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Preface. Acknowledgements. Communications in a Modern Society. Basic Telegraph and Telephone Operations. Basic Circuit Parameters, Measurement Units and Media Overview. Fundamental Data Transmission Concepts. Terminals, Workstations and WAN and LAN Networking Overview. Representative Standards Organizations: the OSI Reference Model. The Physical Layer, Cables, Connectors, Plugs and Jacks. Basic Transmission Devices: Line Drivers, Modems, and Service Units. Regulators and Carriers. Transmission Errors: Causes, Measurements and Correction Methods. The WAN Data Link Layer. Increasing WAN Line Utilization. Local Area Networks. Basic LAN Internetworking. Digital Transmission Systems and Equipment. Network Architecture. Packet Networks. Communications Software. Fiber-Optic, Satellite and Wireless Terrestrial Communications. Evolving Technologies. Index.