Chapter 9 Communications And Networks

Chapter 9 Communications and Networks

Chapter 9 Objectives Define the components required for successful communications Identify various sending and receiving devices Explain communications applications List advantages of using a network Differentiate between a local area network and a wide area network Understand the various communications technologies Identify uses of intranets and extranets Explain the purpose of communications software Understand the telephone network Describe commonly used communications devices Identify various physical and wireless transmission media p.9.2 Next

Communications ,[object Object],[object Object],p.9.2 Fig. 9-1 Next ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],a a d c b e a a f c

Communications ,[object Object],p.9.2 Next sending device Initiates an instruction to transmit data, instructions, or information communications device Converts or formats the data, instructions, or information from the sending device into signals carried by a communications channel communications channel A path on which the signals travel communications device Receives the signals from the communications channel and converts or formats them so the receiving device can understand the signals receiving device Accepts the data, instructions, or information

Communications ,[object Object],[object Object],p.9.3 Fig. 9-2 Next analog signal A continuous electrical wave digital signal Individual electrical pulses that represent the bits grouped together into bytes

Sending and Receiving Devices ,[object Object],[object Object],p.9.3 mainframe computers mid-range servers desktop computers notebook computers Next Internet appliances and Web-enabled devices

Sending and Receiving Devices ,[object Object],p.9.3 Fig. 9-3 Next Internet appliance Also called a Web appliance Computer with limited functionality whose main purpose is to connect to the Internet from home Web-enabled device Handheld device that provides access to the Internet and e-mail from any location Internet appliance Web-enabled cellular telephone Web-enabled handheld computer set-top box

Uses of Communications Technologies ,[object Object],[object Object],p.9.4 Next voice mail fax e-mail instant messaging chat rooms newsgroups telephony videoconferencing collaboration groupware global positioning system (GPS)

Uses of Communications Technologies ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.4 Next

Uses of Communications Technologies ,[object Object],[object Object],[object Object],[object Object],p.9.5 Next

Uses of Communications Technologies ,[object Object],[object Object],[object Object],p.9.5 Next

Uses of Communications Technologies ,[object Object],[object Object],Step 4: Your instant message travels through a messaging server and then to the online buddy. Step 2: Server checks if any of your established friends, family, or co-workers, called buddies, are online. Step 3: You send instant messages to an online buddy. p.9.6 Fig. 9-4 Step 1 Step 2 IM server Step 1 Step 2 Step 3 IM server Next Step 1 Step 2 Step 4 Step 3 IM server messaging server Step 1: Login to the IM server. Step 1 IM server

Uses of Communications Technologies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],p.9.6 Fig. 9-5 Next

Uses of Communications Technologies ,[object Object],[object Object],[object Object],[object Object],p.9.7 Next synchronous real-time live communications asynchronous communications that are not real time

Uses of Communications Technologies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],p.9.8 Next

Uses of Communications Technologies ,[object Object],[object Object],[object Object],p.9.8 Fig. 9-6 Next

Uses of Communications Technologies ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.8 Fig. 9-6 Next

[object Object],[object Object],[object Object],[object Object],[object Object],Uses of Communications Technologies ,[object Object],p.9.9 Fig. 9-7 Start Net Meeting command Next NetMeeting window Word document chat room

Uses of Communications Technologies ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.10 Next manage projects communicate make group decisions schedule meetings

Uses of Communications Technologies ,[object Object],[object Object],p.9.10 Fig. 9-8 “ Where am I?” Step 1: GPS satellites orbit the earth. Every thousandth of a second, each satellite sends a signal that indicates its current position to the GPS receiver. Step 1 Next Step 2: A GPS receiver (such as in a car) determines its location on Earth by analyzing signals from the satellites. Step 2

Uses of Communications Technologies ,[object Object],[object Object],[object Object],[object Object],p.9.10 Next

Networks ,[object Object],[object Object],[object Object],p.9.11 Next share data and information facilitate communications share hardware share software

Networks ,[object Object],[object Object],[object Object],p.9.11 Next

Networks ,[object Object],[object Object],p.9.12 Fig. 9-9 Click to view Web Link then click LAN Next

Networks ,[object Object],[object Object],p.9.12 node node node node node Next Often the nodes are connected to the LAN via cables A wireless LAN (WLAN) is a LAN that uses no physical wires

Networks ,[object Object],[object Object],[object Object],p.9.12 Administration Adding, deleting, and organizing users and performing maintenance tasks File management Locating and transferring files Next Printer management Prioritizing print jobs and reports sent to specific printers on the network Security Monitoring and, when necessary, restricting access to network resources

Networks ,[object Object],[object Object],[object Object],p.9.12 Fig. 9-10 Next

Networks ,[object Object],[object Object],[object Object],[object Object],p.9.13 Fig. 9-11 Next printer may be used by all computers on network network operating system and application software installed on each computer

Networks ,[object Object],[object Object],p.9.14 Fig. 9-12 Next client client client server laser printer

