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1828 posts

Uber Geek
Inactive user

#28190 22-Nov-2008 03:49
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does anyone in here suffer from this i find it really annoying im quite happily cruzing the net then o oh disconnect page timed out then reconnect refresh and oh no disconnect and up and down and up and down until it finally settles for and hour or two and then it starts all over again. sync rates are great but im not sure about the snr is it meant to be a larger or smaller number im confudled

ADSL State
Data Path Fast
Operation Mode G.dmt
Max. Bandwidth Down/Up(kbps) 4384 / 816
Bandwidth Down/Up(kbps) 4032 / 704
SNR Margin Down/Up(dB) 5.5 / 12.0
Attenuation Down/Up(dB) 56.5 / 31.5
Power Down/Up(dBm) 19.0 / 12.0
CRC Down/Up 14219/ 3
FEC Down/Up 0/ 19
HEC Down/Up 6379/ 15
System Up Time 36:46:01
DSL Up Time 0:21:18
PPP Up Time 0:21:17

but then on the other hand i have a Siemens speedstream 4200 says this (unfortunately it lacks a bit of info in comparison to the MT882)

Data Path Fast
Operation Mode G.dmt
Max. Bandwidth Down/Up(kbps) 2592 / 736
Bandwidth Down/Up(kbps) 2592 / 736
SNR Margin Down/Up(dB) 13.0 / ?.?
Attenuation Down/Up(dB) 50.0 / 31.5

and i have notice that at times the SNR can swing wildly from as little as 0.5db upto 13db anyone have an idea of what could be done i did ring telecom but im still waiting for them to do anything or evan get back to me about it

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8961 posts

Uber Geek

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  #179366 22-Nov-2008 09:26
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Hi, firstly line lengths over 4.5km are in very unstable territory and how one modem responds to such poor lines can vary wildly as you are now well out of intended service. In some countries (Aus for example) a line of 56dB would be refused DSL connection as it would be a cost burden to Telstra in service call outs.

You can trade off noise margin (S/N) for bandwidth, however as the noise margin reduces the stability of the connection becomes worse. Telecom normally set the DSLAMs to negotiate (with your modem) a noise margin around 12-13dB for a stable connection. I note Orcon and Vodafone both seem to allow a 5-6dB noise margin in an effort to get higher throughput, this will probably work with shorter lines, but not so well with long ones.

Tools such as DMT tools allow you to adjust the target S/N of your modem which in turn will effect throughput and reliability.



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1828 posts

Uber Geek
Inactive user

  #179536 23-Nov-2008 02:14
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thanks for that i'll give DMT tools ago and see how it works out cheers


1828 posts

Uber Geek
Inactive user

  #180572 27-Nov-2008 01:19
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well i found the version of dmt tools for the siemens speedstream but it wouldn't let me tinker with the SNR db and i couldn't find a version that would work with the Huawei mt882 so as nicer tool as it is it's pretty much useless to me but thanks anywho least you tried aya thats the main thing

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