Telecommunication and Networks Group Akhmedov Ilkhom

Slide 2 Telecommunication Principles and Applications Communication The exchange of information between two parties Telecommunication Communication at a distance

Slide 3 Telecommunication Principles and Applications Dimensions of Telecommunication Distance significantly affects options for communication Organizational context establishes the nature of the relationships between the communicating parties

Slide 4 Dimensions of Telecommunication DimensionPossible Values Distance Face-to-face Building or campus Metropolitan area Wide area Organizational Context Organizational members only Organizational members and partners Public Human/Computer Context Human/Human Human/Computer (Input/Output) Computer/Computer

Slide 5 Telecommunication Principles and Applications Telecommunication Process Sender initiates message communication Device puts senders message onto a telecommunication medium Telecommunication medium transfers message to receivers location

Slide 6 Telecommunication Principles and Applications Telecommunication Process Device takes message off the communication medium Recipient receives the message

Slide 7 Telecommunication Principles and Applications Types of Business Applications Coordination of business activities Group decision making Electronic commerce

Slide 8 Telecommunication Infrastructure Communication Carriers Telephone Carriers Local Exchange Carriers (LECs) Long Distance Carriers Cellular Services Cable Providers Value Added Networks (VANs) Resells transmission capacity with additional services

Chapter 5Slide 9 Telecommunication Infrastructure International Issues Monopoly government providers in many countries Decreasing regulation worldwide Cross-border data flow regulations Differences in privacy rules

Chapter 5Slide 10 Telecommunication Technology Standards Characteristics of telecommunications media, hardware, and software Open Systems Interconnection (OSI) Model Provides a framework for thinking about communication standards

Chapter 5Slide 11 Telecommunication Technology The Computer/Medium Interface Modem Converts digital computer output to signal needed for transmission and vice versa Adaptor/NIC Interface between computer and a network

Chapter 5Slide 12 Telecommunication Technology Transmission Media Twisted pair wire Coaxial cable Fiber optic cable Microwave signals Infrared signals Radio signals

Chapter 5Slide 13 Telecommunication Technology Switching and Routing Technologies Devices Hub Switch Router Gateway Protocol Standard for how a message is packaged, secured, sent routed, received, and acknowledged by the receiver within a network

Chapter 5Slide 14 Telecommunication Technology LAN Protocols Ethernet Token ring Wi-Fi Bluetooth

Chapter 5Slide 15 Telecommunication Technology Figure 5-9

Chapter 5Slide 16 Telecommunication Technology WAN Services Leased lines Switched circuit data services Packet switched services Cellular services

Chapter 5Slide 17 Internet Concepts Who Manages The Internet? Companies, individuals, and governments own pieces of the Internet, but the Internet as a whole has no owners or operators

Chapter 5Slide 18 Internet Concepts Network Addressing IP Number Consists of two partsa network number and a device number Domain Name Translated to IP number by Domain Name Servers (DNSs)

Chapter 5Slide 19 Network Management Simple Network Management Protocol Defines how network devices maintain and communicate information about their own activity and performance

Chapter 5Slide 20 Network Management Network Analyzer Plugs into a network and analyzes the traffic that passes by or through it

Chapter 5Slide 21 Network Management Network Management Software Device management Recognizes the devices, including computers and printers, that are connected to the network Security services Provide entry into the network and establish a relationship between a user and a client station

Chapter 5Slide 22 Network Management Network Management Software File services Provide access to shared files Print services Provide central access to a common printer Fax services Allow network users to send or receive a facsimile electronically

Chapter 5Slide 23 Network Management Network Management Software Directory services Provide an enterprise-wide telephone book that identifies and connects network users to each other and to software

Chapter 5Slide 24 Ensuring Telecommunication Security Key: A secret code that can scramble or unscramble a message Public Key Cryptography Uses a pair of keys Message scrambled by one key can only be unscrambled by the other

Chapter 5Slide 25 Ensuring Telecommunication Security Figure 5-9 Public Key Cryptography

Chapter 5Slide 26 Ensuring Telecommunication Security Public key cryptography ensures Security Non-repudiation Authentication Requires certificate authority Non-repudiation Via digital signature Integrity

Slide 27 Ensuring Telecommunication Security Firewall Hardware and/or software intended to separate an organizations intranet, and the data on it, from its extranet and the Internet Virtual Private Network (VPN) Simulates a private network by using a public network, such as Internet, and security protocols

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