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echo: aust_modem
to: Bill Grimsley
from: Ludi Desouza
date: 1996-08-11 11:27:48
subject: LateLine Connection Stat

BG> So calling Trev's Viper with your Supra results in 
 BG> a 3429 symbol rate connect, but until Trev puts a 
 BG> Courier on line, there's still no hard evidence 
 BG> that the problem is USR's.  Perhaps it's something 
 BG> to do with the fact that whilst the Courier used to 
 BG> be overly aggressive with its initial link rate, 
 BG> USR appear to have done a minor about-face, and 
 BG> they now tend to connect a tad lower, then speed-
 BG> shift upwards if conditions permit?
 
Actually I would I though you knew more about this problem.  It surprises
me that you and others here are so quick to rubbish others on what is a
genuine documented 'problem'.  Here is part of some email about it
posted on comp.dcom.modems from Dan Moore at Supra to someone at USR:

**************************************************************** 
    USR chooses the 3200 symbol rate when answering a call from a modem
that doesn't support the 2743 symbol rate and that indicates the same
maximum projected data rate for both the 3200 and 3429 symbol rates.  This
does not match what some other V.34 implementations do.  By choosing the
3200 symbol rate instead of the 3429 symbol rate they are giving up about
2dB of SNR.  
 
...
 
    As I stated in my last email I suspect USR chooses the 3200 symbol rate
in order to avoid problems with very old Rockwell products.  This problem
was fixed well over a year ago.  I can't blame USR for making the choice
they did since there are a lot of modems that still have the problem.
***************************************************************
 
Ludi,
root{at}maxdog.apana.org.au

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