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

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Presentation transcript:

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…. 1.A computer— PC, handheld, mobile, Web TV 2.An operating system— Windows, Linux, Unix 3.TCP/IP (software)-- Used to communicate with the Internet 4.Client Software-- Web browser and 5.Internet Connectivity-- Dial Up or Direct Connection 6.Internet Address-- or an address

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

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. Synchronous transmission is a precisely timed stream of bits in which the start of a character is located by using a clocking mechanism.

Distance Learning Synchronous? Asynchronous? Teleconferencing Synchronous? Asynchronous? What about: Telephone callsInstant Messaging ?

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

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).”

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

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

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/ issues

Direct Connection Speeds T Mbps Commonly used by North America ISPs. Fast & costly E Mbps. European equivalent of T3 T Mbps. Commonly used in North America corporate LANs to connect ISPs E Mbps. European equivalent of T1 Cable Modem512 Kbps to 52 Mbps. xDSL512 Kbps to 10 Mbps. Satellite200 Kbps to 1 Mbps (download speed) Home connections between Kbps.

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.MarcoPolo site Try your hand at "open heart surgery" as an alternate form of learning and "comic creator"open heart surgerycomic creator