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 Identify three major types of network cabling and of wireless network technologies  Decide what kinds of cabling and connections are appropriate for particular network environments  Describe wireless transmission technologies used in LANs  Describe signaling technologies for mobile computing Copyright © Texas Education Agency, All rights reserved.

 More expensive than cable-based networks  Wireless networking technologies are used for  Ready access to data for mobile professionals  Improved customer services in busy areas  Network connectivity in facilities where in-wall wiring would be impossible or too expensive  Home networks Copyright © Texas Education Agency, All rights reserved.

 Three primary categories of wireless networks:  Local area networks (LANs)  Extended LANs  Mobile computing  Often involves third-party communication carrier that supplies transmission and reception facilities Copyright © Texas Education Agency, All rights reserved.

 Wireless LANs have similar components to wired counterparts  Network interface attaches to antenna and emitter rather than cable  Transceiver or access point translates between wired and wireless networks  Some wireless LANs attach computers to wired network by using small individual transceivers  May be wall-mounted or freestanding Copyright © Texas Education Agency, All rights reserved.

 Infrared light beams send signals between pairs of devices, using high bandwidth  Four kinds of infrared LANs include:  Line-of-sight networks require unobstructed view between transmitter and receiver  Reflective wireless networks broadcast signals to central hub and then forward them to recipients  Scatter infrared networks bounce signals off walls and ceilings  Broadband optical telepoint networks offers high speed and wide bandwidth Copyright © Texas Education Agency, All rights reserved.

 IEEE Wireless Networking Standard resulted in inexpensive, reliable, wireless LANs for homes and businesses  b standard provides bandwidth of 11 Mbps at frequency of 2.4 GHz  a standard provides bandwidth of 54 Mbps at 5 GHz frequency  g, to be ratified in 2003, will operate at 54 Mbps at frequency of 2.4 GHz Copyright © Texas Education Agency, All rights reserved.

 IEEE b Wireless Networking Standard continues to evolve with higher-speed enhancements  Cellular packet radio by Metricom Inc. offers wireless networking in three areas of US  Allows users to establishes 2 Mbps connections  Cellular Digital Packet Data (CDPA) is available in major US metropolitan areas  Allow connections at 19.2 Kbps Copyright © Texas Education Agency, All rights reserved.

 Wireless networking equipment can extend LANs beyond their normal cable-based distance limitations  Wireless bridges connect networks up to three miles apart using line-of-sight or broadcast transmissions  Up-front expense may be 10 times higher, but no monthly carrier service charge  Longer-range wireless bridges work at distances up to 25 miles using spread-spectrum transmissions Copyright © Texas Education Agency, All rights reserved.

 Wireless bridge can extend LANs with short-range bridges spanning three miles and long-range wireless bridges spanning up to 25 miles  The b wireless standard specifies bandwidth of 11 Mbps  Two new standards, a and g, support bandwidths up to 54 Mbps Copyright © Texas Education Agency, All rights reserved.

 Mobile computing uses broadcast frequencies and communications carriers to transmit and receive signals using packet-radio, cellular, or satellite techniques  Wireless networking is expected to grow significantly with newer and more powerful techniques and standards Copyright © Texas Education Agency, All rights reserved.