Presentation is loading. Please wait.

Presentation is loading. Please wait.

Introduction to MIS1 Copyright © 1998-2002 by Jerry Post Introduction to MIS Chapter 3 Networks and Telecommunications.

Similar presentations

Presentation on theme: "Introduction to MIS1 Copyright © 1998-2002 by Jerry Post Introduction to MIS Chapter 3 Networks and Telecommunications."— Presentation transcript:

1 Introduction to MIS1 Copyright © by Jerry Post Introduction to MIS Chapter 3 Networks and Telecommunications

2 Introduction to MIS2 Networks Teamwork Communication Scheduling Sharing Internet Suppliers Customers Banks Internal External

3 Introduction to MIS3 Outline Introduction Sharing Data Sharing Hardware Sharing Software Components of a Network Computers Media Connection Devices Software Network Structure Shared Media Switched Standards The Internet How the Internet Works Internet 2 Mobile Commerce Global Telecommunications Technical Problems Political Complications Cultural Issues Comment Cases: Specialty Retail Appendix: Creating Web Pages

4 Introduction to MIS4 Sharing Data: Transactions Database Management System and Web Server Internet

5 Introduction to MIS5 Team Document File Server and Database Data and Tools Report and Comments Sharing Data: Decisions & Searches Decisions & searches Teamwork & joint authorship

6 Introduction to MIS6 Sharing Data: Internet 1. User creates message. 2. Message transferred to account on server. 3. Transferred via the Internet to the destination account. 4. Message received when user checks e- mail.

7 Introduction to MIS7 Sharing Data: Calendars 8:00Mgt meeting 8:30(open) 9:00Staff meeting 9:30Staff meeting 10:00new meeting

8 Introduction to MIS8 Hardware Sharing Printers Storage Processors Files are transferred from workstations to the server. Software automatically copies files to tapes. LAN administrator can restore files if needed. Corporate or external computer access Server Shared Printer Workstations tape drive (backup)

9 Introduction to MIS9 Voice Computer Sent as packets: Sent as packets: A B C D E Chicago New York Dallas Atlanta E 4 C B 2 A 1 5 D 3 Packet-Switched Networks Data, Voice, Video All converted to packets Packet has data, destination, and source address Switched services Packets routed as needed Reassembled at destination

10 Introduction to MIS10 Network Components Computers Servers Work stations Media Cables Fiber optic Radio Infrared Connection devices LAN card Shared Printer Server Personal Computer Router or Switch Internet Firewall

11 Introduction to MIS11 Server Scalability Sun Sun 3800 Sun Ultra 5 Compaq Increasing performance within a product family. Server farms distribute the workload. Add more computers for more power. Rack mount server farm.

12 Introduction to MIS12 Network Transmission Media Electricity Fiber optics Radio waves Coaxial Example: Cable TV Shield Radio or Micro Waves Example: Cellular phones glass or plastic Fiber Optic Cable Example: Long distance phone lines antenna Twisted Pair Example: Local phone lines reflective cladding

13 Introduction to MIS13 Fiber Optics Faster More data Less magnetic interference Long stretches without repeaters 900 copper wires can be replaced by one fiber optic line (for telephone connections).

14 Introduction to MIS14 Frequency Spectrum All waves behave similarly Sound Radio Micro Light Frequency differences Amount of data Distance Interference / Noise ELFVLFLFMFHFVHFUHFMicrowaveOptical 1001K100K1M10M100M1G10G Hertz Navy/submarines TV: 220M MHz AM: 550K KHz Public Safety: 150M MHzPublic Safety: 460M MHz Cellular phones: 800 MHz Cordless phones (some): 900 MHz Pers. Com. Sys (PCS): 1.85 G GHz PCS ET: 2 GHz TV: 54M MHz FM: 88M MHz

15 Introduction to MIS15 Transmission Capacity A thin fiber optic cable can carry as much data as 900 single copper wires, with minimal interference, and superior tensile strength.

16 Introduction to MIS16 The Importance of Bandwidth

17 Introduction to MIS17 Shared Connections With shared connections, machines have to take turns, and congestion can slow down all connections. With switched connections, each computer has the full bandwidth of the connection at all times. Performance depends on how fast the switch can handle connections.

18 Introduction to MIS18 Time Division AB DC time ACACA Computers A and B split their messages into packets and share the transmission medium by taking turns sending the data.

19 Introduction to MIS19 Frequency Division AB DC frequency 3500 Hz A C Computers A and B split the frequency: A uses a higher spectrum. By listening only to the assigned frequency, multiple transmissions can occur at the same time.

20 Introduction to MIS20 Spread Spectrum AB DC frequency time Sharing a medium by both frequency and time is one method of spread spectrum transmission. It is efficient for many computers because the full bandwidth can be utilized over time and frequency.

21 Introduction to MIS21 Wireless Communication Microwave transmissions are used to provide communications for cellular phones and laptop computers. As prices of phones, portable computers, and communication costs decrease, increasing numbers of workers are choosing wireless technologies.

