This book provides an engineering description of the methods used to process and transmit broadband signals. As such, it includes both the analog and digital transmission of data and graphic information, as well as multiplexed voice transmission. The technological developments of the past decade have brought to the system designer a seeming wealth of possibilities for communications transmission. The selection of the best method for a given application, however, may be rendered difficult because much of the information is scattered among several texts and many different published papers. This text brings together in one volume a treatment of all broadband communication system types at a level readily understandable by the practicing engineer. It allows a detailed understanding and evaluation of each system type, and provides the information needed to structure special-purpose transmission systems. The material has been developed over a period of ten years, during which the author has been teaching a popular continuing engineering education course on Broadband Communication Systems several times per year. This course often is attended by recent engineering graduates who express the need for more information at the senior and graduate level on the engineering of transmission systems for high-speed data and video, as well as for multi-channel voice. Thus, the book has been written not only for the practicing engineer, but also to supplement more theoretical texts used in telecommunications engineering courses. Accordingly, problems are included at the ends of most of the chapters. Chief engineers and engineering managers also will find portions of the text useful in understanding the basic ideas and structure of broadband communication system for overall end-to-end system planning purposes. While the emphasis of the book is on broadband systems and technology, the principles are applicable generally to narrowband systems as well. Readers interested in speech coding techniques are referred to the book Digital Telephony and Network Integration, [Van Nostrand Reinhold Company, Inc.], co-authored with Eugene Strange. Such media as high-frequency radio are not included because of their limited bandwidth per channel. The term wideband is used by some to designate systems up to 1.5 or 2.0 Mb/s, with higher transmission rates being designated broadband. Others use the term broadband for any system whose bandwidth is in excess of voice bandwidth. This text uses the name broadband to encompass all systems operating at rates beyond those of voice systems, without further delineation..