Bicephale
join:2005-09-24
 ·TekSavvy Solutions..
1 edit | reply to BobTheVeg
Re: Need help/tips about DSL connection speed
Hi,
There's still a problem with the UpStream SNR Margin
so it would be hard to convince your ISP to ask Bell
for a profile raise, in my own opinion! If the decision
were mine, i know i'd have a hard time trying to put
in the balance the fact that you're on "Interleaved"
mode vs your relatively stronger DownStream signal.
The areas coloured in purple are those you must focus
for the time being, while the ones in red shall guide
you toward the goal to attain... 1st of all, call the
ISP and request that they capture the statistics from
Bell's "Line Test" portal in order to know what your
RCO numbers are with and without tweaks, additionally
to the attenuation levels. The other numbers coming
from the ISP's end would be nice to see as well. As
for the tweaking itself, once you have done this you
will find that there's no easy way to accomplish this:
it's a slow process during which you must try to learn
what value ranges are acceptable. Ideally, this must
be done one parameter at a time and then you can try
combinations later... For example, it's probable the
MoDem won't connect if you change all the numbers at
once using extreme values; lower 1 parameter slightly
(in steps) each time until you reach a limit beyond
which issues occur. Keep in mind that this limit may
very well move while other parameters are optimized,
meaning you better revisit previous limits when some
progress is made and then back off a bit to remain in
the stable operating range. The objective is to give
away some transmission power and hence related noise:
watch the UpStream "Tx Pwr" (Transmition Power) level
in hope that a few less dBm will translate as a few
more dB, with the UpStream SNR Margin but possibly
also the DownStream SNR Margin since less local noise
should leave more room for the DownStream signal too.
Euh... I made an error about the RCO in this graphic:
you should read "Enter Maximum Theoretical Speed based
on RCO"!... It may equally tell us what's a viable target.
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