Telecommunications and the data processing network have interconnected the world, enabling people to communicate easily even across long distances. A clear example of this is the Internet – it is a complex network of local, metropolitan and wide area networks (using either wired or wireless Ethernet) built upon frame-based computer networking technologies.
At the physical layer, most wired Ethernet implementations use copper twisted-pair cables. More recent implementations (especially high-speed ones) use fiber optics. At the interface between these optical and electrical networks, glass-to-metal sealed hybrid or microelectronic packages, high-frequency Transistor Outlines (TO PLUS®) and ceramic-to-metal sealed (SCHOTT CerTMS®) packaging components are equipped with windows and lenses to meet complex connection demands for high speed data processing, supporting data rates of up to 40 Gbits⁄s.