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Published byArlene Boyd Modified over 7 years ago
6-1 Extranet Uses
6-2 Case 2: Maryland and Colorado Serving their customers without using wires Earth Alert Emergency Management System in Maryland provides Devices to communicate warning to individuals before a disaster, and Tools to collect timely information after a disaster Aurora Colorado Connects police and fire department vehicles via wire- less connections
6-3 Case Study Questions 1. What is the business value of advanced mobile technologies to Maryland’s emergency management services? 2. In what other government services could GPS serve to provide business value? Give some examples. 3. Are there disadvantages or risks associated with the deployment of GPS systems to monitor the location of people? Explain.
6-4 Real World Internet Activity 1. The global positioning system (GPS) is a major technological achievement that has broad-reaching implications for business. Using the Internet, See if you can find other innovative uses for GPS. Good places to start familiarizing yourself with current accomplishments are The GPSWorld site at http://www.gpsworld.com/gpsworld/ The GPS Overview at http://www.colorado.edu/geography/gcraft/notes/gp s/gps_f.html
6-5 Real World Group Activity The first Real World Case in this chapter discussed the combination of two existing technologies, RFID and wireless networking, to create an innovative business solution. In small groups, Brainstorm innovative applications of GPS and other existing technologies.
6-6 Telecommunications network Any arrangement where a sender transmits a message to a receiver over a channel consisting of some type of medium
6-7 Telecommunications network components Terminals: any input/output device that uses networks to transmit or receive data Telecommunications Processors: devices that support data transmission and reception Telecommunications Channels: media over which data are transmitted and received Computers: all sizes and types Telecommunications Control Software: programs that control telecommunications activities
6-8 Telecommunications network model
6-9 Wide Area Network (WAN) Telecommunications network that covers a large geographic area Source: Courtesy of Cisco Systems Inc.
6-10 Local Area Network (LAN) Connect computers within a limited physical area such as an office, classroom, or building
6-11 Virtual Private Networks (VPN) A secure network that uses the Internet as its backbone but relies on firewalls, encryption and other security A pipe traveling through the Internet
6-13 Client/Server networks Clients: End user personal computers or networked computers Interconnected by LANs Servers: manage networks Processing shared between clients and servers
6-14 Client/Server Network
6-15 Network Computing Networks are the central computing resource of the organization Thin clients: network computers and other clients provide a browser-based user interface
6-16 Peer-to-peer networks Networks that connect from one PC to another PC Common use is the downloading and trading of files
6-17 Peer-to-Peer Network
6-18 Telecommunications Media Twisted-pair wire: Ordinary telephone wire Copper wire twisted into pairs Source: Phil Degginger/Getty Images.
6-19 Telecommunications Media Coaxial cable: Sturdy copper or aluminum wire wrapped with spacers to insulate and protect it Source: Ryan McVay/Getty Images.
6-20 Telecommunications Media Fiber-optic cable: One or more hair-thin filaments of glass fiber wrapped in a protective jacket Source: CMCD/Getty Images.
6-21 Problem of “The Last Mile” Network providers use fiber optic to provide backbone But houses are connected to the backbone via twisted-pair Cannot get the benefit of the faster, better technology
6-22 Wireless Technologies Terrestrial microwave Earthbound microwave systems that transmit high- speed radio signals in a line-of-sight path Between relay systems spaced approximately 30-miles apart Communications satellites Satellite serves as relay stations for communications signals Uses microwave radio signals
6-23 Wireless Technologies Cellular and PCS telephone and pager systems Divide the geographic area into small areas or cells Each cell has transmitter or radio relay antenna to send message from one cell to another Wireless LANs Radio signals within an office or building Connect PCs to networks Bluetooth Short-range wireless technology To connect PC to peripherals such as printer
6-24 Wireless Web Connect portable communications devices to the Internet
6-25 Telecommunications Processors Modems Convert digital signals from a computer into Analog frequencies that can be transmitted over ordinary telephone lines
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