This book includes: fundamentals of the technology: concepts and definitions; fundamentals of transmission systems: technology and applications; voice communications systems: KTS, PBX, centrex, and ACD; messaging systems: facsimile, voice processing, and electronic mail; public switched telephone network (PSTN); fundamentals of data communications; conventional digital and data networks; local area networks (LANs): connectivity and internetworking; broadband network infrastructure; broadband network services: frame relay, SMDS, ATM, GbE and 10GbE, B-ISDN, and AINs; wireless networking: emphasis on mobility; the internet and world wide web; video and multimedia networking; network convergence; regulation: issues and (some) answers.