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Unit 3 Telecommunications : Basics Information Technology: Concept and Basics UNIT 3 TELECOMMUNICATIONS : BASICS Structure 3.0 Objectives 3.1 Introduction 3.2 Basic Concepts and Terminology 3.2.1 Telecommunications: Definitions 3.3 Data Transmission 3.3.1 Analog Transmission 3.3.2 Digital Transmission 3.3.3 Frequency and Bandwidth 3.3.4 Message Quality and Quantity 3.4 Communication Channels 3.4.1 Synchronous and Asynchronous Transmission 3.4.2 Modems 3.5 Transmission Media 3.5.1 Twisted Pairs 3.5.2 Coaxial Cables 3.5.3 Optical Fibres 3.5.4 Microwave Transmission 3.5.5 Satellite Transmission 3.5.6 Choice of Medium 3.6 Switching Mechanisms 3.6.1 Circuit Switching 3.6.2 Message Switching 3.6.3 Packet Switching 3.7 Networking and Telecommunications 3.7.1 Networks 3.7.2 Types of Networking 3.7.3 Open Systems Interconnection (OSI) 3.8 Telecommunications Standards and Protocols 3.8.1 Standards 3.8.2 Protocols 3.9 Summary 3.10 Answers to Self Check Exercises 3.11 Key Words 3.12 References and Further Reading 3.0 OBJECTIVES After reading this Unit, you will be able to: • understand what telecommunications is all about and the features and characteristics it involves; • explain the basic, concepts and terminologies in telecommunications; • discuss the ways and methods as to how information is transmitted; • identify the specific telecommunications technologies and their current or potential applications in library and information activities; • examine information developments which are a direct result of the recent advances in telecommunications; and • acquire knowledge relating to some important standards that are helpful in the transmission process. 3.1 INTRODUCTION Telecommunications is an important area of Information Technology. The rapid developments in telecommunications over the past twenty years have been an 38 essential component in the growth of computer-based library and information systems and services. Telecommunication : Basics It would not have been possible to realise and implement systems and services like Videotex, Teletext, CATV, Electronic directory, Electronic mail, teleconferencing, document preparation and transfer, database handling, VANS/LANS, etc. without the aid of telecommunications. Also, the comparatively cheap and easy way by which large collections of bibliographic data on a variety of computer systems throughout the world can be passed on to or accessed from a terminal in a library or information centre would not have been, possible but for the rapid developments in telecommunications. Since all these aspects have become part of computer-based library and information systems and services, it is necessary that an information professional should have a basic knowledge of recent innovations in telecommunications which involve the use of novel transmission media, increased computer control of networks and specific provision for data communications. All these provide' faster, cheaper, and more reliable transmission of large amounts of data over both short and long distances. The integration of electronic mail services means that they can all be accessed from one terminal, either through the use of specific hardware such as telex or fax boards, or via 'protocol conversions. Similar type of integration is being seen with online search services also. This Unit is intended to provide telecommunications basics with the objective of imparting elementary knowledge of the subject to the participants of BLIS Programme. The Unit is intended to be a primer in this regard. 3.2 BASIC CONCEPTS AND TERMINOLOGY In order to understand specific telecommunications technologies and their current or potential applications, in libraries and information services, we need to understand basic concepts and terminology in telecommunications. It is assumed that the participants of BLIS programme of IGNOU have no prior knowledge of the subject. Hence, some of the elementary concepts and terminology are discussed in this section to provide them the necessary backdrop. 3.2.1 Telecommunications; Definitions `Data communications', `Communications technology', `Computer telecommunications', Compunications', `Telecomputing', etc., are just some of the terms we come across in our 'current literature on the subject. Most of these terms are used to describe a process, that of transmitting a message from one point to another by electronic means, and the devices used to achieve this process. The process is well known and we engage in this process daily as we speak to one another. We call this the communications process. Therefore, "Telecommunications may be defined as the transmission of representations of information between remote locations by electronic means. This information may be in the form of Voice, Video, or data generated by, a computer". (Kenney, 1981) When we use the telephone to talk with each other, we engage in a telecommunications process. We use the telephone instrument (which might be characterised as a terminal) to enter our message (data) for transmission to another point; at the destination, another terminal is used to receive our message and return one if needed. The two terminals are connected by an electronic communications channel 'or link, which serves to carry the message from point A to point B and back again. A telecommunication process, thus consists of data to be transmitted (our messages), devices called terminals to send and receive messages, and a communications channel (see the fig.). In ease many messages are being sent and received at any one time between many different points; switching mechanisms are needed to ensure that all messages arrive as quickly as possible, without bottle necks encountered along the way. For an easy understanding of this concept, we can compare this message traffic to city traffic, flowing in many directions and controlled by traffic lights which allow only a certain number of vehicles to move in a given direction at any one time. Telephone messages are similar to vehicles; both have definite 39 Information Technology: Concept and Basics points of origin and destination and we can think of the system of traffic lights as switching mechanisms, to permit vehicles to move as quickly as possible to their destination. We speak of traffic networks, and similarly, we speak of telecommunications networks. "A telecommunications network, at its simplest, may be regarded as comprising a transmission network, an arrangement of transmission paths and switching centres through which signals are conveyed by a physical transmission medium. Information coming from a source, or to a receiver, is converted via a terminal into signals appropriate to the characteristics of the particular network". (Bawden and Blakeman). For example, in the standard voice telephone network system, the changes in air pressure at the microphone are represented by a corresponding variation in electrical voltage. This is an example of an analogue signal. In contrast, computer systems generate digital signals, which are represented as one of two discrete states, namely on or off (1 or 0). Other sections of this Unit will be devoted for a brief description and discussion of the process of data transmission, communication channels, transmission media, switching mechanisms, terminals and networks - all of which form the basic components of telecommunications. Self Check Exercise l) Explain briefly the concept of “telecommunications” 2) Describe the functional components of a telecommunication network. Note: i) Write your answer in the space given below ii) Check your answer with the answers given at the end of this Unit. ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… 3.3 DATA TRANSMISSION When we talk on the telephone we generally transmit a message to someone else. The message is made up of words that we speak into the telephone instrument. The human voice causes sound to be formed into words; these sounds are transmitted in the form of acoustical wave patterns into the telephone instrument where they are translated into electronic wave patterns. These wave patterns are transmitted over a channel to their destination where they are converted back into sound waves received by the human ear. It may be mentioned that all electronic transmission takes place by means of wave patterns. There are two major patterns. They are analog and digital. 3.3.1 Analog Transmission In analog transmission, there is a continuous up and down pattern. For example, one wave constitutes one cycle, which is measured in the unit called Hertz (cycle per second), the terms cycle and hertz may be used inter-changeably. Thus, it is customary to describe channels as transmitting a certain number of cycles per second (cps). 3.3.2 Digital Transmission In digital transmission, wave patterns are translated into discrete bits and are separated by intervals. Bits (contraction for binary digits) are the smallest unit of information in data processing. They may be compared to a light-bulb, which is either on or off. When the bulb is on, information is being transmitted; when it is off, there is a blank or interval. In the figure, the upper line of the rectangular wave form 40 represents the bits. The lower line denotes the interval between bits. At this juncture, it must be noted that all electronic transmission Telecommunication : Basics can occur in either the analog or the digital mode. The telephone network, originally intended to carry only the human voice, operates mostly in
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