22 Introduction to MIS22 Connecting Networks The need for standards A changing environment Backbone fiber optic Hub Switch Hub Radio-based network Internet Routers or Switches

23 Introduction to MIS23 Shared-Media Network Shared Media Tap

24 Introduction to MIS24 Switched Network Switch Servers Workstations/PCs

25 Introduction to MIS25 Building 1 Building 2 Enterprise Network Switch Servers Workstations/PCs Fiber optic Internet – ISP Firewall Subsidiary

26 Introduction to MIS26 Client/Server Network Client server Peer-to-peer Operating system Multitasking Server Clients Workgroup Printer

27 Introduction to MIS27 TCP/IP Reference Model Message Header 3Trailer 3Message Header 3Trailer 3MessageHeader 3Trailer 3MessageHeader 2Trailer 2 Header 3Trailer 3MessageHeader 3Trailer 3MessageHeader 2Trailer 2Header 1Trailer 1 4. Application 3. Transport (TCP) 2. Internet (IP) 1. Physical

28 Introduction to MIS28 TCP/IP Reference Application Mail, Web, FTP Authentication, compression, user services Transport Packetize data and handle lost packets Establish connections through numbered ports Internet Protocol (IP) Route packets to destination Requires unique host addresses: IPv4=32-bit; IPv6=128-bit Requires standards and cooperation Subnet Physical connections Transfers bits with some form of error correction

29 Introduction to MIS29 ISO-OSI Reference Model Application Presentation Session Transport Network Data Link Physical Layer 7 Layer 6 Layer 5 Layer 4 Layer 3 Layer 2 Layer 1 Application Presentation Session Transport Network Data Link Physical Physical Media Original Data Translate Sign on and resources Data Packet R Add routing data RAC Addresses & Error Check RACRAC

30 Introduction to MIS30 The Internet Introduction to the Internet No control Services Mail Telnet FTP WWW WEB searching AltaVista HotBot Lycos WebCrawler Yahoo

31 Introduction to MIS31 How the Internet Works Individual Internet service provider (ISP) Phone company Network service provider (NSP) Backbone network Phone company Company Web site Dial-up: Kbps ISDN: 128 Kbps DSL: 256 Kbps - 6 Mbps Cable: 1 to 10 Mbps Cable company T1: Mbps T3: Mbps OC3: Mbps OC12: 622 Mbps

32 Introduction to MIS32 Internet Connections Backbone providers AT&T GTE Worldcom/MCI Sprint Qwest Network service providers 1998: 39 AGIS AT&T Cable & Wireless IBM MCI/Worldcom Qwest Sprint UUNet Phone companies Regional Bell operating companies (RBOCs) (6) Competitive local exchange carriers (CLECs) (new) Cable companies AT&T Cablevision Regional. Satellite Direct Satellite Starband Internet service providers America Online Microsoft Network Earthlink

33 Introduction to MIS33 M-Commerce Internet access everywhere Cell phones PDAs Laptops Great potential Limited usability Better than voice?

34 Introduction to MIS34 Cell Phones and Wireless Communication Wireless cells work by handing off the wireless connection to the next tower as the caller moves. Connections to multiple towers at one time enables the system to triangulate to get a fairly precise location of the cellular device--even when it is not in a call. Location knowledge will make it possible (although perhaps not desirable) to offer new business opportunities as people move into range.

35 Introduction to MIS35 Global Telecommunications Technical problems Multiple standards Language Developing nations Time zones Limits to space & waves Political complications Transborder data flows Taxes Privacy Accessibility Cultural issues What is an object? Management & control

36 Introduction to MIS36 Cases: Specialty Retail

37 Introduction to MIS37 Cases: Ben & Jerrys

38 Introduction to MIS38 Appendix: Creating Web Pages Determine the content. Define a style. Create each page. Text Graphics Link the pages. Test your work. Transfer pages to a Web site.

39 Introduction to MIS39 Appendix: Style Sheets BODY { margin-left: 5px; font: 10pt "Times New Roman", Times, serif; color: black; text-align: left; background-color: #e0ffff; } P { margin-left: 0px; font: 10pt "Times New Roman", Times, serif; color: black; background: transparent; } H1 { margin-left: 0px; font: 16pt "Times New Roman", Times, serif; color: black; font-weight: bold; background: transparent; } Page 3 Page 2 Page1 Style Sheet Body { … } P {…}

40 Introduction to MIS40 Appendix: Sample HTML Sample HTML Page Section One This is a sample paragraph on a sample page.

41 Introduction to MIS41 Appendix: Publishing Files Your computer Web server Internet or intranet Initial pages Accessible Web pages Transfer methods: Microsoft Front Page extensions FTP: file transfer protocol

42 Introduction to MIS42 Web Development Hints Start with a tool like Microsoft Word (or Front Page, etc.). Get a good graphics package Keep page size small 30, ,000 bytes typically takes seconds First develop the pages on your own computer. Test all links. Transfer later. Use style sheets. Consistency. Ease of change. Study design elements and art. Formal training/art classes. Study other sites. Watch for and create trends.

Download ppt "Introduction to MIS1 Copyright © 1998-2002 by Jerry Post Introduction to MIS Chapter 3 Networks and Telecommunications."

Similar presentations

Ads by Google