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Sending faxes through the PCI-RAS multi-modem card results in scattered text.
Serial card driver support for the PCI-RAS modem card is already included as part of the current
standard linux kernel 2.2.18 and above. The PCI-RAS multi-modem card is auto-detected and each
modem port is assigned a tty device name starting with ttySx as an extension of the standard COM
ports in your system. For example, ttyS3, ttyS4, ttyS5, ttyS6, and so on... Note that S is in upper case.
Known problem and solution
Problem: scattered text when sending faxes
Solution: Change the UART type from 16654 to 16650A using the "setserial" command.
Instructions: View the /var/log/messages file and take note of "port address" and the "IRQ" for each
serial port of the PCI-Fast card.
For example, suppose we wish to to use the first modem port for faxing and it was assigned a tty device name of ttyS4 and a port address of 0x2400 and irq 11. Based on this information, you would enter the following setserial command on the command line or add to a boot file on your Linux Server.
setserial /dev/ttyS4 uart 16550A port 0x2400 irq 11 baud_base 460800 spd_normal skip_test
Note: Each modem port will be assigned a different tty device name, port address and irq, therefore,
you will require a setserial entry for each modem port of the PCI-RAS multi-modem card. It is advisable to enter all the setserial entries into the 'rc.local' file in /etc/rc.d directory so that they are executed on boot up.