David Wei to Rick Collins
 >  -=> Quoting Rick Collins to David Wei <=-
 > 
 >  DC>> Is there any way to get a USR Sportster to recognize a busy
 >  DC>> signal, rather than waiting until it times out from no
 >  DC>> carrier detect?    D.C.
 > 
 >  DW>  Try AT&F...
 > 
 >  RC> That provides no flow control.  AT&F1 on a USR is the default for
 >  RC> hardware flow control.
 > 
 >  Well, it seems that AT&F is the most commonly used setting... just a
 >  try... :)
Use just AT&F1, for hardware flow control, and perhaps add
whatever modifiers you want.  Xn deals with busy signal 
detection.  Here I tend to run with AT&F1S7=25 and the 
default Xn is X7, which does just about everything including
busy signal detection.
Folks who give out modem strings specify AT&Fblahblahblah 
for USR modems.  The blahblahblah is a great honking string
that modifies the thing back to simply AT&F1.
The odd reason why they do that is because whoever does that
is in the business of putting out strings for zillions of 
modems.  Most modems' strings use AT&F for default hardware
flow control, so for each they start with that and add a few
modifiers for their application program.  When they come to
do the USR modems' init strings, they start with AT&F by
rote and laboriously add modifiers to make it do what they
want...
That's why in the same circumstance USR, who deal only with
USR modems, says to start with AT&F1, which is definitive.
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