"Nicolai Gersbo Sølling" <nicolai@ingenspam*gersbo-solling.dk> wrote in
message news:4027cd0b$0$1600$edfadb0f@dread14.news.tele.dk ...
The default factory initialization should be sufficient (and is usually
recommended) in just about every case.
Most problems with obtaining higher modem link speeds has to do with the
quality of the line rather than the init string. One key ingredient I recall
is when the POTS line gets converted between analog and digital on its way
to the CO and onward to its ultimate destination. When my area was
undergoing an "upgrade" many years ago, this wreaked havoc on my modem banks
due to the high number of conversions; each conversion would cause higher
noise levels as the digital tried to accommodate the analog.
Use the AT&$ command to get a list of the AT commands on the USR modem.
(There is also AT$, ATD$ and ATS$ for additional help commands.)
You could try playing around with the AT&U setting to adjust the minimum
link rate, but expect more failed connects if the link rate cannot be
achieved.
I don't know if it is still valid information, but I recall from my previous
life that a modem's link speed would not negotiate any higher than the COM
port's speed. Try adjusting the COM port's baud rate to the maximum, connect
with a terminal emulator, do an ATZ followed by an ATW. This will write the
COM port speed to the configuration loaded by default. It might make a
difference.
I don't know if Guard Tones are required in your area (see AT&G), but it is
worth looking into.
That's about all I can offer on the subject. Tweaking modems for a given
environment is really more of a hands on type of task.
Best of luck.
