ClassicBoard, PCI (5V), 4 RS-232 serial ports, DB-9, DB-25 or RJ45 connectors, Supports speeds up to 460.8 Kbps, 32-bit PCI slot, Full-duplex operation, Multi-strike surge suppression on every signal, 16C654 UARTs providing automatic flow control and 64-byte FIFO, Supports auto configuration of all PCI interrupts