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6-1
Extranet Uses
6-2
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
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/gps/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 typesTelecommunications 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
6-12
VPN
6-13
Client/Server networks
Clients: End user personal computers or networked computers
Interconnected by LANsServers: manage networksProcessing 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
wireCopper 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 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
6-23
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
6-24
Wireless Web
Connect portable communications devices to the Internet
6-25
Telecommunications Processors
ModemsConvert digital signals from a computer into Analog frequencies that can be transmitted over
ordinary telephone lines