How to configure serial modem in linux

[Open Your Hands]

My modem work with windows properly, but in fedora 7 i couldn't find com port. in windows modem in com port 1. how can i find my com port in fedora linux

[Open Your Hands]

If you have this type of problem,

First check is modem configured properly. see below comports in linux OS.

IF com1: = Linux /dev/cua0 (and /dev/ttyS0)
IF com2: = Linux /dev/cua1 (and /dev/ttyS1)

You can check your IRQ settings in linux using this command;  #cat /proc/interrupts


 _{0:    6766283   timer
 1:      91545   keyboard
 2:          0   cascade
 4:     156944 + serial
 7:     101764   WD8013}

How to move your serial ports to non-standard IRQs

#/bin/setserial -b /dev/ttyS2 IRQ 11
#/bin/setserial -b /dev/ttyS3 IRQ 15

After that install your modem drivers. and connect to your ISP and enjoy.

[WTC]

I have an externel serial modem. It seems to be not working. Plz help. 

[Open Your Hands]

Check your external modems (14,400 Baud or above), your serial port needs to be capable of handling the throughput that such a modem is capable of producing, particularly when the modems are compressing the data.

This requires your serial port to use a modern UART (Universal Asynchronous Receiver Transmitter) such as a 16550(A). If you are using an old machine (or old serial card), it is quite possible that your serial port has only an 8250 UART, which will cause you considerable problems when used with a high speed modem.

Check with; #setserial -a /dev/ttySx

Check the results If you do not have a 16550A type UART fix the new serial card.