News Group Posts

PPP at 57600

Before high speed internet, we were stuck with expensive T1's or slo-o-o-w modems. A 56K network was a heck of a lot better than a 38.4!

For quite a few years, my High Speed Modems for SCO Unix (and other modem tips) was the most popular page here by far - I doubt it gets any hits at all now other than from search engines.

From: "Brian K. White" <linut@squonk.net>
Newsgroups: comp.unix.sco.misc
Subject: Re: GETTY with fast modems SCO 5.0.5
Date: Tue, 16 Nov 1999 08:31:36 -0500
Message-ID: <38315CB8.DE709EB5@squonk.net> 
Cache-Post-Path: firth.squonk.net!unknown@dialup-102.squonk.net

Global Fusion wrote:
> 
> Anyone been able to get getty to run at 38K or faster?
> My SCO 505 returns getty bad speed errors and getty respawns,
> even though the modems connect OK.

I have both incoming getty and outgoing ppp working at 57600 between
computer & modem, and as high as the modem is capable of at any given
moment between modem & modem, on sco 5.0.5

Here is how I'm getting it, this is not the be-all end-all, and I don't
actually know as much as I'd like about how it all works, it's just
working great here for a fact and back when I first got the system I had
the same exact question as you just asked and I lived without for a
couple months because the sco on-line docs are a little hard to figure
out at first how to get what you want/need out of them, though they are
pretty complete. So, Here...

This is for a 33.6 modem on COM1
other ports (like a digiboard) would not only require different entries
in the files, but in at least one case, different files to edit
altogether. In some cases I show the whole file, so as to avoid you
making duplicate entries in files by simply adding what you see here to
the end, but in some cases I only show the lines that should be added,
if the file is large and I'm sure you don't already have a line that
would conflict. It should be apparent which is which when you open your
existing fils in an editor. Don't make any assumptions about the
importance of whitespace. Trailing spaces on the ends of lines are
sometimes bad, cutting & pasting sometimes fills the whole line with
spaces so watch it. newlines may not be unimportant between lines, leave
them if they are shown here. sometimes the order in which lines appear
is important. basically don't assume *anything* :)
on top of all that, be aware that some lines are supposed to be much
longer than 74 characters, and the text in email almost always gets
wrapped somewhere between 70 and 80. I'll try and explain later the
important bits of the interactions between the files so you can sense
what you can and should change and what you should not. 

/etc/conf/init.d/sio:
------
Se1a:234:off:/etc/getty tty1a m
Se2a:234:off:/etc/getty tty2a m
Se2A:234:off:/etc/getty -t60 tty2A 3
Se1A:234:respawn:/etc/getty -t60 tt1A 5M
------

/etc/inittab:
------
Se1a:234:off:/etc/getty tty1a m
Se2a:234:off:/etc/getty tty2a m
Se2A:234:off:/etc/getty -t60 tty2A 3
Se1A:234:respawn:/etc/getty -t60 tt1A 5M
------

/etc/gettydefs:
------

#
# M1-M5: dialin on Multitech 33.6 modem
#

1M # B2400 HUPCL # B2400 CS8 SANE HUPCL TAB3 ECHOE CTSFLOW -ORTSFL
#\r\n(2400)login: # 1M

2M # B9600 HUPCL # B9600 CS8 SANE HUPCL TAB3 ECHOE CTSFLOW -ORTSFL
#\r\n(9600)login: # 2M

3M # B19200 HUPCL # B19200 CS8 SANE HUPCL TAB3 ECHOE CTSFLOW -ORTSFL
#\r\n(19200)login: # 3M

4M # B38400 HUPCL # B38400 CS8 SANE HUPCL TAB3 ECHOE CTSFLOW -ORTSFL
#\r\n(38400)login: # 4M

5M # B57600 HUPCL # B57600 CS8 SANE HUPCL TAB3 ECHOE CTSFLOW -ORTSFL
#\r\n(57600)login: # 5M

------

/usr/lib/uucp/Devices: (remove or comment any other lines that talk
about tty1A. particularly, the first line shown heremust be the first
non-comment line in the file that has tty1A in it)
------
ACU tty1A - 57600 MultiModem_MT2834ZDXb
Direct tty1a - 57600 direct
------

/usr/lib/uucp/default/MultiModem_MT2834ZDXb
------
MDM_SETUP=AT&F&E1Q2&D3X0
MDM_SPEAKER=ATM0
MDM_DIALCMD=ATDTW
MDM_HANGUP=ATH
MDM_DIALIN=ATS0=1
------

And lastly there needs to be a symlink from
/usr/lib/uucp/MultiModem_MT2834ZDXb to
/usr/lib/uucp/default/MultiModem_MT2834ZDXb

for outgoing ppp to an ISP add:

/etc/ppphosts:
------
0.0.0.0:0.0.0.0 attach=SquonkNet uucp=SquonkNet conf=10 flow=rtscts
debug=0 mask=255.255.255.0
------

/usr/lib/uucp/Systems: (don't have to remove or comment the other line
you may have here)
------
SquonkNet Any ACU 57600 2921145 host: ppp login: myusername Password:
mypassword
modem Never Direct 57600 - - -
------


if you are installing on COM2, change all references to tty1A and tty1a
to tty2A and tty2a

if you are installing on a digiboard, then instead of
/etc/conf/init.d/sio you'd edit /etc/conf/init.d/epca, as well as change
use some other tty besides tty1A

the "5M" used in /etc/conf/init.d/sio and /etc/inittab corresponds to
the "5M" from /etc/gettydefs

all instances of "MultiModem_MT2834ZDXb" can be replaced with anything
else listed in /usr/lib/uucp/default, or you could copy one of those
files to a new name and edit it to suit. legal parameters for these
files are shown in "man atdialer"
the desired state you want the modem to be in , which determines what
you need to look-up in your modems manual, is:
Terse, verbale result codes ATV1 = verbal  ATX0 = just say "CONNECT"
don't say "CONNECT 31200 LAPM"
reste modem if dtr drops (AT&D2)
don't echo commands (ATE0)

if you need to type AT commands into your modem to set it up initailly
and then store the defaults with AT&W0, you can do so after making the
above changes by typing "cu modem" to get out of "cu" type "~." (no
quotes) and then [return]

You might also need to adjust some tunable kernel parameters using
"configure" such as TTYHOG and NCLIST if you get a lot of errors on the
connection. see "man configure"

all cases of 57600 can be replaced with higher or lower numbers, so long
as they all match

all cases of SquonkNet would be replace with whatever you feel like
calling your ISP

you connect to the isp by typing "pppattach SquonkNet" and waiting until
"ifconfig ppp0" shows that the connection is up.

in this line from /usr/lib/uucp/Systems:
SquonkNet Any ACU 57600 2921145 host: ppp login: myusername Password:
mypassword

everything after the phone number (2921145) is a simple expect-->send
chat script
wait for     "host:"
respond with "ppp"
wait for     "login:"
respond with "myusername"
waite for    "Password:"
respond with "mypassword"

and obviously would need to be tailored for your isp.

I *think* that's most everything necessary to get started.
this is distilled from my having visited and interpreted
/Unixart/quickppp.html for the most part along
with other documents on Tony's site and of course the sco on-line docs
--
Brian~

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