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BT Speed profile - How do I improve it?

TornadoRush
Dabbler
Posts: 19
Registered: 12-05-2008

BT Speed profile - How do I improve it?

My line has been good to go at between ~ 4500k and 5500k  but recently my router has been rebooted a few times and now my IP profile is 3500.  Can anyone explain how this can be increased or what the factors are that affect the profile? 
Also I am currently waiting for interleaving be switched off and I wanted to find out if this has an effect on the profile too?
IP profile for your line is - 3500 kbps
    DSL connection rate: 832 kbps(UP-STREAM)  4896 kbps(DOWN-STREAM)
    Actual IP throughput achieved during the test was - 3235 kbps
Thanks in advance for any light you can shed!  Cheesy
12 REPLIES
VileReynard
Seasoned Pro
Posts: 10,911
Thanks: 256
Fixes: 10
Registered: 01-09-2007

Re: BT Speed profile - How do I improve it?

Interleaving should have no effect on your profile.
If you have very few errors, switching off interleaving will give a small increase in speed and a worthwhile decrease in ping times.
If you have many errors, switching off interleaving will drastically slow your speed.
4896 kbps(DOWN-STREAM) should give you a 4000Kbps profile.

Superuser
Superuser
Posts: 9,655
Thanks: 1,060
Fixes: 59
Registered: 06-04-2007

Re: BT Speed profile - How do I improve it?

Your IP Profile should increase automatically to 4000kbps in 3-4 days if you remain synced above 4544kbps throughout that period.
Unfortunately its the way maxDSL works.
David
TornadoRush
Dabbler
Posts: 19
Registered: 12-05-2008

Re: BT Speed profile - How do I improve it?

Thanks for the info. 
Would the following stats imply I have a high number of errors that will actually mean I have slower speeds when interleaving is switched off?  Undecided
Uptime - 36 hours
Mode: G.DMT 
Type: Interleave 
Line Coding: Trellis Off 
Status: No Defect 
 
  Downstream Upstream
Rate (Kbps): 4896  832 
 
SNR Margin (dB): 7.1  10.0 
Attenuation (dB): 47.0  27.0 
Output Power (dBm): 11.9  19.6 
 
Super Frames: 7686106  7686104 
Super Frame Errors: 738  157 
RS Words: 522655254  65331884 
RS Correctable Errors: 15019914  416 
RS Uncorrectable Errors: 11415  N/A 
 
HEC Errors: 670  137 
OCD Errors: 144  0 
LCD Errors: 0  0 
Total Cells: 1508778825  0 
Data Cells: 54271660  0 
Bit Errors: 0  0 

Some people suggest that rebooting the router at an off peak time could help but I have steered clear of rebooting unless there is no internet at all.  Roll eyes
Thanks in advance for any further help.
Smiley
VileReynard
Seasoned Pro
Posts: 10,911
Thanks: 256
Fixes: 10
Registered: 01-09-2007

Re: BT Speed profile - How do I improve it?

Probably you have a low error level(?) - you will have to try some before/after speed tests.
See http://www.kitz.co.uk/adsl/linestats_errors.htm

Superuser
Superuser
Posts: 9,655
Thanks: 1,060
Fixes: 59
Registered: 06-04-2007

Re: BT Speed profile - How do I improve it?

The number of RS Correctable Errors seems significant. With interleaving off these would become uncorrectable errors requiring retransmission - slowing down throughput.
However it's worth trying interleave off to see how you get on.
David
James
Grafter
Posts: 21,036
Registered: 04-04-2007

Re: BT Speed profile - How do I improve it?

I'd be inclined to leave interleaving on based on the number of uncorrected errors.
TornadoRush
Dabbler
Posts: 19
Registered: 12-05-2008

Re: BT Speed profile - How do I improve it?

Thanks for the help. I found the pages at Kitz a useful source of info and now I have a better understanding of the stats I will see what happens with the interleaving off option.  Thanks  Smiley
James
Grafter
Posts: 21,036
Registered: 04-04-2007

Re: BT Speed profile - How do I improve it?

Hiya,
I've placed the order for you now Smiley
TornadoRush
Dabbler
Posts: 19
Registered: 12-05-2008

Re: BT Speed profile - How do I improve it?

Thank you    Grin
James
Grafter
Posts: 21,036
Registered: 04-04-2007

Re: BT Speed profile - How do I improve it?

How is it behaving today?
TornadoRush
Dabbler
Posts: 19
Registered: 12-05-2008

Re: BT Speed profile - How do I improve it?

Hi
Had to reboot the router once, but its been stable for a couple of days and the speed difference is great.  I am getting nice low pings of 25ms which, along with a recent regrade of my line has brought my ping down from 75 to 40 and now after you switched interleaving off, 25 which is spot on. Played some PS3 games like UT3 where the ping times are crucial and I definately have the edge speed wise. I am not aware of problems with packet loss. The router stats show:
Mode: G.DMT 
Type: Fast 
Line Coding: Trellis On 
Status: No Defect 
 
  Downstream Upstream
Rate (Kbps): 5280  832 
 
SNR Margin (dB): 6.4  10.0 
Attenuation (dB): 47.0  27.0 
Output Power (dBm): 11.9  19.6 
 
Super Frames: 5883538  5883536 
Super Frame Errors: 5916  89 
RS Words: 0  0 
RS Correctable Errors: 0  0 
RS Uncorrectable Errors: 0  N/A 
 
HEC Errors: 2428  55 
OCD Errors: 16  1 
LCD Errors: 0  2 
Total Cells: 1245528562  0 
Data Cells: 24523923  0 
Bit Errors: 0  0 
 
Total ES: 2559  0 
Total SES: 38  0 
Total UAS: 14  0 
I think it has been beneficial to switch interleaving off and seeing as the line is stabilising I think this will be good.  I take it the stats aren't showing anything negative to suggest otherwise?
Thanks for your help with everything.
VileReynard
Seasoned Pro
Posts: 10,911
Thanks: 256
Fixes: 10
Registered: 01-09-2007

Re: BT Speed profile - How do I improve it?

The errors are good.
But wait a few weeks/months and BT will decide your equipment is **** and can only connect at sluggard-speed.
I'd recommend that you do regular speed tests (and ping tests if this is important to you).