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1、Advanced Communication Systems 现代通信系统(双语),Prof.LIU Jiakang 刘家康 教授Beijing Institute of Technology 北京理工大学2008.9.,Course Brief 课程概要,Course Name:Advanced Communication Systems 课程名称：现代通信系统This is a discipline course for the final-year student in Information Engineering major.这是信息工程专业大四学生的一门专业课。This cours
2、e will be taught in bilingual.All teaching materials,including lecture notes,homeworks,experiment,examination,will only in English.本课程是双语教学，所有教学材料(包括课件、作业、实验、考试)均用英语。,Course Purpose课程目标,To introduce the telecommunication technology介绍通信技术To cover the history of Telecommunication覆盖通信历史To explain the p
3、rinciple of data transmission 解释数据信号传输原理To illustrate how communication networks are designed 解释通信网络是如何设计的To describe the trend for network convergence 描述网络融合的趋势,Textbook 教材,Textbook:Tamara Dean,Guide to Telecommunication Technology,CENGAGE(previously Thomson Learning)2003,ISBN 0-619-03547-1 远程通信技术,
4、清华大学出版社影印版，2003年,758页,78元,ISBN 7-302-07266-3Website:Extensive Review Questions,hands-on Activities,and Case Projects in each chapter.每章后有丰富的复习思考题和实验项目。,References 参考书,Fundamentals of Telecommunications,Wiley,1999G.Kennedy,B.Davis,Electronic Communication Systems,McGraw-Hill,1993Ray Blake,Electronic
5、Communication Systems(2nd ed)电子工业出版社，2002年Wayne Tomasi,Electronic Communications Systems(4th ed)电子工业出版社，2002年,Course Evaluation 课程结业方式,75%Final Close-book Exam 期末闭卷考试25%Homework,Experiment,Attendance 平时作业、实验、出勤率All work should be written in ENGLISH.所有的作业和考试必须使用英文书写提交。Homework and Experiment report s
6、hould be handed in on the Course website 作业和实验必须提交到指定的网站。,Course Website 课程的网站,Website:http:/How to log in:Username is your student ID No.Password is initialized to your class number(such as 01510400)Find the course“现代通信系统”on the site.All 60 students have been registered in the course.You should be
7、able to see the course.,Telecommunications Overview,Chapter 1,Advanced Communication Systems 现代通信系统(双语),Objectives,In this chapter,you will learn to:Define communication and telecommunicationIllustrate components of a communication systemUnderstand the difference between voice,video,and data telecom
8、municationsDescribe how telecommunication is used in a variety of industriesIdentify careers available to telecommunications professionalsIdentify the organizations responsible for establishing significant telecommunications standards and policies,Section 1.1 What is communication?什么是通信？,The Romans
9、used the Latin word communicare when they meant to make common,to share,or to impart.”Definition of CommunicationCommunication is the sharing of information or messages between two or more entities.通信的定义通信是指两个或多个实体之间共享信息的过程。,Elements of a Communication System通信系统基本组成,SIX elements:共有六个部分Source-the or
10、iginator of the message,whether it is a person or machine.信源Transmitter-the equipment that modifies the message(either data or voice)into the form required for transmission.发射机Communications channel-the means of carrying the signal from the source to the destination.信道,Elements of a Communication Sy
11、stem(cont.),Transmission media-may be physical,like a copper wire or fiber optic cable,or atmospheric,like radio waves.传输介质Receiver-is the device that captures the message from the communications channel and converts it into a form that the person or machine at the destination can understand.接收机Dest
12、ination-the person or machine to whom the message is directed 目的端,Elements of a Communication System Diagram,Flow of Messages信息的流向（工作方式）,Simplex-the type of communication in which messages flow in only one direction,from source to destination.单工Half-duplex communication-occurs when messages travel i
13、n both directions between the source and the destination,but in only one direction at a time.半双工Full-duplex communication-messages can travel over the communications channel in both directions simultaneously.全双工,Flow of Messages,Relative Number of Sources and Destinations收发端相对数量（通信方式）,One-to-one com
14、munication-a single source sends information to a single destination.一对一通信One-to-many communication-a single source simultaneously sends information to multiple destinations.一对多通信Many-to-many communication-occurs when many sources issue messages to many destinations.多对多通信,Relative Number of Sources
15、and Destinations,Quick Quiz,Listen to my question carefully.1.True of False2.Fill in the blank3.Fill in the blank4.Fill in the blank,Section 1.2 What is Telecommunication?什么是电信？,Communication that spans a distance.Voice telecommunication-using electrical signals to transmit human voice across a dist
16、ance,such as telephones and radio broadcasts.Video telecommunication-the electrically-based transmission of moving pictures and sound across a distance.Data telecommunication-the use of electrical signals to exchange encoded information between computerized devices across a distance.,What is Telecom
17、munication?,Quick Quiz,Listen to my question carefully.1.Fill in the blank2.Fill in the blank3.Fill in the blank,Voice,The telephony infrastructure includes cross-continental fiber optic cable to facilitate international voice telecommunications and national and regional cabling to connect long dist
