tailieunhanh - Lecture Introduction to Computers: Chapter 9B - Peter Norton's

Even a home computer user can be part of a truly global network. A connection to the Internet makes your home computer one of the millions of nodes on the vast Internet network. You can share files, collaborate, communicate, and conference with people on the other side of the globe. This lesson examines some of the most common ways of transmitting data via networks and the Internet. | McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 9B Data Communications Modem Communications Plain Old Telephone System (POTS) Standard phone line Two-way voice communication Uses analog transmission techniques Data communication is slow 9B- Insider Information The actual name used by phone technicians is Public Switched Telephone Network (PSTN). Mention POTS to the wrong technician and you will get an earful! Modem Communications Modems Modulator/Demodulator Modulator converts digital to analog Speed measured in bits per second (bps) Current fastest speed is 56 Kbps Quality of phone lines dictates speed is the current modem standard Several modem types Internal External Voice Fax 9B- Insider information The Federal Communications Commission (FCC) limits modem speed over an analog line to 53Kbps. Teaching tip Determine what your local ISPs support. If your ISPs do not support , suggest to your students to purchase a modem. They will likely save $10 on the purchase and see no performance difference. Modem Communications Modem uses Connection to the Internet File transfer Uploading Downloading 9B- Teaching tip Draw a diagram showing the Internet ‘above’ the client computer to illustrate where the names come from. Digital Data Connections Digital phone lines Local telephone companies are upgrading Service will faster and more reliable New phones will be needed Modems will need to be upgraded 9B- Digital Data Connections Broadband connection Any data connection faster than 56 Kbps Common in business Becoming popular in home installations 9B- Digital Data Connections ISDN lines Integrated Services Digital Network Basic rate uses three channels Two data channels each support 64 Kbps Error correction channel Primary rate uses 24 data channels 9B- ISDN Connection 9B- Digital Data Connections T lines High-capacity voice/data lines Used to control phone and data Several | McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 9B Data Communications Modem Communications Plain Old Telephone System (POTS) Standard phone line Two-way voice communication Uses analog transmission techniques Data communication is slow 9B- Insider Information The actual name used by phone technicians is Public Switched Telephone Network (PSTN). Mention POTS to the wrong technician and you will get an earful! Modem Communications Modems Modulator/Demodulator Modulator converts digital to analog Speed measured in bits per second (bps) Current fastest speed is 56 Kbps Quality of phone lines dictates speed is the current modem standard Several modem types Internal External Voice Fax 9B- Insider information The Federal Communications Commission (FCC) limits modem speed over an analog line to 53Kbps. Teaching tip Determine what your local ISPs support. If your ISPs do not support , suggest to your students .

• Hệ điều hành
• Introduction to Computers
• Computer systems
• Computer science
• Standard telephone lines
• Digital data connections
• Wireless networks
• Discovering Computers
• A World of Computers
• The Components of a Computer
• Advantages of Using Computers
• Disadvantages of Using Computers
• Computers in society
• Computer defined
• Computers for organizations
• Introduction to java programming
• Introduction to Programs
• Introduction to Java
• TicTacToe Applet
• SelfTest Website
• Transforming data
• Number systems
• Computers represent data
• Java How to Program
• Assembly languages
• Hight level languages
• Introduction to object technology
• Typecal java development environtment
• Bài giảng Nhập môn tin học
• Nhập môn tin học
• Data processing
• Characteristic features of computers
• Computers evolution to their present form
• Computers generations
• Introduction to Computing
• Fundamental Concepts
• Computer History
• Analogue Computers
• First Digital Computers
• Today’s Computers
• Information processing cycle
• Computer hardware
• Software runs the machine
• Internet’s history
• World Wide Web
• Search techniques
• E mail addresses
• File Transfer Protocol
• Internet Relay Chat
• The keyboard
• Input device
• Mechanical mouse
• Inputting data
• Devices for the hand
• Optical input devices
• Audiovisual input devices
• Output device
• Video card
• Cathode Ray Tube
• Electronic magnetic fields
• Impact printers
• High quality printers
• Ink jet printers
• Modern CPUs
• Microcomputer processors
• Advanced micro devices
• Storage devices
• Categorizing storage devices
• Magnetic storage devices
• Improving drive perform ance
• Average access time
• Data transfer rate
• Operating system
• User interface
• Managing hardware
• Network operating systems
• PC operating systems
• Embedded operating systems
• Productivity software
• Acquiring software
• Word processing programs
• Graphics file formats
• Multimedia basics
• Graphics software
• Hybrid networks
• Sharing data
• Local Area Network
• Online world
• Internet through wires
• Internet wirelessly
• Consumer level
• Business level