Networks ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.14 ,[object Object],[object Object],[object Object],Next database server stores and provides access to a database network server manages network traffic print server manages printers and print jobs file server stores and manages files

Company on the Cutting Edge ,[object Object],[object Object],[object Object],p.9.14 Click to view Web Link then click Compaq Next

Networks ,[object Object],[object Object],[object Object],[object Object],p.9.15 Fig. 9-13 Click to view Web Link then click Wide Area Network communications satellite Next

Networks ,[object Object],[object Object],[object Object],p.9.16 Fig. 9-14 Next

Networks ,[object Object],[object Object],[object Object],p.9.14 Next

Networks ,[object Object],[object Object],[object Object],p.9.16 Next ring star bus

Networks ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.17 Fig. 9-15 personal computer personal computer personal computer personal computer personal computer Next

Networks ,[object Object],[object Object],[object Object],[object Object],p.9.16 Fig. 9-16 Next

Networks ,[object Object],[object Object],[object Object],[object Object],p.9.17 Fig. 9-17 host computer printer file server personal computer personal computer personal computer personal computer Next

Networks ,[object Object],[object Object],p.9.18 Next Ethernet token ring TCP/IP WAP

Technology Trailblazer ,[object Object],[object Object],[object Object],[object Object],[object Object],p.919 Click to view Web Link then click Robert Metcalfe Next

Company on the Cutting Edge ,[object Object],[object Object],[object Object],[object Object],p.9.19 Click to view Web Link then click Sun Microsystems Next

Networks ,[object Object],[object Object],[object Object],[object Object],p.9.19 Click to view Web Link then click Ethernet original Ethernet standard not very fast by today’s standards, but works well for small to medium networks Next Fast Ethernet transmits data and information at speeds up to 10 times faster than the original standard Gigabit Ethernet provides an even higher speed of transmission, with speeds up to 10 times faster than Fast Ethernet

Networks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],p.9.19 Next

Networks ,[object Object],[object Object],[object Object],[object Object],p.9.19 Click to view Web Link then click TCP/IP Next packets Data is divided into small pieces called packets routers Devices that direct packets along the fastest available path packet switching Technique of breaking a message into packets, sending the packets, and then reassembling the data

Networks ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.20 Next

Networks ,[object Object],[object Object],[object Object],[object Object],p.9.20 Next uses TCP/IP technologies has a Web server supports multimedia Web pages coded in HTML accessible via a Web browser users can post and update information on the intranet by creating and posting a Web page

Networks ,[object Object],[object Object],p.9.20 Fig. 9-18 Next

Networks ,[object Object],[object Object],p.9.20 Fig. 9-19 personal computer personal computer personal computer personal computer personal computer personal computer personal computer printer firewall corporate network Internet Next

Networks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],p.9.22 Fig. 9-20 Click to view Web Link then click Home Networks Next

Networks ,[object Object],p.9.22 Ethernet network Requires you to connect a cable to each computer Next HomePLC (powerline cable) network Uses the same lines that bring electricity and power into your home Plug one end of a cable into the computer's parallel port and the other into a wall outlet Phoneline network Uses existing telephone lines Connect one end of a cable in the computer and the other end into a telephone jack Does not interfere with voice and data transmissions on the telephone lines HomeRF (radio frequency) network Uses radio waves, instead of cables, to transmit data

Networks ,[object Object],[object Object],p.9.23 Next

Communications Software ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.23 Next

[object Object],Communications Software ,[object Object],p.9.23 Fig. 9-21 Step 1: Start the Internet Connection Wizard. Step 2: Enter the telephone number of your ISP. Step 3: Enter user name and password to log on to the ISP. Step 4: Type the connection name to display on your desktop. Step 5: Click the Finish button to establish Internet connection. Next

Communications Software ,[object Object],[object Object],p.9.24 Fig. 9-22 Next

Communications Software ,[object Object],[object Object],[object Object],[object Object],p.9.24 Fig. 9-23 Click to view Web Link then click FTP Programs FTP logon information Next connection established files on your computer files on the FTP server

The Telephone Network ,[object Object],[object Object],p.9.25 Fig. 9-24 satellite Click to view animation Next most of the PSTN uses digital technology analog signal analog signal final link from local telephone company to home or office

The Telephone Network ,[object Object],[object Object],[object Object],[object Object],p.9.25 Disadvantage Cannot control the quality of the connection because the telephone company’s switching office randomly selects the line Next Advantages Costs no more than making a regular call Computers at any two locations can establish a connection using modems and the telephone network

The Telephone Network ,[object Object],[object Object],[object Object],p.9.25 Next Can be analog or digital Digital lines transmit data and information at faster rates than analog lines

The Telephone Network ,[object Object],[object Object],[object Object],[object Object],p.9.26 bits per second (bps) Next kilobits per second (Kbps) megabits per second (Mbps) gigabits per second (Gbps)

The Telephone Network ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.26 Fig. 9-25 Next

The Telephone Network ,[object Object],[object Object],[object Object],[object Object],p.9.26 Next Both ends require an ISDN modem Faster and clearer connections than standard telephone connections

