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Extranet Uses

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Case 2: Maryland and ColoradoServing their customers without using

wiresEarth Alert Emergency Management System in

Maryland providesDevices to communicate warning to individuals

before a disaster, andTools to collect timely information after a

disasterAurora Colorado

Connects police and fire department vehicles via wire-less connections

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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.

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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/gps/gps_f.html

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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.

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Telecommunications network

Any arrangement where a sender transmits a message to a receiver over a channel consisting of some type of medium

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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 typesTelecommunications Control Software:

programs that control telecommunications activities

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Telecommunications network model

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Wide Area Network (WAN)

Telecommunications network that covers a large geographic area

Source: Courtesy of Cisco Systems Inc.

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Local Area Network (LAN)

Connect computers within a limited physical area such as an office, classroom, or building

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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

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VPN

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Client/Server networks

Clients: End user personal computers or networked computers

Interconnected by LANsServers: manage networksProcessing shared between clients and

servers

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Client/Server Network

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Network Computing

Networks are the central computing resource of the organization

Thin clients: network computers and other clients provide a browser-based user interface

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Peer-to-peer networks

Networks that connect from one PC to another PC

Common use is the downloading and trading of files

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Peer-to-Peer Network

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Telecommunications Media

Twisted-pair wire:Ordinary telephone

wireCopper wire

twisted into pairs

Source: Phil Degginger/Getty Images.

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Telecommunications Media

Coaxial cable:Sturdy copper or

aluminum wire wrapped with spacers to insulate and protect it

Source: Ryan McVay/Getty Images.

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Telecommunications Media

Fiber-optic cable:One or more hair-

thin filaments of glass fiber wrapped in a protective jacket

Source: CMCD/Getty Images.

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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

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Wireless Technologies

Terrestrial microwaveEarthbound microwave systems that transmit

high-speed radio signals in a line-of-sight pathBetween relay systems spaced approximately

30-miles apartCommunications satellites

Satellite serves as relay stations for communications signals

Uses microwave radio signals

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Wireless Technologies

Cellular and PCS telephone and pager systemsDivide the geographic area into small areas or

cellsEach cell has transmitter or radio relay antenna

to send message from one cell to anotherWireless LANs

Radio signals within an office or buildingConnect PCs to networks

BluetoothShort-range wireless technologyTo connect PC to peripherals such as printer

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Wireless Web

Connect portable communications devices to the Internet

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Telecommunications Processors

ModemsConvert digital signals from a computer into Analog frequencies that can be transmitted over

ordinary telephone lines