A critical appraisal of broadband systems for high-speed Internet systems. It offers a demystifying overview of existing and future mobile and fixed systems that use gigahertz or terahertz frequencies, and serves as a reference for information on most high-speed Internet systems that are currently in use or that will come into use before 2015. Making extensive use of photographs of actual systems, diagrams, and graphs depicting market developments and important system characteristics, the book supplies real-world information provided by commercial sources that helps the reader understand the realm of broadband carriers and their technologies. It also explains how these technologies interact using digital signalling in gigahertz and terahertz frequencies.