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1. INTRODUCTION TO CONNECTIVITY
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This book explains two aspects of communicating through a business communications system:
• Part I, Communications System Networking, explains how to arrange two or more communications
systems in a network so that they communicate with each other efficiently and cost effectively.
• Part II, Data Connectivity, describes the flow of data both within and between communications systems.
This chapter explains some fundamentals that are common to both networking and data connectivity.
These fundamentals are:
• Transmission types
• Transmission states
• Multiplexed communication
• Trunking
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