COMMUNICATIONS AND NETWORKS. -2 Competencies Discuss connectivity, the wireless revolution, and communication systems Describe physical and wireless communications.
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Presentation on theme: "COMMUNICATIONS AND NETWORKS. -2 Competencies Discuss connectivity, the wireless revolution, and communication systems Describe physical and wireless communications."— Presentation transcript:
-2 Competencies Discuss connectivity, the wireless revolution, and communication systems Describe physical and wireless communications channels Discuss connection devices Describe data transmission factors
-3 Competencies cont. Discuss networks and key network terminology Describe the different types of networks Describe network architectures Describe organizational uses of Internet technologies
-4 What is Communication? The process of sharing data, programs, and information between two or more computers
-9 Wireless Connections Infrared Broadcast radio Microwave Stations Bluetooth Satellite Uplink/Downlink Global Positioning System
-10 More on Satellites Global positioning Network of 24 satellites Owned by the Defense Department Global positioning system (GPS) Devices used to determine location Provides navigational support
-11 Connection Devices Types of signals Analog Digital Types of modems Internal External PC Card Wireless
-12 Types of Connections Digital subscriber line (DSL) Uses existing phone lines ADSL (Asymmetric digital subscriber line) Cable modems Uses existing TV cable Provides speeds as fast as DSL at a lower cost Satellite/air connection services Seven times faster than dial-up Slower than DSL & cable modem
-13 User Connection Costs & Speeds TypeFeeSpeedSeconds to Get Images Dial-up$1656 kbps45.0 DSL 501.5 mbps1.7 Cable Modem 401.5 mbps1.7 Satellite 70900 kbps2.8
-14 Bandwidth Measurement of the capacity of the channel Categories Low bandwidths or Voiceband Medium band Broadband Used for high capacity transmission Used by DSL, cable & satellite
-15 Protocols Set of communication rules Standard for Internet: TCP/IP Transmission control protocol/Internet protocol Identifies devices Reformats information
-16 Networks A computer network is a communication system Connects two or more computers Allows information exchange
-26 Internets and Extranets Intranets Private network within an organization Provides information to employees Extranets Private network that connects organizations Used to allow suppliers and others access Firewalls Security system Protects against external threats
-27 A Look to the Future Wireless Robotic Car Pod car (Personalization on Demand) Predicts and responds Designed to learn and adapt to an individual's driving needs and habits
-28 FAQs What is fiber-optic cable? My Palm Pilot uses Bluetooth. What is it? What is a modem? What is DSL? How does it work? How fast is broadband bandwidth? What is a local area network? What is meant by peer-to-peer?
-29 Discussion Questions Discuss what is meant by the wireless revolution. Discuss the four types of service connections. Discuss the advantages and disadvantages of the four network topologies. Explain the connections in a home network. Describe the different network topologies. Describe a GPS system.