The PEX8S952 8 Port Native PCI Express RS232 Serial Adapter Card with 16950 UART allows you to turn a PCI Express slot into eight RS232 (DB9) serial connections using the included breakout cable.
The serial card is based on a native single chip design that allows you to harness the full capability of PCI Express(PCIe), providing optimum reliability and speed, and reducing the load applied to CPU by as much as 48% over conventional serial cards.
The RS232 Serial Adapter Card is compatible with a broad range of operating systems, including Windows, Linux, and MAC OS for easy integration into mixed environments.
This review is from: StarTech 8 Port Native PCI Express RS232 Serial Adapter Card with 16950 UART Model PEX8S952
Pros: Worked with Debian Lenny. It is necessary to append "8250.nr_uarts=10" (without quotes) to the Linux kernel command line (e.g., in /boot/grub/menu.lst or in /etc/default/grub) so that the kernel expects a high enough number of serial ports. 10 is chosen above assuming 2 built-in serial ports. I'm using mine in an HP ProLiant M110 G7.
Cons: In my system, the mapping from physical ports to /dev/ttyS* is as follows:
Other Thoughts: I haven't had it in use long enough to comment on reliability.
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