18、ance calls.It includes numerous local,regional,and national switching centers where phone calls are routed to their destinations by computerized telephone switches.It also includes local connections(up to three miles in length)to residences(住地)and businesses capable of greater connection speed and v
19、olume than ever before.Finally,it includes the sophisticated telephone equipment and applications that users rely on.,Section 1.3 Modern Telecommunication Systems Data,Telegraph-one of the first data telecommunications inventions,uses wire to convey(传送)electrical pulses that represent letters or num
20、bers over a distance.Newer data telecommunications technology is not only faster,but also ensures better accuracy due to more reliable transmission media and techniques that enable the receiver to monitor the integrity of the data it has received.,Data,Present-day data telecommunications technologie
21、s include:Encoded information transmitted over traditional telephone lines Encoded information saved to fixed media,such as a hard disk,floppy disk,or CD ROMEncoded information exchanged between two computers that are directly connected by a single cableEncoded information exchanged by a group of co
22、nnected computers on a networkEncoded information exchanged by two devices over radio waves,Types of Telecommunications Companies,Service providers-those that supply the communications channels for voice and data transmission.服务提供商Equipment providers-those that supply the user and connectivity equip
23、ment,such as telephones.设备提供商,Growth of the Telecommunications Industry,The United States government recently released a report citing the number of high-speed lines connecting individuals and businesses to the Internet increased 36%during the first half of the year 2001,for a total of 9.6 million h
24、igh-speed connections.The number of minutes Americans spend on interstate long-distance telephone calls has quadrupled in the last 25 years to a total of 600 billion minutes.As of July 2001,the number of computers that provide files and Web pages to users on the Internet had grown to over 125 millio
25、n,maintaining a 63%annual growth rate.,Section 1.4 Telecommunication at Work生活中的电信 Financial Services,Call center-a facility dedicated to fielding customer calls.Interactive voice response(IVR)system-a method of sending information over the telephone by pressing buttons in response to recorded voice
26、 prompts,to answer routine questions.Automatic call distributor(ACD)-uses computerized devices attached to the phone lines to automatically route calls to specific phone extensions.,Financial Services,Utilities,Recent deregulation(the introduction of competition for services)in the utilities industr
27、y has made telecommunications even more critical to this industry.To persuade their customers not to choose another utility provider,utility companies must strive harder to please their customers,in part by answering questions as promptly as possible.An advanced call center at a utilities company ty
28、pically uses both an ACD and an IVR.,Manufacturing,The use of advanced voice,video,and data telecommunications in manufacturing has resulted in faster and more efficient production of goods and at the same time it has also increased global competition.Supply chain management,an electronic means for
29、connecting a manufacturer with its suppliers and distributors is a notable example of the use of telecommunications in the manufacturing industry.,Transportation,Examples of the transportation industrys use of telecommunications include:computerized flight control for airport trafficsoftware that is
30、sues maps and directions based on a given starting point and destinationgovernment-sponsored transportation hotlines that inform callers about road construction and hazardous road conditionssystems for suggesting the most efficient route between multiple locations,Retail,E-business-the use of data t
31、elecommunications to conduct business transactions.The apparel and sportswear segment of the retail industry uses particularly sophisticated and unique telecommunications technology for their online business.Before the products even reach a retailers point of sale(such as a Web site),telecommunicati
32、ons technology helps with manufacturing,quality control,inventory,distribution,and product shipping.,Healthcare,Telemedicine-a field that brings patients and healthcare professionals together by exchanging voice,video,and data over distances when they cant meet face-to-face.Improves the quality of h
33、ealthcare because ailments can often be diagnosed and treated faster.Also streamlines the record-keeping process for clinicians who spend a great deal of time entering data about their cases.,Government and Education,Many government agencies use advanced telecommunications to provide faster and easi
