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Chapter 8 Communications & Networks
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Objectives Overview
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Objectives Overview
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Communications
• Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information
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Communications
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Uses of Computer Communications
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Uses of Computer Communications
• Users can send and receive wireless messages using wireless messaging services
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Uses of Computer Communications
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Uses of Computer Communications
• Wireless Internet access points allow people to connect wirelessly to the Internet from home, work, school, and in many public locations
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Uses of Computer Communications
• A cybercafé is a coffeehouse, restaurant, or other location that provides personal computers with Internet access to its customers
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Uses of Computer Communications
• A global positioning system (GPS) is a navigation system that consists of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the GPS receiver’s geographic location
• GPS receivers are:
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Uses of Computer Communications
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Uses of Computer Communications
• Collaboration software includes tools that enable users to share documents via online meetings and communicate with other connected users
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Uses of Computer Communications
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Uses of Computer Communications
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Uses of Computer Communications
• Web services enable programmers to create applications that communicate with other remote computers over the Internet or on an internal business network
• A mashup is a Web application that combines services from two or more sources
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Networks
• A network is a collection of computers and devices connected together via communications devices and transmission media
• Advantages of a network include:
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Networks
• A local area network (LAN) is a network that connects computers and devices in a limited geographical area
• A wireless LAN (WLAN) is a LAN that uses no physical wires
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Networks
• A metropolitan area network (MAN) connects LANs in a metropolitan area
• A wide area network (WAN) is a network that covers a large geographical area
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Networks
• The design of computers, devices, and media on a network is sometimes called the network architecture
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Peer-to-peer networkClient/server network
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Networks
• P2P describes an Internet network on which users access each other’s hard disks and exchange files directly over the Internet
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Networks
• A network topology refers to the layout of the computers and devices in a communications network
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Star network Bus network Ring network
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Networks
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Network Communications Standards
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Network Communications Standards
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Network Communications Standards
• Wi-Fi identifies any network based on the 802.11 standard that facilitates wireless communication
• Sometimes referred to as wireless Ethernet
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Network Communications Standards
• Bluetooth defines how two Bluetooth devices use short-range radio waves to transmit data
• UWB (ultra-wideband) specifies how two UWB devices use short-range radio waves to communicate at high speeds
• IrDA transmits data wirelessly via infrared (IR) light waves• RFID uses radio signals to communicate with a tag placed in
or attached to an object, animal, or person
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Network Communications Standards
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Communications Software
• Communications software consists of programs that:
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Communications Over the Telephone Network
• The public switched telephone network (PSTN) is the worldwide telephone system
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Communications Over the Telephone Network
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Communications Over the Telephone Network
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Communications Devices
• A communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device
• A dial-up modem converts signals between analog and digital
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Communications Devices
• A digital modem sends and receives data and information to and from a digital line
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Communications Devices
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Communications Devices
• A wireless modem uses the cell phone network to connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile device
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Communications Devices
• A network card enables a computer or device to access a network
• Available in a variety of styles
• Wireless network cards often have an antenna
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Communications Devices
• A wireless access point is a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network
• A router connects multiple computers or other routers together and transmits data to its correct destination on a network
• Many are protected by a hardware firewall
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Home Networks
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• Home networks provide computers with the following capabilities:
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Home Networks
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Communications Channel
• The amount of data that can travel over a communications channel sometimes is called the bandwidth
• Transmission media carries one or more signals
• Broadband media transmit multiple signals simultaneously
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Physical Transmission Media
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Twisted-pair cable
Coaxial cable
Fiber-optic cable
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Wireless Transmission Media
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Video: Got Your Video Right Here
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CLICK TO START
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Summary
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