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Standard User juzza10
(newbie) Fri 29-Mar-13 13:15:13
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Poor broadband speeds on ADSL2+


[link to this post]
 
Hi All,
I have been with TalkTalk for over a year and typically get about 5Mbit download on a 6db SNR connection over ADSL2+. However my line seems to be quite unstable and i get frequent (1-2 a day) disconnects.
I have looked at my router stats (D-Link DSL-2680) and it says that my line is 38dB attenuation but from reading on the forums my sync speed should be much higher.

Can anyone advise on what the problem might be?

Here are my router stats:

Mode: ADSL2 PLUS
Type: ANNEX_A
Status: Showtime

Downstream Upstream
Rate (Kbps): 6678 kbps 548 kbps

SNR Margin (dB): 4.2 5.3
Attenuation (dB): 38.0 17.7
Output Power (dBm): 0.0 12.3

Super Frames: 462795 462796
RS Correctable Errors: 50338 0
RS Uncorrectable Errors: 358 65494

HEC Errors: 9405 0
Total Cells: 89232 120329
Data Cells: 430773 190846
Bit Errors: 0 0


Thanks
Justin
Administrator MrSaffron
(staff) Fri 29-Mar-13 15:39:22
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Re: Poor broadband speeds on ADSL2+


[re: juzza10] [link to this post]
 
Have you also grabbed stats from the test socket, to see if extension wiring is impacting sync speed

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 juzza10
(newbie) Fri 29-Mar-13 19:20:27
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Re: Poor broadband speeds on ADSL2+


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

I have had it running from the test socket and a similar attenuation was obtained.
What are your thoughts on the stats?

Cheers
Justin


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Standard User 4M2
(fountain of knowledge) Fri 29-Mar-13 19:50:58
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Re: Poor broadband speeds on ADSL2+


[re: juzza10] [link to this post]
 
In reply to a post by juzza10:
Hi

I have had it running from the test socket and a similar attenuation was obtained.
What are your thoughts on the stats?


Attenuations should be the same, what about the rest of the stats?
Standard User Seansmit17
(eat-sleep-adslguide) Sat 30-Mar-13 06:13:53
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Re: Poor broadband speeds on ADSL2+


[re: juzza10] [link to this post]
 
Looks like something is knocking your SNR down. Sync speed is defo lower that it should be for your attenuation.

Now you say the attenuation is similar when connected to the test socket, But what was the attenuation?

TalkTalk 24Mb
Current Line Status

Connection Speed 24575 Kbps 1019 Kbps
Line Attenuation 14.2 dB 5.5 dB
Noise Margin 1.2 dB 11.8 dB

BT 8Mb
Virgin 50Mb
BT 7Mb

Other ISP's used over the years: AOL Supanet Pipex Tiscali Eclipse Zen
Standard User juzza10
(newbie) Sat 30-Mar-13 14:40:57
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Re: Poor broadband speeds on ADSL2+


[re: Seansmit17] [link to this post]
 
Hi,

The attenuation is typically 1-2dB lower when plugged directly into the master socket. I dont have the other stats to hand at the mo so will have to plug my router into the master socket again.

Is there anything in my current stats that are pointing to an issue?

Cheers
Justin
Standard User yarwell
(sensei) Sat 30-Mar-13 15:47:33
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Re: Poor broadband speeds on ADSL2+


[re: juzza10] [link to this post]
 
Compared to the below you're not getting a good speed for the attenuation, especially upstream Full stats from test socket would help, also try it in ADSL2 and G.dmt modes via http://192.168.1.1/adslcfg.html to see if they do better (unlikely, but worth a try).

Downstream Upstream
Rate (Kbps): 6426 kbps 961 kbps

SNR Margin (dB): 9.6 8.8
Attenuation (dB): 47.0 23.7
Output Power (dBm): 0.0 12.3

Super Frames: 18811148 18811149
RS Correctable Errors: 58231 65329
RS Uncorrectable Errors: 890 65504

HEC Errors: 9338 0
Total Cells: 1771943 542672
Data Cells: 52984247 11798664
Bit Errors: 0 0

Connection Up Time : 3:17:14:04

--

Phil

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

MaxDSL diagnostics
Standard User flippery
(member) Sat 30-Mar-13 16:15:19
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Re: Poor broadband speeds on ADSL2+


[re: juzza10] [link to this post]
 
Difficult to call. I know, from experience, TT do not like customers to be on adsl2. I had to move to facilitate.
Interesting in what BT tester shows. http://www.speedtest.btwholesale.com/. Complete test then "further diagnostics" button . Min - Max Up and down and your line info.
Maybe the low snr is causing disconnects.
For your line, the speeds are more like adslmax business than adsl2
Would expect to see 10 down and 1 up on your attenuation.
Standard User Myth
(committed) Sun 31-Mar-13 14:37:06
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Re: Poor broadband speeds on ADSL2+


[re: flippery] [link to this post]
 
not quite sure what you mean about TT not "liking" ADSL2. Do you mean as a company they manipulate the exchange hardware to reject that type of modulation? Or that TTs MSANs are less capable of ADSL2 modulation than other ISPs hardware?

edit: am on a long line myself, and g.dmt is normally what mode my routers settle at (3.5mbit/1mbit ish) so am not disagreeing as such, just wondering what you mean smile

In theory, theory and practice are identical.....in practice they aren't!

Edited by Myth (Sun 31-Mar-13 14:39:08)

Standard User juzza10
(newbie) Sun 31-Mar-13 17:17:52
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Re: Poor broadband speeds on ADSL2+


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

Just tried the Bt speed test but it says that the test cant currently be performed. One thing to note is that my SNR is currently set to 6dB (i requested this from TT). Sometimes the SNR can drop to 2dB during peak times (evenings) etc.
Do you think my issue could be that I have a noisy line? I live on the edge of a village on a street with about 25 houses. Ita fairly new development and Im wondering if BT made a bit of a hash job with the quality of the connections etc when they installed the cabling.

Cheers
Justin
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