General Discussion
  >> Broadband Not-spots & slow-spots


Register (or login) on our website and you will not see this ad.


  Print Thread
Standard User jefferp
(newbie) Thu 09-Jan-14 19:28:28
Print Post

0.96Mbps


[link to this post]
 
Hi,

My download speed recently fell to 712Kbps, despite having previously being able to achieve just over ~3Mbps, but over the course of a year, fell to just over 1Mbps. BT refused to acknowledge any issue as I was over 1Mbps. Router was connected to master socket via ADSL Nation filter (50cm from where the line drops into the house), no extensions. BT Openreach (boost "engineer") attended at the beginning of the week, they switched the master socket for an NTE5 and I believe an RFI filter into the junction box before the NTE5. There was a negligble increase, and I have also now replaced router (Netgear DGN1000) for a Billion 7800N. Current router stats are:

Operational Mode ADSL2
Upstream 136
Downstream 1243
SNR Margin(Upstream) 2.4
SNR Margin(Downstream) 6.3
Line Attenuation(Upstream) 34.4
Line Attenuation(Downstream) 54.5

SNR downstream is typically 6.0 - 6.3

BTW Performance test indicates d/l speed 0.96Mbps, IP profile 1.1Mbps

Coolwebhome indicates 3100Kbps to 3800Kbps should be achievable in ADSL2 mode, upto 4450Kbps ADSL2+ at this attenuation.
http://www.coolwebhome.co.uk/calc/index.php?param=RG...

I am on the Pembury exchange (NDPEM), 4.4Km from exchange.

Is there anything I can take up with BT to improve, or forever now stuck with a sub 1Mb service.

Many thanks in advance for any advice.

regards,
Paul
Administrator MrSaffron
(staff) Fri 10-Jan-14 13:59:48
Print Post

Re: 0.96Mbps


[re: jefferp] [link to this post]
 
Upstream should be a lot better particularly for the length of line.

Has upstream speed always been that low - usually is an indication of a filtering issue, e.g. sky box with no filter, or that the RFI filter is causing problems (only RF3 BT filters work with ADSL, older ones can reduce the speed)

What are the stats when using the test socket - rather than the master socket.

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk

Edited by MrSaffron (Fri 10-Jan-14 16:29:54)

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User jefferp
(newbie) Fri 10-Jan-14 16:10:09
Print Post

Re: 0.96Mbps


[re: MrSaffron] [link to this post]
 
I hadn't been concentrating on upstream, but now that you've drawn my attention to it, I don't think it has been that low. I've no previous recorded measurement to base that conclusion on though.

There's no extension or other telephony to the NTE5 except a DECT base.

The Openreach engineer measured the sync from where the line enters the house, almost identical to master. I will re-run again from test. Is there a way to identify the RFI3? Only reference on Google (first page) is from 2005! The engineer did not inspire much confidence anyway, he was pleasant, but had been with BT for 3 years - electrician by trade.

Will post test socket stats.

Cheers.
Paul


Register (or login) on our website and you will not see this ad.

Administrator MrSaffron
(staff) Fri 10-Jan-14 16:31:22
Print Post

Re: 0.96Mbps


[re: jefferp] [link to this post]
 
First morning back - but a typo should have been RF3, older and less good ones are the RF1 & RF2 - these filter too much of the ADSL signal.

http://www.run-it-direct.co.uk/BT80ARF2.html gives pictures and suggests easy to identify model

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 jefferp
(newbie) Fri 10-Jan-14 16:46:13
Print Post

Re: 0.96Mbps


[re: MrSaffron] [link to this post]
 
hmmn, that's not what he fitted. It looked like a small PCB which he used a Krone tool to fit into the original junction box (which looks ancient to those on the link).

Will take the top off it tomorrow to investigate...
Administrator MrSaffron
(staff) Sat 11-Jan-14 00:43:10
Print Post

Re: 0.96Mbps


[re: jefferp] [link to this post]
 
A clear picture will help people identify it

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 jefferp
(newbie) Sat 11-Jan-14 18:15:42
Print Post

Re: 0.96Mbps


[re: MrSaffron] [link to this post]
 
Hi,

The junction box is definitely an RF3.

The new box (faceplate) is actually a VDSL2, but I removed it and tested with the following:

Test socket, ADSL Nation ADSL filter:

DSP Firmware Version A2pB025f.d22k
DMT Status No Defect
Operational Mode
ADSL2
Upstream 136
Downstream 1383
SNR Margin(Upstream) 5.6
SNR Margin(Downstream) 6.1
Line Attenuation(Upstream) 34.1
Line Attenuation(Downstream) 56.0

I then disconnected, put the VSDL2 faceplate back on, rebooted router:

DSP Firmware Version A2pB025f.d22k
DMT Status No Defect
Operational Mode
ADSL2
Upstream 140
Downstream 1235
SNR Margin(Upstream) 6.0
SNR Margin(Downstream) 6.4
Line Attenuation(Upstream) 34.3
Line Attenuation(Downstream) 54.5

Many thanks,
Paul

Edited by jefferp (Sat 11-Jan-14 18:36:39)

Standard User jefferp
(newbie) Thu 16-Jan-14 11:28:18
Print Post

Re: 0.96Mbps


[re: jefferp] [link to this post]
 
Hello MrSaffron,

Would be very grateful and appreciative of your opinion.

Many thanks in advance,
Paul
Administrator MrSaffron
(staff) Thu 16-Jan-14 11:49:16
Print Post

Re: 0.96Mbps


[re: jefferp] [link to this post]
 
Hard to be 100% but looks like banding may have been applied, or alternatively there is a very bad source of noise locally.

The noise source could be as simple as the power supply for a mobile phone charger, or a plasma TV. It may not even be in your property.

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.
  Print Thread

Jump to