COVER -- Contents -- PART ONE HARDWARE AND NETWORKS -- Introduction to On-Line Systems -- Basic Communications Theory -- Communication Lines -- Multiplexers, Statistical Multiplexers, Concentrators, and Front-End Processors -- Network Configurations -- Terminals and Personal Computers -- Modems and Interfaces -- Local Area Networks -- Digital PBX -- Error Detection -- Network Delays : Loop Delay -- PART TWO PROTOCOLS AND ARCHITECTURES -- Introduction to Network Protocols -- The International Standards Organization's Open System Interconnection -- Introduction to Line Protocols : Half-Duplex Point-to-Point -- Half-Duplex Multipoint -- Half-Duplex Performance Analysis : Examples -- Introduction to Full-Duplex Protocols -- Introduction to HDLC/SDLC (High-level Data LinkControl/Synchronous Data Link Control) -- HDLC Data Transfer -- HDLC Network Examples -- Network Design Summary -- PART THREE COMMON CARRIER NETWORKS -- Communications Carrier Facilities -- Digital Data Networks and ISDN -- Packet - Switching : CClTT Recommendation X.25 -- PART FOUR PLANNING AND MANAGEMENT -- System Planning Considerations -- Network Management -- PART FIVE QUEUING AND STATISTICAL CALCULATIONS -- Basic Statistics -- Introduction to Queuing Theory -- Index.