The RB493 has nine ethernet ports and three miniPCI slots, it also has a switch chip, so the ethernet ports of your choice can be grouped together to make it act as a switch. RB493 includes RouterOS - the operating system, which will turn this powerful system into a highly sophisticated router, firewall or bandwidth manager. With nine Ethernet ports, and three miniPCI slots, this is our most versatile RouterBOARD model. RouterBOARD 493 with Atheros 300Mhz CPU, 64MB RAM, nine LAN, three MiniPCI, NAND Storage with RouterOS Level 4 (Wireless AP support).