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Line stats and figures, good/bad, what does it mean ( error seconds etc etc)

pint
Grafter
Posts: 380
Thanks: 6
Registered: 19-08-2007

Line stats and figures, good/bad, what does it mean ( error seconds etc etc)

I've got a moderate understanding of things such as Atenuation, attainable rate and actual speed, however when ive tried to find an explanation of things such as error seconds and if a certain figure is "good" or "bad" i hit a brick wall

 

These are my line stats from a Billion Bipac 8800nl r2 router on plusnets ADSL2+ service, any comments

 

Mode ADSL_2plus
Traffic Type ATM
Status Up
Link Power State L0
 
  Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 0.8 6.1
Attenuation (dB) 24.5 13.7
Output Power (dBm) 0.0 12.4
Attainable Rate (Kbps) 17908 1220
 
Rate (Kbps) 17523 1211
 
MSGc (# of bytes in overhead channel message) 51 12
B (# of bytes in Mux Data Frame) 207 37
M (# of Mux Data Frames in FEC Data Frame) 1 1
T (Mux Data Frames over sync bytes) 3 4
R (# of check bytes in FEC Data Frame) 0 0
S (ratio of FEC over PMD Data Frame length) 0.3792 0.9967
L (# of bits in PMD Data Frame) 4388 305
D (interleaver depth) 1 1
Delay (msec) 0 0
INP (DMT symbol) 0.00 0.00
 
Super Frames 0 0
Super Frame Errors 152243 3616
RS Words 0 1106664
RS Correctable Errors 0 0
RS Uncorrectable Errors 0 0
 
HEC Errors 345032 5325
OCD Errors 2588 0
LCD Errors 2588 0
Total Cells 346936904 3877573183
Data Cells 2656809202 109955709
Bit Errors 4699150 86203
 
Total ES 98036 2075
Total SES 364 0
Total UAS 264 264
 

  

 

ADSL BER Test -- Result
The ADSL BER test completed successfully.
Test Time 60 seconds
Total Transferred Bits 0x0000000038C16180
Error Ratio 0.00e+00
3 REPLIES
Community Veteran
Posts: 38,253
Thanks: 940
Fixes: 56
Registered: 15-06-2007

Re: Line stats and figures, good/bad, what does it mean ( error seconds etc etc)

The only thing which really stands out is the downstream noise margin which implies a default noise margin of 3dB and is probably the reason for the high error seconds

You could try installing DSL Stats http://forum.kitz.co.uk/index.php/topic,17593.0.html and look at the error rates and noise margin changes

JayG
Aspiring Pro
Posts: 876
Thanks: 48
Fixes: 1
Registered: 30-10-2011

Re: Line stats and figures, good/bad, what does it mean ( error seconds etc etc)

Error seconds is the main measure by which the DLM decides to make (or not make) adjustments to the line parameters to try to stabilise the connection at the best possible speed.

Although the number showing on your connection is very high, there is also the uptime those ES were accumulated over to consider, especially if your router is one of those which doesn't reset the ES count on a resync (as distinct from a reboot, which would reset the ES count.)

You haven't said whether you are actually experiencing poor throughput or dropouts on your connection  - you could make a case for leaving everything as it is if it seems to be performing well.

Because the DLM seems to insist on a 3dB target SNRM on my connection despite a 5dB D/S SNR drop every evening after dark (search me Roll eyes) I manually resynched after dark 18 days ago and now have a 8-9dB SNRM during daylight hours, and 3-4 after dark, which means the connection is currently stable, albeit with a slightly lower sync speed.

If you are worried about your ES count you could try an after-dark resync to try to increase the SNR headroom it is operating with if you don't mind sacrificing a bit of speed (not much point doing that if you know your last resync was actually after dark though!)

Apprentice
Grafter
Posts: 614
Registered: 04-11-2008

Re: Line stats and figures, good/bad, what does it mean ( error seconds etc etc)