Introduction to Introduction to Communications Communications
Part One: Overview Part One: Overview
Kuang Chiu HuangKuang Chiu HuangTCM NCKUTCM NCKU
Spring/2008Spring/2008
Information Forerunner Information Forerunner • Keep in touch with telecom related
news, reports and data• Analyze those information and try to
figure out the trend of telecom development and rationale of carriers’ investment strategies
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News, Report, and Data News, Report, and Data • Source: Information from Taiwan and
foreign countries• News: Yahoo Technology News,
CommunicationDirect News, BBC Technology news
• Report: NCC, FCC, NTIA • Data: Carrier’s website• Blog: Cybertelecom blog, GigaOm,
TeleFriden
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Goals of This ClassGoals of This Class• A clear picture in your mind to know
about communications networks and basic components. After this course, you are enabled to identify different topologies of communication networks and explain their five components.
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Warm Up Warm Up • Any question?
• What are differences between communications & telecommunications
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1-1 DATA COMMUNICATIONS1-1 DATA COMMUNICATIONSTelecommunication is the
assisted transmission of signals over a distance for the purpose of communications
through electronic devices電信法 : 指利用有線、無線,以光、電磁系統或其他科技產品發送、傳 輸或接收符號、信號、文字、
影像、聲音或其他性質之訊息。簡而言之 : 指利用電子技術在不同的地點之間傳遞
信息
ComponentsData RepresentationData Flow
Topics discussed in this section:Topics discussed in this section:
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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 . A node can be a computer, printer, or any other node can be a computer, printer, or any other device capable of sending and/or receiving data device capable of sending and/or receiving data generated by other nodes on the networkgenerated by other nodes on the network ..
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1-2 Topics of Networks1-2 Topics of Networks
Distributed processing:Network Criteria: Physical Structures: Network Models: Categories of Networks: Interconnection of Networks:
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1-2 Network Criteria1-2 Network Criteria
Distributed processing: a task is divided among multiple computers. Instead of a large machine Network Criteria:
Performance: how good it is (throughput and delay) Reliability:frequency of failure Security: protecting data from unauthorized
access, damage and change
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1-2 Network Physical Structure & Categories1-2 Network Physical Structure & Categories
Physical Structures: P2PP2MP
Network Models: ISO’s OSI Categories of Networks:
LAN: local area network WAN: wide area network MAN: metropolitan area network
Interconnection of Networks: Internetwork
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1-3 THE INTERNET1-3 THE INTERNET
The The InternetInternet has revolutionized many aspects of our daily has revolutionized many aspects of our daily lives. It has affected the way we do business as well as the lives. It has affected the way we do business as well as the way we spend our leisure time. The Internet is a way we spend our leisure time. The Internet is a communication system that has brought a wealth of communication system that has brought a wealth of information to our fingertips and organized it for our use. information to our fingertips and organized it for our use.
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1-3 THE INTERNET BACKGROUND 1-3 THE INTERNET BACKGROUND
Why: Connect computers together to exploit Why: Connect computers together to exploit valuable resources valuable resources Where: from the US Where: from the US Who: DoD ARPA (ARPANET) Who: DoD ARPA (ARPANET) When: mid-1960s When: mid-1960s What: IMP (interface message process) as What: IMP (interface message process) as communication device to connect four nodes communication device to connect four nodes together together How: NCP (network control protocol) to How: NCP (network control protocol) to Internetting Project to TCP/IPInternetting Project to TCP/IP
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1-4 PROTOCOLS AND STANDARDS1-4 PROTOCOLS AND STANDARDS
In this section, we define two widely used terms: In this section, we define two widely used terms: protocolsprotocols and and standardsstandards. First, we define protocol, which is . First, we define protocol, which is synonymous with rule. Then we discuss standards, which synonymous with rule. Then we discuss standards, which are agreed-upon rules.are agreed-upon rules.
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Homework 2Homework 2
Type your answers in A4 size papers with your name
• Page 24: #4, #8, #9, #12, #13, #16 #17
• Page 25: #21, #24
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