DSL Actual vs DSL Maximum Rate

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2 total messages Started by "Speedcheese" Wed, 16 Aug 2006 18:02

#99637

Author: "Speedcheese"
Date: Wed, 16 Aug 2006 18:02

54 lines
2331 bytes

I wonder whether anyone can shed any light on this ? I have a Vigor 2600 
router that gives the following output:


  --------------------------- ATU-R Info (annex 
A) ----------------------------
   Running Mode            :    G.DMT       State                : SHOWTIME
   DS Actual Rate          :  5184000 bps   US Actual Rate       :   416000 
bps
   DS maximum Rate         :  6688000 bps   US maximum Rate      :   512000 
bps
   DS Path Mode            :  Interleave    US Path Mode         : 
Interleave
   NE Current Attenuation  :    31.0  dB    Cur SNR Margin       :    10.0 
dB
   DS actual PSDM(C)       : 00000007       US actual PSDM(R)    : 000037ab
   ADSL Firmware Version   : 41e2be2c
  -------------------------------- ATU-C 
Info ---------------------------------
   Far Current Attenuation :    18.5  dB    Far SNR Margin       :    14.0 
dB
   CO ITU Version[0]       : 00ff4753       CO ITU Version[1]    : 504e0008
   DSLAM CHIPSET VENDOR    : < Unknown >
  -----------------------------------------------------------------------------
   INTL, DSTREAM bytes/depth=  32, symbols/codewords  =   0, latency= 
0*0.25ms.
       , USTREAM bytes/depth=   1, symbols/codewords  =   0, latency= 
0*0.25ms.
   CODE, DSTREAM fast parity bytes=   0, fast codeword=   0.
         DSTREAM intl parity bytes=  16, intl codeword= 179.
   CODE, USTREAM fast parity bytes=   0, fast codeword=   0.
         USTREAM intl parity bytes=  16, intl codeword= 240.
   Setting>>
       FDQ : Enable, TCM : Enable, EC : Disable, Framing Mode : 3.
   Running>>
       FDQ : In Use, TCM : In Use, EC :    Off.
       DS : Framing Mode 3, US : Framing Mode 3.
   ADI ADSL Firmware Version: 41e2be2c

Now, my question is this: what is the difference between DS Maximum Rate and 
DS Actual Rate ? Can I ever attain the maximum rate and, if so, how ? I'm 
guessing the answer lies somewhere in the SNR or Attenuation figures, but 
even here I'm not sure whether these are low or high.

My connection is with Plusnet and I maintain a fairly high stability rate so 
I'm not sure what else to do. One option (I'm told) is to take off 
Interleave (an option with Plusnet) but this just leads to reduced latency, 
not necessarily higher download speeds.

Any helps would be greatly appreciated.

(Chop the cheddar for personal replies)

Re: DSL Actual vs DSL Maximum Rate

#99983

Author: "PhilT"
Date: Sat, 19 Aug 2006 12:41

16 lines
570 bytes

Speedcheese wrote:

> Now, my question is this: what is the difference between DS Maximum Rate and
> DS Actual Rate ? Can I ever attain the maximum rate and, if so, how ? I'm
> guessing the answer lies somewhere in the SNR or Attenuation figures, but
> even here I'm not sure whether these are low or high.

the maximum rate is likely to be at either 6 dB or 0 dB SNR margin, so
it would be faster but less reliable. Also there is a speed penalty
from interleaving that shows as a difference between actual and maximum
rates even if you are at the same margin.

Phil

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