21322-1ppt_chap06 - Management Class

fullgorgedcutNetworking and Communications

Oct 24, 2013 (3 years and 9 months ago)

60 views

Management Information Systems, 4
th

Edition


1

Chapter 6

Information Technology in
Business: Telecommunications
and Networks

Management Information Systems, 4
th

Edition


2

Learning Objectives


Explain why successful managers must be familiar
with telecommunications concepts and
terminology


Describe the principles of communication within a
computer system and among computers


Identify the major media and devices used in
telecommunications


Management Information Systems, 4
th

Edition


3

Learning Objectives (Cont.)


List and explain the functions of different network
layouts and the concept of protocols


Explain how telecommunications can improve
operations in organizations


Cite the latest developments in telecommunications
media and transmission speed


Management Information Systems, 4
th

Edition


4

Telecommunications in Business


Transmittal of data from one computer to another
over a distance


Telecommunications has improved business in three
main ways:


Better communication


Higher efficiency


Better distribution of data

Management Information Systems, 4
th

Edition


5

Telecommunications in Daily Use


Cellular Phones


Videoconferences


Voice Mail


Facsimile


Information Kiosks


Pay at the Pump

Management Information Systems, 4
th

Edition


6


Easy Passing


Web
-
Based Electronic Commerce


Worldwide Peer
-
to
-
Peer File Sharing


Napster, Gnutella, BearShare, Morpheus


With directory


Without directory

Telecommunications in Daily Use
(Cont.)

Management Information Systems, 4
th

Edition


7

Telecommunications in Daily Use
(Cont.)

Management Information Systems, 4
th

Edition


8

Data Communications


Any transfer of data within a computer, between a
computer and another device, or between two
computers


Parallel and Serial Data Communications

Management Information Systems, 4
th

Edition


9

Data Communications (Cont.)

Management Information Systems, 4
th

Edition


10


Simplex


One
-
way in one direction


Half
-
Duplex


One
-
way in two directions


Full
-
Duplex


Two
-
way in two directions


Communication Direction

Management Information Systems, 4
th

Edition


11

Communication Direction (Cont.)

Management Information Systems, 4
th

Edition


12


Parity Check


Error detection method


Checks that no bits are added or deleted during
transmission


Odd Parity Check looks for an odd number of ones


Even Parity Check looks for even number of ones

Error Detection

Management Information Systems, 4
th

Edition


13


Communications
medium


Physical medium through which data can be
communicated


Telephone lines, television cables


Capacity


Speed at which data are communicated


Also called the
transmission rate


It is often called “bandwidth”


Bandwidth
is measured in
bits per second (bps)


The greater the capacity, the faster the transmission


Bandwidth and Media

Management Information Systems, 4
th

Edition


14

Bandwidth and Media (Cont.)

Management Information Systems, 4
th

Edition


15


Bandwidth


Narrowband

is low speed


Broadband

has greater capacity


Media


A medium is any means by which data can be
transmitted

Bandwidth and Media (Cont.)

Management Information Systems, 4
th

Edition


16


A medium’s capacity is determined by the range
of bits per second at which it can operate


Baud is the number of signals per minute


Repeater receives and strengthens signals before
sending them on

Transmission speed

Management Information Systems, 4
th

Edition


17

Transmission Speed (Cont.)

Management Information Systems, 4
th

Edition


18


Telephone line made of a pair of copper wires
twisted to reduce electromagnetic interference
(EMI)


Twisted Pair

Management Information Systems, 4
th

Edition


19

Coaxial Cable


Commonly used for cable television transmission


More expensive than twisted pair


Greater transmission rate than twisted pair


Much less susceptible to EMI


Management Information Systems, 4
th

Edition


20


High
-
frequency, short radio
-
frequency (RF) waves


Terrestrial microwave


Satellite microwave


Microwaves

Management Information Systems, 4
th

Edition


21

Optical Fiber


Fiber
-
optic technology uses light instead of
electricity to transmit data

Management Information Systems, 4
th

Edition


22

Characteristics of Media

Management Information Systems, 4
th

Edition


23

Modulation


Modification of a digital signal into an analog
signal


Demodulation


Modification of an analog signal into a digital
signal

Management Information Systems, 4
th

Edition


24


Analog vs. Digital


Analog: A continuous series of waves


Digital: A series of discrete bits

Modulation (Cont.)

