8.1 © 2006 by Prentice Hall Telecommunications, the Internet, & Wireless Technology...
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Transcript of 8.1 © 2006 by Prentice Hall Telecommunications, the Internet, & Wireless Technology...
8.1 © 2006 by Prentice Hall
Telecommunications,
the Internet,
& Wireless Technology
Telecommunications,
the Internet,
& Wireless Technology
8.2 © 2006 by Prentice Hall
TELECOMMUNICATIONS AND NETWORKING
• A networking and communications revolution led
by Internet-based technologies
• 1 billion instant messages per day
• 4 billion e-mails each day
• 65 million music files downloaded
8.3 © 2006 by Prentice Hall
• $769 billion spent in the United States on
telecommunications equipment and services
• Today, networking and the Internet are
synonymous with doing business.
8.4 © 2006 by Prentice Hall
Outline
• Telecommunications & Networking
• Communication Networks
• The Internet
• The Wireless Revolution
8.5 © 2006 by Prentice Hall
Outline
• Telecommunications & Networking
8.6 © 2006 by Prentice Hall
• Telecommunications environment provides connectivity by providing communication channels for text, voice, and video images.
The Business Telecommunications Environment
8.7 © 2006 by Prentice Hall
Components of a Simple Network
Figure 8-4
8.8 © 2006 by Prentice Hall
• A network consists of two or more connected computers.
• Each computer on the network contains a network interface device called a network interface card (NIC).
• The connection medium for linking network components can be a telephone wire, coaxial cable, or radio signal in the case of cell phone and wireless local area networks.
Networks and Corporate Infrastructure
8.9 © 2006 by Prentice Hall
• The network operating system (NOS) routes and manages communications on the network and coordinates network resources.
• Networks also contain a switch or a hub acting as a connection point between the computers.
• Hubs are very simple devices that connect network components, sending a packet of data to all other connected devices.
Networks and Corporate Infrastructure (Continued)
8.10 © 2006 by Prentice Hall
Corporate Network Infrastructure
Figure 8-2
8.11 © 2006 by Prentice Hall
The major trends in telecommunications:
• Rapid technological innovation has resulted in a proliferation of new hardware devices and new alternatives for business communications.
• Continuing telecommunications deregulation has encouraged competition and created many alternatives.
Networking and Communications Trends
8.12 © 2006 by Prentice Hall
• Growing dominance of Internet technologies in voice, video, and data communications
Networking and Communications Trends (Continued)
8.13 © 2006 by Prentice Hall
• Rapid growth in wireless telephone, wireless computer networks, and mobile Internet devices
• Growing scope of communication-intense services and products
Networking and Communications Trends (Continued)
8.14 © 2006 by Prentice Hall
• Client/Server Computing
• Packet Switching
• TCP/IP and Connectivity
Key Digital Networking Technologies
8.15 © 2006 by Prentice Hall
• Client/server computing is a distributed computing model in which some of the processing power is located within small, inexpensive client computers.
Client/Server Computing:
8.16 © 2006 by Prentice Hall
Packed-Switched Networks and Packet Communications
Figure 8-5
8.17 © 2006 by Prentice Hall
• In packet-switched networks, messages are first
broken down into small bundles of data called
packets.
• These packets are sent along different
communication paths and then the packets are
reassembled once they reach their destinations.
Packet Switching:
8.18 © 2006 by Prentice Hall
• Packet switching makes more efficient use of the
communications capacity of a network.
• The packets include information for directing the
packet to the right address and for checking
transmission errors along with the data.
Packet Switching: (Continued)
8.19 © 2006 by Prentice Hall
• TCP/IP is the communications protocol used by the Internet and all Internet devices.
• TCP/IP provides for breaking up digital messages into packets, routing them to the proper addresses, and then reassembling them into coherent messages.
• TCP/IP uses a suite of protocols: TCP and IP.
TCP/IP and Connectivity:
8.20 © 2006 by Prentice Hall
Outline
• Telecommunications & Networking
• Communication Networks
8.21 © 2006 by Prentice Hall
Signals & the Modem
Figure 8-7
8.22 © 2006 by Prentice Hall
Types of Networks
Type Area
Local Area Network (LAN) Up to 500 meters (half a mile); an office or floor of a building
Campus Area Network (CAN) Up to 1,000 meters (a mile); a college campus or corporate facility
Metropolitan Area Network (MAN)
A city or metropolitan area
Wide Area Network (WAN) Transcontinental or global area
8.23 © 2006 by Prentice Hall
• Twisted Wire
• Coaxial Cable
• Fiber Optics and Optical Networks
• Wireless Transmission
Physical Transmission Media
The different kinds of physical transmission media used by the networks are:
8.24 © 2006 by Prentice Hall
Broadband Network Services and Technologies
A number of network services and technologies are
available to companies that need high-speed
transmission or access to the Internet.
