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Connecting to the Internet

Connecting to the Internet. Mrs. Wilson Internet Basics & Beyond RPHS. Protocol. A set of rules and conventions that describes the behavior that computers must follow in order to understand each other. TCP/IP is always needed to connect. Six Elements for Internet Connectivity are….

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Connecting to the Internet

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  1. Connecting to the Internet Mrs. Wilson Internet Basics & Beyond RPHS

  2. Protocol • A set of rules and conventions that describes the behavior that computers must follow in order to understand each other. • TCP/IP is always needed to connect.

  3. Six Elements for Internet Connectivity are…. • A computer— PC, handheld, mobile, Web TV • An operating system— Windows, Linux, Unix • TCP/IP (software)--Used to communicate with the Internet • Client Software--Web browser and E-mail • Internet Connectivity--Dial Up or Direct Connection • Internet Address--www.rphsbusiness.org or an e-mail address

  4. Connections • Dial Up • Like AOL/Net Zero • Speeds range from 14.4 kbps to 128 kbps • Direct • Cable • Wireless • DSL • ISDN • Satellite

  5. Asynchronous / Synchronous • Asynchronous communication is the transmission of data between two devices that are not synchronized with one another via a clocking mechanism or other technique. • The sender can transmit data at any time, and the receiver must be ready to accept information when it arrives. • Synchronoustransmission is a precisely timed stream of bits in which the start of a character is located by using a clocking mechanism.

  6. Synchronous? Asynchronous? Distance Learning Teleconferencing • Asynchronous? • Synchronous? What about: Telephone calls Instant Messaging E-mail?

  7. ISDN(Integrated Services Digital Network) • Does is require a phone line? • YES • What is its speed? • Typically 64 Kbps

  8. Connectivity • Measured in bits per second • Abbreviation of bits per second, the standard measure of data transmission speeds • Thousand bits per second is called “kilobits per second (Kbps).” • Million bits per second is called “megabits per second (Mbps).” • Billion bits per second is called“gigabits per second (Gbps).”

  9. Direct Connections • LAN (Local Area Network) • Uses a router • Wireless LAN • 802.11a, 802.11b, 802.11g • Cable TV—NIC card required • DSL (Digital Subscriber Line) • May replace ISDN • Many types of DSL (digital phone lines)

  10. Limitations of Cable/DSL • Speed limitations • Varies with type of plan • Different upload and download speeds • Upload and download limits • Assumes more downloading than uploading • Slower during peak hours

  11. Satellite Connections • Satellite dish • Not shared with TV services • Line-of-sight access to the sky • No obstructions • One-way connection • Used to download but needs modem to upload • Two-way connection • Both downloading and uploading… one faster than the other • Bandwidth limitations/E-mail issues

  12. Direct Connection Speeds

  13. Review • What is the difference between synchronous and asynchronous communication on the Internet? Which do you prefer? • Describe three methods of asynchronous communication. List them in order of your favorite. Explain why you prefer one method over another and describe why is it would be useful to you as a student. • Explore the MarcoPolo site and discuss the synchronous and/or asynchronous nature of the site. • Try your hand at "open heart surgery" as an alternate form of learning and "comic creator"

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