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The RB2011 is a low cost multi port device series. Designed for indoor use, and available in many different cases, with a multitude of options.
RouterBOARD 2011UiAS-RM, in comparison with RB2011L series, not only has five Gigabit LAN ports and five Fast Ethernet LAN ports, but also has RJ45 serial port, USB port and more RAM (128MB instead of 64MB).