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000080_news@columbia.edu _Mon Sep 6 20:20:37 1999.msg
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From: John Pezzano <jpezz@earthlink.net>
Subject: Re: modem "messed up" after using C-Kermit on HP-UX
Date: Mon, 06 Sep 1999 17:53:47 -0400
Organization: Not Organized
Message-ID: <37D437EB.F0F4406A@earthlink.net>
To: kermit.misc@columbia.edu
Frank da Cruz wrote:
>
> In article <29Yz3.269$_h3.6386@client>, Ye Huang <ye.huang@zweig.com> wrote:
> : Another thing of using C-Kermit on HP-UX 10.20 to send a file via a
> : modem is that, I can no longer dial into the same modem attatched to the HP
> : machine (prompt characters are "messed up") unless I power cycle the modem.
> :
> : What needs to be set (or OS patched) to fix it?
> :
> This is more of an HP-UX system administration question than a question about
> Kermit. When a serial port is to be used for both dialout and dialin, the
> process that controls port when it is not being used for dialout (such as
> getty) has to "take back" the modem and reconfigure it for answering calls.
> Some modem configuration might also be involved -- for example, setting its
> profile to reload a call-answering configuration from NVRAM whenever a
> connection is dropped and/or setting some DIP switches in a certain way,
> depending on the make and model of the modem.
>
> Let's see if we can get some specific answers from HP-UX system adminstrators.
>
> - Frank
Some modems to be "smart" remember the last callout speed by autosyncing
to the "AT" command. They then use this speed when you dial in. getty
does not send an AT command so the modem will not sync to the getty. The
best way to handle modems on HP-UX is to:
Use only one speed to dial out. Modems in this day and age will sync to
the modem at the other end (unlike the old days of wooden ships and iron
men and modems that were dumb). There is no reason to use multiple
speeds.
Use the dialout speed as the getty speed. For the same reason as above,
let the modems handle the speed differences.
Use the fastest speed possible. If you have a port that supports 115K
and a modem that does, use it. If you have an old type card that
supports only 19.2K, then make that the speed you use.