Roger L. Freeman is founder and principal of Roger Freeman Associates, independent consultants in telecommunications, specializing in system engineering in Hispanic America. In the course of over 45 years of experience in telecommunications operations, maintenance, and engineering, he has served as principal engineer for advanced system planning at Raytheon Company, technical manager of ITT Marine, Europe, and regional planning expert for the International Telecommunications Union (ITU). Mr. Freeman is the author of Reference Manual for Telecommunications Engineering, Second Edition; Radio System Design for Telecommunications, Second Edition; Practical Data Communications; and Telecommunication System Engineering, Third Edition -all published by Wiley.