Transcript The Wireless Revolution - management information systems

Telecommunications, the Internet,
and Wireless Technology
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
Chapter 7
• The Internet is the global system of interconnected computer
networks that use the Internet protocol suite (TCP/IP) to link
billions of devices worldwide. It is a network of networks that
consists of millions of private, public, academic, business, and
government networks of local to global scope, linked by a broad
array of wireless, and wired networking technologies.
• Internet connections (wired broadband and wireless broadband)
are provided by Internet Service Provider (ISP).
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
What is internet?
Technologies for wired broadband
-Digital Subscriber Line (DSL): Need to have a landline phone
Most
popular
form
of
DSL.
Available
in
-Fiber to the Home (FTTH): Use internet from optical fiber. Available in
Bangladesh. Example: Link3
-Cable internet connections: Provided by cable TV providers
-T lines: Dedicated lines for businesses and governments that require highspeed guaranteed service levels. Not available to end users.
•Connection medium:
• DSL: Telephone wire
• FTTH: Optical fiber
• Cable internet connection: Coaxial cable
• T lines: Telephone wire
• Speed ranges:
• DSL: 385 kbps to 40 mbps, FTTH: up to 150 mbps
• Cable internet connections: Most providers provide 1 mbps to 6 mbps
• T lines: T1- 1.54 mbps, T3- 45 mbps
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
-Asymmetric DSL (ADSL):
Bangladesh. Example: BTCL
The internet is based on the TCP/IP networking protocol to send
data from one computer to other computers
Each computer is assigned with a unique address called
Internet Protocol Address (IP Address).
IP address is represented by four strings of numbers ranging
form 0 to 255 separated by periods (dots)
Example: 207.43.123.421
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
Internet address
Major Internet services (Table 7.3 )
Chatting and instant messaging
Newsgroups
Telnet
File Transfer Protocol (FTP)
World Wide Web
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
E-mail
The World Wide Web


Website: A collection of web pages
HTML (Hypertext Markup Language):
– Formats documents for display on Web by using HTML tags
<Name> Kabid Md Surid </Name>
<address> Somewhere in Dhaka </address>
Hypertext Transfer Protocol (HTTP):

Communications standard used for transferring Web pages
from web server to the client computers.
E.g. http://www.megacorp.com
Uniform resource locators (URLs):

Addresses of Web pages
○ E.g. http://www.megacorp.com/content/features/082602.html
Web servers

Used for locating and managing Web pages
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
– Example:
Searching information on internet

Started in early 1990s as relatively simple software programs
using keyword indexes
Search engine marketing

Today, major source of Internet advertising revenue via search
engine marketing, using complex algorithms and page ranking
techniques to locate results
Shopping bots

Use intelligent agent software for searching Internet for
shopping information. Example: pricegrabber.com
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
Search engines
Web 2.0
•
Web 2.0




Interactivity: Search customized information as per user
criteria
Real-time user control: Update, delete, Copy, paste of
information; build applications on web using cloud computing
Social participation
User-generated content: You Tube videos
Technologies and services behind these features





Cloud computing
Blogs/RSS (Rich Site Summary)
Mashups: enables mix and match web contents to create
useful information
Wikis: Example- Wikipedia
Social networks: Build communities and friends
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
Four defining features
Cellular systems
Competing standards for cellular service

CDMA: Citycell
GSM: Grameenphone, Robi
Third-generation (3G) networks
– Speed range is 144 Kbps – 2Mbps
4G networks

Speed range is 100 Mbps – 1Gbps
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.

The Wireless Revolution
Wireless computer networks and Internet access
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
•
Bluetooth (802.15)


Links up to 8 devices in 10-m area
Useful for personal networking (PANs) and in business to
transmit data from handheld devices to other transmitters
Wi-Fi (802.11)



Set of standards: 802.11a, 802.11b, 802.11g, 802.11n
Used for wireless LAN and wireless Internet access
Use access points: Device with radio receiver/transmitter for
connecting wireless devices to a wired LAN
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
The Wireless Revolution
Wireless computer networks and Internet access
Wi-Fi (cont.)

Hotspots: Access points in public place to provide maximum
wireless coverage for a specific area

Weak security features
WiMax (802.16)

Wireless access range of 31 miles

Require WiMax antennas

Fix the problems of not having Wi-Fi and Fixed broadband
connectivity
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
•
The Wireless Computer Network
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
A
BLUETOOTH
NETWORK
(PAN)
Bluetooth
enables
a
variety
of
devices,
including cell phones,
PDAs, wireless keyboards
and mice, PCs, and
printers,
to
interact
wirelessly
with
each
other within a small 30foot (10-meter) area. In
addition to the links
shown, Bluetooth can be
used to network similar
devices to send data
from one PC to another,
for example.
FIGURE 7-15
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon
The Wireless Internet Access
AN 802.11 WIRELESS LAN
Copyright © 2013 Dorling Kindersley (India) Pvt. Ltd.
Mobile laptop computers
equipped with network
interface cards link to the
wired
LAN
by
communicating with the
access point. The access
point uses radio waves to
transmit network signals
from the wired network
to the client adapters,
which convert them into
data that the mobile
device can understand.
The client adapter then
transmits the data from
the mobile device back to
the access point, which
forwards the data to the
wired network.
FIGURE 7-16
Management Information Systems: Managing the Digital Firm, 12e
Authors: Kenneth C. Laudon and Jane P. Laudon