8.25 © 2006 by Prentice Hall
Outline
• Telecommunications & Networking
• Communication Networks
• The Internet
8.26 © 2006 by Prentice Hall
THE INTERNET
• A network composed of computers and other
devices that are logically linked together by a
unique address space based on the Internet
Protocol
8.28 © 2006 by Prentice Hall
THE INTERNET
• E-mail: Person-to-person messaging; document sharing
• Usenet newsgroups: Discussion groups on electronic bulletin boards
• LISTSERVs: Discussion groups using e-mail mailing list servers
• Chatting and instant messaging: Interactive conversations
Major Internet Services
Table 8-6
8.29 © 2006 by Prentice Hall
• Telnet: Logging on to one computer system and
doing work on another
• FTP: Transferring files from computer to computer
• World Wide Web: Retrieving, formatting, and
displaying information (including text, audio,
graphics, and video) using hypertext links
Major Internet Services (Continued)
Table 8-6 (Continued)
8.30 © 2006 by Prentice Hall
Client/server Computing on the Internet
Figure 8-11
8.31 © 2006 by Prentice Hall
• Hypertext• Uniform Resource Locator (URL)• Web servers• Website• Web page, Home page• Searching for information on the Web
The World Wide Web
8.32 © 2006 by Prentice Hall
Major Web Server Providers
Figure 8-12
Source: Based on data from Netcraft Web Server Survey, July 2004,www.serverwatch.internet.com/netcraft.
8.33 © 2006 by Prentice Hall
THE INTERNET
• The Internet lowers search costs
• Search engines
• Intelligent agents and shopping bots
• Broadcast and push technology
• Search engine marketing
Searching and Finding Information on the Internet
8.34 © 2006 by Prentice Hall
THE INTERNET
• Wikis
• Blogs
• RSS – Really Simple Syndication
Web 2.0
8.35 © 2006 by Prentice Hall
Intranets:
• An intranet is an internal organizational network that provides access to data across a business firm. • Firewall
Extranets:
• Allow authorized vendors and customers to have limited access to its internal intranet
Intranets and Extranets
8.36 © 2006 by Prentice Hall
• Groupware: Provides capabilities for supporting
enterprise-wide communication and
collaborative work
• Electronic conferencing tools: Provides a virtual
conference table where participants can view
and modify documents and slides or share their
thoughts and comments using chat, audio, or
video
Groupware and Electronic Conferencing
8.37 © 2006 by Prentice Hall
• Voice over IP (VoIP) technology: Uses the Internet
Protocol (IP) to deliver voice information in digital form
using packet switching
• Unified messaging systems: Combine voice mail, e-
mail, and faxes so they can all be obtained from one
system
Internet Telephony
8.39 © 2006 by Prentice Hall
The Growth of Internet Telephony
Figure 8-14Source: Infotech and authors.
8.40 © 2006 by Prentice Hall
• A virtual private network based on the Internet
Protocol provides a secure connection between
two points across the Internet, enabling private
communications to travel securely over the
public infrastructure
Virtual Private Networks
8.41 © 2006 by Prentice Hall
Outline
• Telecommunications & Networking
• Communication Networks
• The Internet
• The Wireless Revolution
8.42 © 2006 by Prentice Hall
• Mobile phones
• Laptops
• PDA’s
• E-mail handhelds (e.g. Blackberry)
• Smart phones (Hybrid – phone + PDA)
Wireless Revolution
8.43 © 2006 by Prentice Hall
• GSM – Global System for Mobile Communicationo International roaming
• CDMA – Code Division Multiple Accesso Cheapero Higher quality voice
Cellular Network Standards
8.44 © 2006 by Prentice Hall
• Bluetooth
• PAN, 8 devices, 30’ radius
• Wi-Fi
• Access point
• Range - 300’
• WiMax
• Range – 31 miles
• 75 mbs
• Broadband cellular access for PC’s
Wireless Computer Networks
8.45 © 2006 by Prentice Hall
Summary
• Telecommunications & Networking
• Communication Networks
• The Internet
• The Wireless Revolution