than 4Mbps. I contacted my ISP who advised that some noise had been detected and that a restriction had been put on the line. That would be lifted and the line should return to normal. However, in the two weeks since, the sync speed hasn't risen above 6Mbps. Current stats are as follows:

Downstream
Connection Speed: 6073 kbps
Line Attenuation: 41.0 db
Noise Margin: 9.6 db

Upstream
Connection Speed: 1108 kbps
Line Attenuation: 21.9 db
Noise Margin: 6.5 db

I also note from the OnLincolnshire Project Website that the Cabinet that my line is connected to (Cabinet 2) was upgraded as of Friday 3rd October.

Is it possible that the FTTC upgrade work has somehow impacted the quality of my line and if so, is there anything that I can do about it? Would the increased noise on the line would also impact any speed improvement I might see if I were to upgrade to FTTC? The BT Wholesale checker reckons I might get 8Mbps on FTTC but that's not going to be much of an improvement if I can get back to the 7.5Mbps that I previously got before the upgrade work started.
Administrator MrSaffron
(staff) Sat 04-Oct-14 16:42:08
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Re: Would Fibre Roll Out impact ADSL Speeds?


[re: tivo_lad] [link to this post]
 
No more impact than the usual engineer working in a cabinet might affect another line scenario

The 9db noise margin explains drop in speed normally would be 6dB

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User flippery
(committed) Sat 04-Oct-14 16:53:09
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Re: Would Fibre Roll Out impact ADSL Speeds?


[re: MrSaffron] [link to this post]
 
There have been a number of posts here where Adsl speeds have reduced and coincidently Fibre has recently become live.


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Standard User tivo_lad
(learned) Sat 04-Oct-14 17:20:38
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Re: Would Fibre Roll Out impact ADSL Speeds?


[re: flippery] [link to this post]
 
So it's possible that the work has impacted my line. Is there anything I can do about it?
Standard User Oliver341
(eat-sleep-adslguide) Sat 04-Oct-14 20:10:47
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Re: Would Fibre Roll Out impact ADSL Speeds?


[re: flippery] [link to this post]
 
If anything, my own ADSL2+ connection speed has improved. Fibre may be reducing interference in ADSL2+ lines, since fibre doesn't produce any interference between the cabinet and the exchange.

Oliver.
Standard User professor973
(experienced) Sat 04-Oct-14 20:56:18
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Re: Would Fibre Roll Out impact ADSL Speeds?


[re: tivo_lad] [link to this post]
 
Both our connections have had their cabs wired ready for fibre switch om in the last few weeks. Enta in Suffolk and the dreaded EE in Hamilton.
Service on both has been all over the place with several disconnections. Coincidentally. both copper lines are now running a lot faster, which I can only put down previous bad joints/connections being worked on. So I would say fibre installation definitely effects a copper service.

Standard User RobertoS
(elder) Sat 04-Oct-14 21:39:27
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Re: Would Fibre Roll Out impact ADSL Speeds?


[re: tivo_lad] [link to this post]
 
The messing around seems to have caused a short-term fault. Assuming there are no ongoing noise problems that 9.6dB noise margin should reduce to 6dB within 10-14 days of it being set, and with luck to 3dB 10-14 days after that. To get to over 8Mbps sync I would think the noise margin was 3dB.

Each drop will cause an automatic re-sync at a considerably higher speed.

Until the first one doesn't occur very few ISPs will want to take any action on something the system is designed to handle itself.

Keep us posted, so we can advise further if the first one occurs. Or doesn't!

My broadband basic info/help site - www.robertos.me.uk | Domains,site and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 56.6/14.1Mbps @ 600m. - BQM

"Angels can fly because they can take themselves lightly." - G K Chesterton.

Edited by RobertoS (Sat 04-Oct-14 21:40:54)

Standard User adslmax
(knowledge is power) Sun 05-Oct-14 16:08:13
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Re: Would Fibre Roll Out impact ADSL Speeds?


[re: RobertoS] [link to this post]
 
I know BT set ADSL/ADSL2 SNR target at 6dB default. But, what about FTTC SNR target default set by BT?

Edited by adslmax (Sun 05-Oct-14 16:08:35)

Standard User professor973
(experienced) Thu 09-Oct-14 21:44:14
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Re: Would Fibre Roll Out impact ADSL Speeds?


[re: RobertoS] [link to this post]
 
Back down south today, only to find plenty of messing around on my Freeola Enta service. Lets hope it's down to blowing the fibre, but been ongoing for some tome now.
http://www.thinkbroadband.com/ping/share/9c0ab536e12...

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