ROGER L. FREEMAN is founder and Principal of Roger Freeman Associates, independent telecommunications consultants, specializing in system engineering in the United States, Canada, and Hispanic America. In the course of over forty-five years' experience in telecommunications operations, maintenance, and engineering, he has served as principal engineer for advanced system planning at the Raytheon Company, technical manager for ITT Marine Europe, and regional planning expert for the International Telecommunications Union (ITU), among other positions. In addition to the previous edition of Fundamentals of Telecommunications, Mr. Freeman has written six other books on the subject of telecommunications engineering: Reference Manual for Telecommunications Engineering, Third Edition; Fiber-Optic Systems for Telecommunications; Telecommunication System Engineering, Fourth Edition; Radio System Design for Telecommunications, Second Edition; Practical Data Communications, Second Edition; and Telecommunications Transmission Handbook, Fourth Edition, all published by Wiley. A senior life member of the IEEE, Roger Freeman has lectured at numerous professional conferences and published widely in international telecommunication journals.