MANAGEMENT INFORMATION SYSTEMS

Managing the Digital Firm

Laudon and Laudon, 17th Edition

Chapter 7A
TELECOMMUNICATIONS, THE INTERNET,
AND WIRELESS TECHNOLOGY
Telecommunications and Networking in
Today’s Business World
• Networking and communication Trends
• Convergence:
• Telephone networks and computer networks converging into single digital
network using Internet standards
• E.g. cable companies providing voice service
• Broadband:
• More than 60% U.S. Internet users have broadband access
• Broadband wireless:
• Voice and data communication as well as Internet access are increasingly
taking place over broadband wireless platforms
Telecommunications and Networking in
Today’s Business World
• Networking and communication Trends
• Internet Subscribers in Bangladesh:
• Total internet subscriber 128.78 Million [September 2023]
• Around 2.7% annual growth for last two years.
Sep. 2021 Sep. 2022 Sep. 2023
Million % Million % Million %
Mobile Internet 118.71 92.18% 114.74 90.83% 119.77 90.56%
Broardband (ISP + PSTN) 10.07 7.82% 11.58 9.17% 12.49 9.44%

Total 128.78 126.32 132.26

Source: Bangladesh Telecommunication Regulatory Commission, September 2023

Telecommunications and Networking in
Today’s Business World
• What is a computer network?
• Two or more connected computers
• Major components in simple network
• Client computer
• Server computer
• Network operating system
• Network interfaces (NICs)
• Connection medium
• Hub or switch
• Routers
• Device used to route packets of data through different networks, ensuring that data sent
gets to the correct address
Telecommunications and Networking in
Today’s Business World
COMPONENTS OF A
SIMPLE COMPUTER
NETWORK

Figure 7.1
Illustrated here is a very
simple computer network,
consisting of computers, a
network operating system
residing on a dedicated
server computer, cable
(wiring) connecting the
devices, network interface
cards (NICs), switches, and
a router.
Telecommunications and Networking in
Today’s Business World
• Components of networks in large companies
• Hundreds of local area networks (LANs) linked to firmwide corporate network
• Various powerful servers
• Web site
• Corporate intranet, extranet
• Backend systems
• Mobile wireless LANs (Wi-Fi networks)
• Videoconferencing system
• Telephone network
• Wireless cell phones
Telecommunications and Networking in
Today’s Business World
CORPORATE
NETWORK
INFRASTRUCTURE

Figure 7.2
Today’s corporate network
infrastructure is a
collection of many different
networks from the public
switched telephone
network, to the Internet, to
corporate local area
networks linking
workgroups, departments,
or office floors.
Telecommunications and Networking in
Today’s Business World
• Key networking technologies
• Client/server computing
• Distributed computing model
• Clients linked through network controlled by network server
computer
• Server sets rules of communication for network and provides
every client with an address so others can find it on the network
• Has largely replaced centralized mainframe computing
• The Internet: Largest implementation of client/server computing
Telecommunications and Networking in
Today’s Business World
• Key networking technologies (cont.)
• Packet switching
• Method of slicing digital messages into parcels (packets), sending
packets along different communication paths as they become
available, and then reassembling packets at destination
• Previous circuit-switched networks required assembly of complete
point-to-point circuit
• Packet switching more efficient use of network’s communications
capacity
Telecommunications and Networking in
Today’s Business World
PACKED-SWITCHED
NETWORKS AND
PACKET
COMMUNICATIONS

Figure 7.3
Data are grouped into small
packets, which are
transmitted independently
over various
communications channels
and reassembled at their
final destination.
Telecommunications and Networking in
Today’s Business World
• Key networking technologies (cont.)
• TCP/IP and connectivity
• Connectivity between computers enabled by protocols
• Protocols: Rules that govern transmission of information between two points
• Transmission Control Protocol/Internet Protocol (TCP/IP)
• Common worldwide standard that is basis for Internet
• Department of Defense reference model for TCP/IP
• Four layers
1. Application layer
2. Transport layer
3. Internet layer
4. Network interface layer
Telecommunications and Networking in
Today’s Business World
THE TRANSMISSION CONTROL
PROTOCOL/ INTERNET PROTOCOL
(TCP/IP) REFERENCE MODEL

Figure 7.4
This figure illustrates the four layers of the
TCP/IP reference model for communications
Telecommunications and Networking in
Today’s Business World
• Signals: digital vs. analog
• Modem: Translates digital signals into analog form

FUNCTIONS OF THE MODEM

Figure 7.5
A modem is a device that translates digital signals into analog form (and vice versa) so that computers can transmit data over analog networks
such as telephone and cable networks.
Telecommunications and Networking in
Today’s Business World
Types of networks
• Local Area Networks (LANs) – Up to 500 Meters; an office or
floor of a building
• Campus Area Networks (CANs) – Up to 1,000 Meters; a collage
campus or corporate facility
• Peer-to-peer (p2p); Up to 10 users
• Wide Area Networks (WANs)
• Wide Area Networks (WANs) – A regional, transcontinental or global
area
• Metropolitan Area Networks (MANs) – A city or metropolitan area
Telecommunications and Networking in
Today’s Business World
• Topologies
• Star
• Ring
• Bus
• Mesh

NETWORK TOPOLOGIES

Figure 7.6
The four basic network
topologies are the star, ring, bus,
and mesh.
Telecommunications and Networking in
Today’s Business World
• Physical transmission media
• Twisted pair cable
• Coaxial cable
• Fiber optics cable and optical networks
• A fiber optic cable is a network cable that
contains strands of glass fibers inside an
insulated casing. They're designed for long
distance, high-performance data networking, and
telecommunications.
Telecommunications and Networking in
Today’s Business World
• Physical transmission media (cont.)
• Wireless transmission media and devices
• Microwave
• Satellites
• Cellular telephones
• Transmission speed
• Hertz
• Bandwidth
Telecommunications and Networking in
Today’s Business World
• Physical transmission media
Telecommunications and Networking in
Today’s Business World
BP’S SATELLITE
TRANSMISSION
SYSTEM

Figure 7.7
Communication satellites
help BP transfer seismic
data between oil
exploration ships and
research centers in the
United States.
Thank you
Chapter 7A