The book describes the main aspects and the basic principles that must be used by an Engineering Team for the Definition and Implementation of the Ground Segment of a Satellite Communication Network. In particular, the following topics are dealt with: main features of the Space Segment (Spacecraft) made up of the Satellite and its payload; main characteristics of the satellite orbits with LEO, MEO and GEO satellites; main features of Satellite Transmission Frequencies and future developments; main characteristics of the Satellite Coverages (Hemi, Zone and Multibeam); main features of the Ground Segment constituted by the Communication Hub (Hub Station), Telecommand, Telemetry and Control Stations (TT & C) and User Terminals (UT); characteristics of Satellite Access Systems with particular reference to TDM, MF TDMA and CDMA technologies and to the technological evolution towards DVB S2X systems; criteria for Sizing and Designing a Satellite connection based on quality and availability service criteria with the relevant Link and Intermodulation calculations; Design criteria for an Earth Station and a Satellite Network; Evolution of the Satellite Network towards 5G.