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1.4

Introduction

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

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1-1 DATA COMMUNICATIONS1-1 DATA COMMUNICATIONS

The term The term telecommunication ____________________telecommunication ____________________. . The word The word data ________________________________data ________________________________. . Data communicationsData communications is __________________________ is __________________________

HistorySimplified Block DiagramComponents and Data Flow

Topics discussed in this section:Topics discussed in this section:

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If you will be looking at the things you do inside and outside the home, where do you use or encounter Data Communications? ?

1.7

History

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History

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History

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Five components of data communication

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Simplified Block Diagram of Data Communication Network

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Simplified Block Diagram of Data Communication Network

Data Terminal Equipment Data Terminal Equipment –general term that describes –general term that describes the interface equipment used at the stations to adapt the the interface equipment used at the stations to adapt the digital signals __________________________________digital signals __________________________________

Data Communications Equipment Data Communications Equipment

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Data Transmission- Simplified Block Diagram of Data Communication Network

Parallel Data Transmission Parallel Data Transmission – also called parallel by bit – also called parallel by bit or serial by character.or serial by character.

Serial Data Transmission Serial Data Transmission – also called serial by bit.– also called serial by bit.

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Data flow (simplex, half-duplex, and full-duplex)

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Fundamental Characteristics of Data Communications System

1.1. DeliveryDelivery

2.2. AccuracyAccuracy

3.3. TimelinessTimeliness

4.4. JitterJitter

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1-2 NETWORKS1-2 NETWORKS

A A networknetwork is a set of devices (often referred to as is a set of devices (often referred to as nodesnodes) ) connected by communication connected by communication linkslinks. A node can be a . A node can be a computer, printer, or any other device capable of sending computer, printer, or any other device capable of sending and/or receiving data generated by other nodes on the and/or receiving data generated by other nodes on the network.network.

Network CriteriaPhysical StructuresNetwork ModelsCategories of NetworksInterconnection of Networks: Internetwork

Topics discussed in this section:Topics discussed in this section:

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Types of connections: point-to-point and multipoint

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Categories of topology

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A fully connected mesh topology (five devices)

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A star topology connecting four stations

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A bus topology connecting three stations

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A ring topology connecting six stations

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A hybrid topology: a star backbone with three bus networks

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