©2016 Effy Oz & Andy Jones : Management information system MANAGEMENT INFORMATION SYSTEMS CHAPTER 6 BUSINESS NETWORK & COMMUNICATION By Nadya Ferren w. NIM: 155030207121007 Brawijaya University ©2016 Effy Oz & Andy Jones : Management information system

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

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

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

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

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)

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

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

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

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

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

References wikipedia: Business networking. (2016, December 1). Retrieved December 17, 2016, from Wikipedia: https://en.wikipedia.org Jones, E. O. (2008). COURSE TECHNOLOGY (CENGAGE learning) - Management Information Systems. Retrieved 12 17, 2016, from http://lms.uop.edu.jo/lms/pluginfile.php/2005/mod_resource/content/1/ch-05.ppt