We focus on the design and implementation of integrated communication networks that enable users over a wide geographical area to communicate in a reliable and secured manner, no matter via voice, data, image, video, or a combination of all as multimedia. Different broadband technologies from ATM to Gigabit Ethernet, Optical Ethernet, DWDM, Frame Relay, xDSL, cable modem as well as wireless are employed for building and enhancing such large-scale networks for service providers.