1 / 13

Introduction to ICT and Programming

Introduction to ICT and Programming . Lecture # 3 : Internet & World Wide Web. The World of The Internet. The Internet & the World Wide Web. Exploring Cyberspace. 2.1 Choosing Your Internet Access Device & Physical Connection: The Quest for Broadband

signa
Download Presentation

Introduction to ICT and Programming

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction to ICT and Programming Lecture # 3 : Internet & World Wide Web

  2. The World of The Internet

  3. The Internet & the World Wide Web Exploring Cyberspace • 2.1 Choosing Your Internet Access Device & Physical Connection: The Quest for Broadband • 2.2 Choosing Your Internet Service Provider (ISP) • 2.3 Sending & Receiving E-Mail • 2.4 The World Wide Web • 2.5 The Online Gold Mine: More Internet Resources, Your Personal Cyberspace, E-Commerce, & the E-conomy

  4. 2.1 Choosing Your Internet Access Device & Physical Connection • This section discusses the different technologies used to connect individuals to the internet including: • 1. Access device: a personal computer with a modem • 2. Physical connection: a telephone line

  5. Physical connection • The wired or wireless means of connecting to the Internet.

  6. Data Transmission Rates • Data is transmitted in bits per second. • bps stands for bits per second. A bit is the smallest unit of information used by computers. A computer with an older modem might have a speed of 28,800 bps per second. • Kbps stands for kilobits per second. This is the most frequently used measure. • Mbps stands for megabits per second • Gbps stands for gigabits per second

  7. Bandwidth • - an expression of how much data can be sent through a communications channel in a given amount of time • Broadband - very high speed connection

  8. Download & Upload • Download - to transmit data from a remote computer to a local computer • Upload - to transmit data from a local computer to a remote computer

  9. Telephone (Dial-Up) Modem: Low Speed but Inexpensive & Widely Available • Modem - device that sends and receives data over telephone lines to and from computers • Most modems today have a maximum speed of 56 Kbps. Using a modem and phone line to establish a connection to the Internet is called making a dial-up connection.

  10. High-Speed Phone Lines: More Expensive but Available in Most Cities • Integrated Services Digital network (ISDN) - hardware and software that allows voice, video, and data to be communicated over traditional copper-wire telephone lines. Speeds up to 128 kbps. • Digital Subscriber Line (DSL) - also uses regular phone lines but much faster than ISDN. Download speeds 1.5 – 8.4 Mbps • T1 - a traditional trunk line that carries 24 normal telephone circuits and has a transmission rate of 1.5 Mbps

  11. High-Speed Lines Cable : Close Competitor to DSL Speeds up to 10 Mbps Fiber Optics: Can support speeds up to 2 Gbps

  12. Wireless Systems: Satellite & Other Through-the-Air Connections • Satellite: With a pizza-size satellite dish on your roof, you can receive data at the rate of 400 Kbps from a communications satellite, a space station that transmits radio waves called microwaves from earth-based stations. • Other wireless connections:In urban areas, some businesses are using radio waves transmitted between towers that handle cellular phone calls, which can send data at up to 155 Mbps.

  13. Thank you • Thank you

More Related