Date: Thr, 29 Jun 2000 16:15:24 -700
From: Walter Scott <[EMAIL PROTECTED]>
Subject: Re: Timeout Expired
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Ron:
Notice that I did NOT write you can't set a COM port and UART
speed higher than 19,200 up to and including 115,200 bps. What I did
write was that "you can configure for higher speeds (i.e. 38,400) and
Net-Tamer will seem to properly take control of your modem. However,
communication between your computer and your modem while online with
an ISP could be garbled."
I've owned and used quite a few modems since 1984 -- some of them
USRs. Among those manufactured by American companies, I've not
encountered ONE that had problems with ATZ. ATZ is a very basic
function to modems using a command set originally known as the "Hayes
compatible" command set. Any modem that can't properly handle it
without causing problems is defective or, where most modems in a
particular line malfunction when ATZ is used, must be the product of
outrageously incompetent design engineers or knock-off/copycat
manufacturers who never had in mind developing their own technology
rather than shabbily copying another manufacturer's technology. But
again, aside from some of the cheap and highly flawed knock-off modems
that came out of Taiwan in the mid and late 80s, I've not heard of or
encountered such problems.
Walter Scott
On 2000-06-29 [EMAIL PROTECTED] said to <[EMAIL PROTECTED]>
and the Net-Tamer List Group:
RCD> ><> XTs and their 8250 or 16450 UARTs will not allow port
RCD> >initialization speeds greater than 19,200 bps. That's to say
RCD> >you can configure for higher speeds (i.e. 38,400) and
RCD> >Net-Tamer will seem to properly take control of your modem.
RCD> >However, communication between your computer and your modem
RCD> >while online with an ISP could be garbled. This would or could
RCD> >explain the authentication error.
RCD>
RCD> With a 9600 bps modem 19200 should be fast enough, especially if
RCD> all you have for error control is MNP and all you have for
RCD> compression is MNP5. Frankly, I'd turn off compression in that
RCD> situation, anyway. It is not true that you can't initialize an
RCD> 8250 at 115200, but you're probably going to drop characters
RCD> between the port and the modem because of the fact that both the
RCD> 8250 and 16450 have just a 1-byte buffer and an XT can't service
RCD> the interrupt fast enough to keep up with that, probably not even
RCD> at 38400. [...]
RCD>
RCD> >Your modem may need time to clear registers and other settings
RCD> >as an ATZ is executed. Therefore, you may wish to use
RCD> >something like ATZ^M~~ATxxxxx where xxxxx represents the
RCD> >various other settings you'll have to include on your own in
RCD> >the modem initialization string.
RCD>
RCD> From what I've heard, ATZ can do strange things with USR modems,
RCD> but there are many different USR modems.
[[[[[ News & Views 24 Hours A Day, 7 Days A Week. That's The Net ]]]]]
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