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Presentation transcript:

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 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 V.92 is the current modem standard Several modem types Internal External Voice Fax 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 V.92, suggest to your students to purchase a V.90 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 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

Digital Data Connections Broadband connection Any data connection faster than 56 Kbps Common in business Becoming popular in home installations

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

ISDN Connection

Digital Data Connections T lines High-capacity voice/data lines Used to control phone and data Several variants T1 transmits at 1.544 Mbps T3 transmits at 44.736 Mbps Teaching tip More information on T lines can be found at ckp.made-it.com/t1234.html.

Digital Data Connections DSL technologies Digital Subscriber Line Popular with home users Speeds range from 100 Kbps to 30 Mbps Asymmetrical DSL (ADSL) Upload speed slower than download speed Symmetrical DSL (SDSL) Requires a DSL modem Teaching tip The website www.dslreports.com provides unbiased information regarding DSL providers.

Digital Data Connections Cable modem connections Popular with home and office users Speeds between 1 and 3 Mbps Requires a cable modem

Digital Data Connections ATM Asynchronous Transfer Mode Efficient transfer of video and sound Requires a special NIC and hardware

Wireless Networks Benefits No cable to pull Mobile devices access network resources Mobility and flexibility for office workers Discussion point Wireless networks have drawbacks. Direct your students to discover some of these drawbacks including security, speed and complexity.

Wireless Networks Wireless 802.11 Also called Wi-Fi IEEE standard Institute of Electronic and Electrical Engineers Several versions 802.11b connects up to 11Mbps 802.11g connects up to 56Mbps Use the same type of devices

Wireless Networks Wireless Access Point Center of a wireless network WAPS combined cover a larger area Distance to WAP determines bandwidth Range is 50 to 150 meters Extension points can extend range

Wireless Networks Wireless Adapters Used by devices to connect Includes signal strength software Teaching tip Spend a little time here describing a home solution to share a broadband connection using a wireless solution. Describe products, security concerns and WAP placement.

Chapter 9B End of Chapter