34、er access to public services.Telecommunications also plays a significant role in education.In South Carolina,a large public school district is improving education through distance learning.Distance learning-the use of telecommunications technology to inform,educate,or train students across distances
35、.,New Frontiers for Telecommunications Technology,Fiber optic cable-a transmission media that contains thin strands of fiber in its core and uses pulses of light to convey signals.Capable of carrying higher amounts of data,voice,or video within a given time span than any other type of media.,New Fro
36、ntiers for Telecommunications Technology contd,Quick Quiz,Listen to my question carefully.1.Fill in the blank2.Fill in the blank3.Fill in the blank,Section 1.5 Careers in Telecommunications电信职业,No matter what type of telecommunications position you seek,the following will serve you well:The ability
37、to install,maintain,and troubleshoot the system of cables and wires that carry telecommunications servicesA thorough knowledge of the public telephone network,and the carriers and regulations that are part of itFamiliarity with enhanced telephone services(such as IVR and ACD)A mastery of the basic p
38、rinciples of electricity,Careers in Telecommunications,No matter what type of telecommunications position you seek,the following will serve you well:A clear understanding of how computers accept and interpret data from other computers over a networkThe ability to design,install,and troubleshoot basi
39、c networksAn understanding of how the Internet worksFamiliarity with wireless transmission methods,Careers in Telecommunications,Areas within the field of telecommunications that you might consider specializing in:Networked convergence of voice,video,and dataElectronics and circuit design and engine
40、eringDevelopment of telephony and computer applicationsWireless telephony and networkingInformation security,Careers in Telecommunications,Quick Quiz,Listen to my question carefully.1.True or False2.True or False3.True or False,Section 1.6 Telecommunications Standard Organization 电信标准化组织,Standards-d
41、ocumented agreements containing technical specifications or other precise criteria that stipulate how a particular product or service should be designed or performed.American National Standards Institute(ANSI)-ensures that the test results from one manufacturer can be accurately compared to other ma
42、nufacturers results.Both ANSI and ITU are involved in setting standards for Integrated Services Digital Network(ISDN)communications.,ANSI,The ANSI(American National Standards Institute)-an organization composed of over a thousand representatives from industry and government who together determine st
43、andards for the electronics industry.ANSI does not dictate that manufacturers comply with their standards,but requests them to voluntarily comply.,TIA and EIA,The EIA(Electronics Industry Alliance)-is a trade organization composed of representatives from electronics manufacturing firms across the Un
44、ited States.TIA(Telecommunications Industry Association)-focuses on standards for information technology,wireless,satellite,fiber optics,and telephone equipment.,IEEE,IEEE(Institute of Electrical and Electronic Engineers)-an international society composed of engineering professionals.Its goals are t
45、o promote development and education in the electrical engineering and computer science fields.,ATIS,ATIS(The Association for Telecommunications Industry Solutions)-a North American trade association made of thousands of companies that provide communications equipment and services.Its membership revi
46、ews emerging technology and agrees on standards and operating procedures to ensure that services and equipment supplied by multiple companies can be easily integrated.,ISO,ISO(International Organization for Standardization)-a collection of standards organizations representing 130 countries with its
47、headquarters located in Geneva,Switzerland.Its goal is to establish international technological standards to facilitate global exchange of information and barrier-free trade.,ITU,The ITU(International Telecommunications Union)-a specialized United Nations agency that regulates international telecomm
48、unication usage,including radio and TV frequencies,satellite and telephony specifications,networking infrastructure,and tariffs applied to global communication.Provides developing countries with technical expertise and equipment to advance their technological base.,U.S.Government Regulatory and Legi
49、slative Bodies,Federal Communications Commission(FCC)-founded in 1934 in response to the growth and need for control over the telecommunications industry,is the primary national regulatory agency involved in telecommunications.Public Service Commission(PSC)-the states equivalent to the FCC.,Quick Qu
50、iz,Listen to my question carefully.1.Fill in the blank2.Fill in the blank3.Fill in the blank,Class Discussion Topics,1.Examples of present-day data communication2.How has telemedicine affected the quality of health care?Experiences with distance learning.,Summary,Communication is the conveyance and