Management Information Systems, 4
th

Edition


25

Modulation (Cont.)

Management Information Systems, 4
th

Edition


26

Modulation (Cont.)


Amplitude Modulation (AM)


Frequency Modulation (FM)


Phase Modulation


Modems


Devices that modulate and demodulate signals

Management Information Systems, 4
th

Edition


27

Modulation (Cont.)

Figure 6.9 Multiplexing

Management Information Systems, 4
th

Edition


28

Networks


LANs (Local Area Networks)


Networks within a building, or within a group of
adjacent buildings


WANs (Wide Area Networks)


Networks that cross organizational boundaries or
reach outside the company


Value
-
added networks (VANs)


Wireless communication


Management Information Systems, 4
th

Edition


29

Network Topology


Physical layout of the nodes in a network


Star


Ring


Bus


Tree

Management Information Systems, 4
th

Edition


30

Network Topology

Management Information Systems, 4
th

Edition


31

Networking Hardware


Network Interface Card


Hub


Switch


Bridge


Router

Management Information Systems, 4
th

Edition


32

Virtual Private Network


A combination of private and public lines


A link between a private network and the Internet


“Virtual” refers to the illusion that the use is
accessing a private network directly

Management Information Systems, 4
th

Edition


33

Protocols


Communication protocols


Rules governing the communication between
computers or between computers and other
computer
-
related devices


Network protocols


Rules governing a network of devices

Management Information Systems, 4
th

Edition


34

Protocols (Cont.)


LAN Protocols


Polling


Contention


Token passing


WAN Protocols


OSI (Open Systems Interconnection)


Standard protocol model


Seven layers

Management Information Systems, 4
th

Edition


35

Protocols (Cont.)

Management Information Systems, 4
th

Edition


36

Switching Techniques


Circuit Switching


Message is communicated in its entirety from the
transmitting computer to the receiving computer


Packet Switching


Message is divided into packets of bytes and
transmitted via several nodes


TCP/IP



Management Information Systems, 4
th

Edition


37

Switching Techniques (Cont.)

Management Information Systems, 4
th

Edition


38

The Changing Business
Environment


Cellular Phones


Teleconferencing


Voice Mail


Facsimile


Management Information Systems, 4
th

Edition


39

A Variety of Services


Cable


Digital Subscriber Line (DSL)


T1 and T3 Lines


Satellite


Fixed Wireless


Gigabit Ethernet


Optical Carrier

Management Information Systems, 4
th

Edition


40

A Variety of Services (Cont.)

Management Information Systems, 4
th

Edition


41

A Wireless Revolution


Popular Wireless Technologies


Would You Like Wi
-
Fi With That?


Combining Technologies

Management Information Systems, 4
th

Edition


42

Wireless Technologies (Cont.)

Management Information Systems, 4
th

Edition


43

Wireless Technologies (Cont.)

Management Information Systems, 4
th

Edition


44

Ethical and Societal Issues

Telecommuting: Pros and Cons


Pros


Saves travel cost and time


Decreases pollution


May reduce unemployment.


Productivity higher among telecommuters


Management Information Systems, 4
th

Edition


45

Ethical and Societal Issues

Telecommuting: Pros and Cons


Cons


Employers tend to pressure
telecommuters to work harder than
workers in the office.


No office to foster new social ties and
camaraderie.


May negatively impact some segments of
the economy


Restaurants


Downtown business and industries

Management Information Systems, 4
th

Edition


46

Summary


Telecommunications concepts and terminology


Communication within a computer system and
among computers


Telecommunications media and devices


Network layouts and protocols


Telecommunications impact on operations


Telecommunications developments and speed