Table of Contents
INTRODUCTION 4
Activity 1 4
COMMUNICATION CONCEPTS 6
Serial and parallel transmission 6
Activity 2 6
Simplex, Half Duplex and Full Duplex Transmission 7
Activity 3 7
Synchronous and Asynchronous Transmission 8
Activity 4 8
MEASUREMENTS OF SPEED 9
Activity 5 9
Comparison of Data Transfer Speeds for Text 10
Activity 6 10
Calculating Speed 11
Activity 7 11
Activity 8 12
HARDWARE IN TRANSMITTING AND RECEIVING 14
Communication Within the Computer (the System or Internal Bus) 14
Activity 9 14
Communication with External Devices (External Buses) 15
Activity 10 15
Activity 11 16
Activity 12 17
The Role of Modems 18
Activity 13 18
Activity 14 19
Local Area Networks (LANs) 20
Activity 15 20
Wide Area Networks (WANs) 23
Activity 15 23
SOFTWARE FOR TRANSMITTING AND RECEIVING 24
Software that Interfaces with Hardware 24
Activity 16 24
Software for Transferring Text, Numeric, Image, Audio and Video 25
Activity 17 25
NON-COMPUTER TOOLS FOR TRANSMITTING AND RECEIVING 26
Activity 18 27
SOCIAL AND ETHICAL ISSUES ASSOCIATED WITH TRANSMITTING AND RECEIVING 28
Quality of Information Received from the Internet 28
Activity 19 28
Security of Data Being Transferred 30
Activity 20 30
Net-Etiquette 32
Activity 21 32
Global Issues – Time Zones, Date Fields, Exchange Rates, Foreign Languages 33
Activity 22 33
Changing Nature of Work for Participants – Working from Home or Telecommuting 34
Activity 23 34
Current and Future trends in Digital Communication 41
Activity 24 41

INTRODUCTION

The transmitting and receiving information process transfers information and data within and between information systems. This transfer of data occurs between components within a single computer, such as the transfer of data between RAM and the CPU. It occurs whenever peripheral devices are used, such as keyboards, printers and modems. It also occurs between computers when communicating using local area networks and wide area networks such as the Internet.
Activity 1

Complete the following:

Transmitting and receiving is the process that transfers information / data within and between hardware. Within a computer system, data is transmitted and received among the various parts of the system. This makes maximum use of transmission speeds because the data is in digital form. Digital signals use on off electrical pulses, and this kind of signal works well in representing two-state binary code, the 0s and 1s used by computers.

In order to transmit and receive between computer systems, it is necessary to have a link between the computers. Such a link creates what is referred to as a transmission. Not all the connections on a network are continuous. Many of our traditional means of transmitting data electronically are analog. Analog data is represented as a continuous wave rather than the discrete signals used for digital transmission. This results in a need to convert signals from one form to another when using certain types of hardware. This, and the type of link used, will affect the speed of transmission.

Transmitting and receiving can be carried out in many different ways: computer networks, analog phone networks, mobile digital phone networks, papers, facsimiles, the internet and a range of traditional method from signals to letter and parcel mail.

Word list binary code, continuous, digital, hardware, maximum, network, on and off, speed, system, transfers, transmission

COMMUNICATION CONCEPTS
Serial and parallel transmission

Data can be sent as serial or parallel transmission. Both types are used in sending and receiving data. Complete the table comparing the two types of transmission.
Activity 2

Type
Description
Diagram / Picture
Advantages and Disadvantages
Examples of use
Serial transmission
Data bits flow along a single connecting link or wire one after the other. To send one byte of data each of the eight bits is sent separately one after the other.

Can travel long distances using only 2 wires