Date: Thu, 29 Jun 2000 09:40:38 +0700
From: "Ronald C.Dailey" <[EMAIL PROTECTED]>
Subject: Re: Timeout Expired
On 2000-06-29 [EMAIL PROTECTED] said:
>Date: Thr, 29 Jun 2000 08:49:40 -700
>MIME version: 1.0
>Content-transfer-encoding: 8bit
>--tcpsmtp060290200007021006
>Jerry:
>There may be more going on than your modem settings. Here
>are some basic thoughts that may or may not help.
><> XTs and their 8250 or 16450 UARTs will not allow port
>initialization speeds greater than 19,200 bps. That's to say
>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. This would or could
>explain the authentication error.
With a 9600 bps modem 19200 should be fast enough, especially if all you
have for error control is MNP and all you have for compression is MNP5.
Frankly, I'd turn off compression in that situation, anyway. It is not
true that you can't initialize an 8250 at 115200, but you're probably
going to drop characters between the port and the modem because of the
fact that both the 8250 and 16450 have just a 1-byte buffer and an XT
can't service the interrupt fast enough to keep up with that, probably
not even at 38400. Anyway, the port rate is a consideration and
probably shouldn't be set higher than 19200.
A possible way to solve this would be to find an ISA serial card with a
16550AF UART on board. This could be plugged into the bus in the XT and
allow higher port rates, maybe even higher than those modems could
handle.
><> You may need to experiment with your modem settings for level
>of MNP and whether compression is turned on or off. You might
>benefit from giving your ISP a voice call to their help desk
>or tech support to ask what level of MNP their modems use and
>whether they require that compression be turned on or off by
>you when you call in.
That's why we need to know if these modems even have V.32 let alone MNP.
They probably have MNP, but they may just be HST modems, and that would
limit the connect rate to 2400 unless the ISP can do HST at its end
(which isn't likely).
>initialization string with "ATZ^M" (don't leave out the "^M"!)
>Your modem may need time to clear registers and other settings
>as an ATZ is executed. Therefore, you may wish to use
>something like ATZ^M~~ATxxxxx where xxxxx represents the
>various other settings you'll have to include on your own in
>the modem initialization string.
>From what I've heard, ATZ can do strange things with USR modems, but
there are many different USR modems.
><> You may have a dirty phone line. That's to say there is a lot
>of electronic noise introduced because of a number of factors
>I will not address here. The higher your connect speed, the
>more sensitive your modem shall be to such noise on a phone
>line. You may not have noticed the problem with your 2,400 bps
>modem whereas it's showing up now with a faster modem. If MNP
>and compression are turned on, the modem may be spending so
>much time attempting to correct for noise that Net-Tamer can't
>get in edgewise to execute its login script. Ergo, you
>encounter a timeout from your ISP.
USR modems were pretty good with dirty lines, especially the old HST
models. Even a 14.4 V.32bis modem could do okay on a dirty line, but
might fall back to 9600 or lower on a bad connection.
Ronald Dailey
--
RCD
Net-Tamer V 1.12.0 - Registered
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