Large number of ports The RB493G is equipped with nine gigabit Ethernet ports, three miniPCI slots and two switching systems, thanks to which the Ethernet ports can be combined into two switch groups to ensure link capacity. The device also offers a USB 2.0 port and a micro-SD card slot for increasing the amount of mass storage or a USB 3G modem for a backup connection. High performance MikroTik RB493G RouterBoard is equipped with a powerful Atheros AR7161 processor, offering 256 MB of built-in RAM, and RouterOS turns this powerful system into a highly advanced router, firewall or bandwidth manager.