Add 4 RS-232 serial ports to your standard or small form factor computer through a PCI Express expansion slot. 4 high-speed RS-232 serial ports with support for data transfer rates up to 128,000 bit/s Highlights: - 256-byte deep FIFO per transmitter and receiver - Native single-chip, single-lane PCI Express - Includes low-profile/half-height mounting brackets - Built-in 16C450/550-compatible UART - Compliant with PCI Express Base Specification 1.1