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TiRich
Contributor
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Message 21 of 75

Re: Slow Internet - mods please assist.

I have set the Billion to a 6dB SNR target so that it can remain stable for a few days. If left in auto SNR it had taken the SNR down to 3dB without dropouts but increased error rates. I guess 

 

The line attenuation has always been 57-58dB with the HH5 but the Billion appears to be giving 55-56dB so improving the line slightly?

 

Interleaving has always been used on this line.

 

What is INP sorry?

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Distinguished Sage
Distinguished Sage
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Message 22 of 75

Re: Slow Internet - mods please assist.

the attenuation difference is negligible and will not change your conenction speed  interleaving is as high as it goes at 64 so must be correcting a lot of errors



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TiRich
Contributor
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Message 23 of 75

Re: Slow Internet - mods please assist.

right after 2 days and 20 hours the connection on ADSL2 has dropped. I have tried going back to ADSL and appear to be getting faster rates. Is this backwards step due to the poor line quality and the fact the line isnt good enough of ADSL2 or ADSL2+??

 

BT Wholesale Speed Test shows that there is still some margin, in theory,  to improve the speed but even with ADSL i am still getting errors

 

Results Image not loaded

 

 



1. Best Effort Test: -provides background information.

 Download  Speed
 2.4 Mbps
  
0 Mbps4 Mbps
Max Achievable Speed

 

 Download speedachieved during the test was - 2.4 Mbps
 For your connection, the acceptable range of speeds is 1.2 Mbps-4 Mbps.
 IP Profile for your line is - 2.51 Mbps


2. Upstream Test: -provides background information.

 Upload Speed
 0.44 Mbps
  
0 Mbps0.83 Mbps
Max Achievable Speed

 

Upload speed achieved during the test was - 0.44Mbps
 Additional Information:
 Upstream Rate IP profile on your line is - 0.83 Mbps

 

 

Router Data after 4 hours to show errors

 

Model NameBiPAC 8800NL
Host Namehome.gateway
System Up-Time0D 4H 20M 53S
ModeADSL_G.dmt
Traffic TypeATM
StatusUp
Link Power StateL0
 
 DownstreamUpstream
Line Coding (Trellis)OnOn
SNR Margin (dB)6.97.0
Attenuation (dB)55.531.5
Output Power (dBm)17.912.6
Attainable Rate (Kbps)2932820
 
Rate (Kbps)2848640
 
K (number of bytes in DMT frame)9021
R (number of check bytes in RS code word)816
S (RS code word size in DMT frame)2.002.00
D (interleaver depth)162
Delay (msec)8.004.00
INP (DMT symbol)0.340.05
 
Super Frames920104920104
Super Frame Errors6487
RS Words312835197821504
RS Correctable Errors86785525
RS Uncorrectable Errors11290
 
HEC Errors3847
OCD Errors00
LCD Errors00
Total Cells1050655110
Data Cells350633700
Bit Errors296500
 
Total ES5990
Total SES00
Total UAS1212

 

Any suggestions to improve and are these error levels OK or not???

 

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Distinguished Sage
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Message 24 of 75

Re: Slow Internet - mods please assist.

you may have change the mod but still looks like adsl2

 

your interleaving septh has reduced hence why errors have increased but as long as conenction stable and download speed consistent with profile then looks ok.  from the stats your connection speed is almost at attainable so can't see any more scope at present



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Distinguished Guru
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Message 25 of 75

Re: Slow Internet - mods please assist.

I agree with imjolly. You may have tried overriding the modulation mode to ADSL on the router-modem but it looks like the Openreach and BT Wholesale equipment doesn't care about that and you are on ADSL2/2+.

ADSL1 uses certain set down IP profiles that certain ranges of down connection rate map onto.

ADSL2/2+ uses a down IP profile that is set to 88.2% of the down connection rate. This is true in your case.

The max attainable connection rates will vary a bit and depends on conditions at the time when you view the stats. Similarly the actual connection rates will depend on the state of things at sync time.

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Distinguished Guru
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Message 26 of 75

Re: Slow Internet - mods please assist.

You said earlier that on auto the noise margin dropped to 3dB. Auto may actually mean that it uses the targets set by the DLM. That's the normal process.

The DLM will reduce the sync time target to 3dB if the line is stable enough. A lower sync time noise margin will result in a higher connection rate. If however the sync time level was around 6dB and then it just dropped to around 3dB several hours later due to increased noise then that's a different situation.


Does your router record the sync time noise margins in the log?

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Distinguished Guru
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Message 27 of 75

Re: Slow Internet - mods please assist.

Does your router work with the RouterStats free monitoring software? If so running that on a PC can automatically log stats and produce some useful charts.
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Distinguished Guru
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Message 28 of 75

Re: Slow Internet - mods please assist.

The down IP profile limits your speed. I'm not sure why the speedtest result gives a range maximum of 4Mbps (rather than 2.51Mbps)?
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Distinguished Guru
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Message 29 of 75

Re: Slow Internet - mods please assist.


@umpire wrote:
The down IP profile limits your speed. I'm not sure why the speedtest result gives a range maximum of 4Mbps (rather than 2.51Mbps)?

 

It does a similar thing with my current ADSL2+ connection, but gives a range of 4 - 21Mbps.

 

 

Download speed achieved during the test was - 14.47 Mbps
For your connection, the acceptable range of speeds is 4 Mbps-21 Mbps.
IP Profile for your line is - 14.97 Mbps

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Distinguished Sage
Distinguished Sage
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Message 30 of 75

Re: Slow Internet - mods please assist.

and often with adslmax it shows 0.6 - 7.15mb



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