M580 ETHERNET X80 EMBEDDED SWITCH The Ethernet network option switch BMENOS0300 module is an economic alternative to the external Dual Ring Switches, for copper Ethernet communication within limited distance. Based on the rotary switches on the front panel, the application of the two device network ports could be configured intuitively as: RIO Ring, DIO Ring, or DIO Ports. BMENOS0300 may be utilized in the local main rack or remote drops, to communicate with the distributed I/O devices.