Computer hardware; computer software for operating and/or managing computer networks, Ethernet switches, routers, and/or serial devices forming a network; computer software for operating and/or managing communication networks and networking infrastructure: computer software for detecting and recovering from a fault in a communication network; computer software for monitoring the performance and the physical structure of a computer network; computer software for managing and visualizing the performance of a computer network; computer software, namely, an embedded operating system for computers, managed Ethernet switches, routers and/or serial devices servers forming a network; computer software, namely, an operating system for computers, managed Ethernet switches, routers and/or serial device servers connected to a network; computer network communication routers, Ethernet switches and computer switches, gateway routers for use with communication networks, computers and modems; fiber optic cables, connectors and filters; fiber optical network and components therefor; fiber optical Ethernet networks and components therefor; fiber optical networks comprised of hubs, switches and fiber-to-electrical media converters, communication hubs, communication routers and switches having mixed fiber optical and electrical media ports; computer network hubs, switches and routers having fiber optical ports; computer hubs,routers and switches having mixed fiber optical and electrical media ports; fiber optical Ethernet networks comprised of hubs, switches, fiber-to-electrical media converters, serial to Ethernet servers, communication hubs, communication routers, computer hubs, computer network routers, switches and serial to Ethernet servers having mixed fiber optic to electrical media ports, and components therefor; computer network hubs, switches and routers having optical ports and components therefor; computer hubs, routers, switches, serial to Ethernet servers and serial device servers having mixed fiber optic and copper ports; video encoders; fiber optic to cable converters; fiber optical to electrical media converters; serial to Ethernet gateways; serial device servers