Hi
I have a test setup with 10 serialports on my Linux PC.
Two ports are the regular serial ports and 8 comes from an extension card called
Turbo 8COM I/O Adapter from ByteRunner (www.byterunner.com)
And I run test on 6 modems without problem.
To have more than 2 serial port s on a mother board, which is the strandard, is
not a question of mother board but a question of serial ports extension card.
You can create more ttySn device file using mknod /dev/ttysn c majornum minornum
(to know the majornum and minormum see the existing tty files).
But I think you should have at least 4 ttyS files (from ttyS0 to ttyS3).
About your modem hang up problem you can have hundred raisons.
If you have a Rockwell/Conexant/ chip set based modem, try to use S95=44.
This will give you several messages at the connection.
i.e. CARRIER 50000
PROTOCOL LAPM
COMPRESSION V42BIS
CONNECT 115200
If you can see the CARRIER message but not the other messages that probably
means the line quality to bad to handle a LAPM connection (ERROR CORRECTION).
If you run ppp connections you may have also a problem with the ppp
configuration.
Add debug in your /etc/ppp/option file and see what happen in the
/var/log/messages file.
Philippe
Rajiv Ghai <[EMAIL PROTECTED]> on 10/29/99 04:31:24 AM
To: [EMAIL PROTECTED]
cc: (bcc: Philippe Vivarelli/Intl/Conexant)
Subject: How many modems for ppp connection?
Hello Everyone,
I have two simple questions:
1. Can one connect more than four modems (internal/external)to a Linux Box
(without using serial port adaptor cards) if the motherboard has 6-8 slots
(ISA/PCI) and the standard 4 serial COM1 to 4 ports ie. Can one create
/dev/ttyS5 and /dev/ttyS6 using Linux and attach another two modems or is
there a hardware limitation. Related question : Does anyone know of a
motherboard that supports more than 4 serial ports.
2. Some of my modems on my Linux box get hosed everytime I dial-in and
quickly hang-up the connection. I tried putting an ATS13=1 in my
mgetty.config file like the Modem How To says but it does not work. Any
suggestions, other than changing the modem ?
Thanks and Regards
Rajiv
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