1. ©2016 Effy Oz & Andy Jones : Management information system
MANAGEMENT INFORMATION SYSTEMS CHAPTER 6 BUSINESS NETWORK & COMMUNICATION
By Nadya Ferren w. NIM:
Brawijaya University
©2016 Effy Oz & Andy Jones : Management information system

2. OBJECTIVES
Describe business and home applications of digital telecommunication.
Identify the major media and devices used in telecommunication.
Explain the concept of protocols.
Compare and contrast various networking and internet services
List networking technologies and trends that are likely to have an impact on businesses and information management in the near future.
Discuss the pros and cons of telecommuting

4. Telecommunication in Business
Telecommunication: transmittal of data and information and allows communications over large distance.
Advantages of telecommunications
Better business communication
Geographical distance irrelevant
Greater efficiency
Information becomes immediately available
Better distribution of data
Instant transactions
Flexible and mobile workforce
Alternative channels
However network security is risk

5. Bandwidth and Media BANDWIDTH MEDIA
The bandwidth of the medium is the speed at which data is communicated, which is also called the transmission rate or simply the bit rate. It is measured as bits per second (bps). Figure 6.1 shows common bit rate measurements.
Bandwidth is a limited resource. Usually, the greater the bandwidth, the higher the cost of the communications service.
Communications media—the means through which bits are transmitted—come in several types.
Media can be tangible, such as cables, or intangible, such as radio waves. The most available

6. Bandwidth Bandwidth: speed at which data are communicated
Bits per second: unit of measure for bandwidth
Baseband: carry only one transmission at a time
Broadband: carry multiple transmissions simultaneously

7. Transmission speed measurement
Bandwidth ( cont )
Transmission speed measurement
Bps
Bits per second
Kbps
Thousand bps
Mbps
Million bps (mega bps)
Gbps
Billion bps (giga bps)
Tbps
Trillion bps (tera bps)

8. Types of communications media
Tangible
Twisted pair cable: pairs of insulated copper wires twisted together
Twisting reduces electromagnetic interference
Low cost
Used in networking devices
Coaxial cable: for cable television transmission
Used for internet
Optical fibre: uses light to represent bits
Not susceptible to interference
Intangible media
Microwave radio technologies: high-frequency radio waves that can carry signals over long distances
Used in radio-frequency technologies
Signals transmitted by satellite links
Geostationary stallites are father away from the earth
Electrical power lines: electrical power grid used for telecommunication

9. Vulnerability to electromagnetic interference
Media ( cont )
Networking Media
Medium
Availability
Bandwidth
Vulnerability to electromagnetic interference
Twisted pair cable
High
Low to medium
Radio waves
Medium to high
Low (but vulnerable to RFI)
microwave
Low
Coaxial (TV) cable
Optical fibre
Moderate but growing
Highest
Nonexistent
Electric power lines (BPL)
Very high

10. Networks
Network: combination of devices (nodes) connected through communication channels. Any compatible device can transmit and receive on a network
Types of networks:
Local area network (LAN): established by single organization and shared among employees.
Server: single computer often used as central repository of programs and files for all computers
Peer-to-peer LAN: no central device controls communications
Wireless LANs (WLANs): easier installation and more scalable

11. Networks ( cont )
Metropolitan area network (MAN): links multiple LANs within large city
Wide area network (WAN): far-reaching system of networks composed of LANs or MANs
Value-added networks (VANs): networks with enhanced services
Reliability
Management
Maintenance
Internet service providers (ISPs): preferred method of conducting commerce
Personal area network (PAN): wireless network designed for handheld and portable devices
Used by one or two people
Transmission speed lower
Maximum distance 10 metres

12. Networing Hardware
Networks use variety of devices to connect computers and peripheral devices
Network interface card: connects through cable or wireless antenna to middle device
Middle device connects to LAN or WAN
Hub: central location to connect computers
Switch: controls direction of communications
Bridge: connects two networks
Router: routes data packets to next node
Repeater: amplifies or regenerates signals
Modem: translates communication signals form analog to digital and vice versa
Dial-up connection: slower type of connection through modem

13. References
wikipedia: Business networking. (2016, December 1). Retrieved December 17, 2016, from Wikipedia:
Jones, E. O. (2008). COURSE TECHNOLOGY (CENGAGE learning) - Management Information Systems. Retrieved 12 17, 2016, from