The Telephone Network ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],p.9.26 Fig. 9-26 Click to view Web Link then click DSL Next

[object Object],[object Object],[object Object],[object Object],[object Object],The Telephone Network p.9.27 Next T3 line 28 times faster than T1 Used for the Internet backbone T1 line Most popular

The Telephone Network ,[object Object],[object Object],[object Object],p.9.27 the Internet Next telephone networks other networks with large amounts of traffic

Communications Devices ,[object Object],[object Object],[object Object],p.9.27 Next dial-up modems ISDN and DSL modems cable modems network interface cards

Communications Devices ,[object Object],[object Object],[object Object],p.9.28 Click to view Web Link then click Modems Next mo dulate To change into an analog signal dem odulate To convert an analog signal into a digital signal mo + dem

Communications Devices ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],p.9.28 Fig. 9-27 Next

Communications Devices ,[object Object],[object Object],p.9.28 DSL modem Sends and receives digital data and information to a DSL line Next ISDN modem Also called an ISDN adapter Sends and receives digital data and information from your computer to an ISDN line

Communications Devices ,[object Object],[object Object],[object Object],[object Object],p.9.29 Fig. 9-28 Click to view Web Link then click Cable Modems Next

Communications Devices ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.29 Fig. 9-29 Click to view Web Link then click Network Interface Cards NIC for desktop computer NIC for notebook computer Next

Communications Devices ,[object Object],[object Object],p.9.30 Fig. 9-30 Next

Communications Channel ,[object Object],[object Object],p.9.31 Click to view Web Link then click Bandwidth Bandwidth Width of the communications channel The higher the bandwidth, the more data and information the channel can transmit Next Transmission media Materials or techniques capable of carrying one or more signals When you send data from your computer to another device, the signal carrying the data most likely travels over a variety of transmission media

Communications Channel ,[object Object],p.9.31 Fig. 9-31 Step 1: Sending device requests information using either a physical transmission media or a wireless transmission media. sending device modem ISP microwave station Step 2: When the request leaves the ISP, it travels over T1 lines, microwave stations, earth-based stations, and communications satellites until it reaches the Internet backbone. mainframe computer T1 lines earth-based stations communications satellite T1 lines Next Step 3: The request travels over T3 lines along the Internet backbone. T3 lines mainframe computer T3 lines Internet backbone Step 4: The request travels over T1 lines until it reaches the destination network server. T1 lines destination network server

Communications Channel ,[object Object],p.9.32 Next ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Physical Transmission Media ,[object Object],[object Object],p.9.32 Fig. 9-32 Next

Physical Transmission Media ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.33 Fig. 9-33 twisted pair cable twisted pair cable twisted pair wire Next

Physical Transmission Media ,[object Object],[object Object],[object Object],[object Object],p.9.33 Fig. 9-34 coaxial cable plastic outer coating woven or braided metal insulating material copper wire Next

Physical Transmission Media ,[object Object],[object Object],[object Object],[object Object],[object Object],p.9.34 Fig. 9-35 fiber-optic cable between floors of a building cable contains many optical fibers outer covering jacket Next protective coating glass cladding optical fiber core

Physical Transmission Media ,[object Object],p.9.34 Next ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Wireless Transmission Media ,[object Object],[object Object],[object Object],p.9.34 Fig. 9-36 Click to view video Next

Wireless Transmission Media ,[object Object],[object Object],[object Object],p.9.35 transmitter sends the broadcast radio signal Next receiver accepts the broadcast radio signal must have an antenna that is located in the range of the signal transceiver both sends and receives signals from wireless devices

Wireless Transmission Media ,[object Object],[object Object],[object Object],p.9.35 Fig. 9-37 Step 1: A customer buys a movie ticket over the Web and downloads it to a handheld computer. Step 1 Step 2 Step 2: The handheld computer stores a “proof-of-purchase voucher.” Step 3 Step 3: A Bluetooth™-enabled reader scans the voucher. Next Step 4: The customer is admitted to the movie theatre. Step 4

Wireless Transmission Media ,[object Object],p.9.36 Fig. 9-38 switch access point Next

Wireless Transmission Media ,[object Object],[object Object],[object Object],p.9.36 Fig. 9-39 mobile telephone switching office (MTSO) cell cell cell cell calling party in auto called party public switched telephone network base station (microwave station) Next

Wireless Transmission Media ,[object Object],[object Object],[object Object],[object Object],p.9.37 Next

Wireless Transmission Media ,[object Object],[object Object],[object Object],p.9.38 Fig. 9-40 Next

Wireless Transmission Media ,[object Object],[object Object],[object Object],[object Object],p.9.38 Fig. 9-40 Next

Wireless Transmission Media ,[object Object],[object Object],[object Object],[object Object],p.9.38 Fig. 9-41 Click to view video Next

Wireless Transmission Media ,[object Object],[object Object],[object Object],[object Object],p.9.39 Fig. 9-42 Click to view video Next

Summary of Communications and Networks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Chapter 9 Communications And Networks

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Chapter 9 Communications And Networks