Figure 5-1: Local wireless Technologies, Continued ·802.11 Wireless lans oday, mostly speeds of tens of megabits per second with distances of 30 to 100 meters or more Can serve many users in a home or office Increasingly, 100 Mbps to 600 Mbps with 802. 11n Organizations can provide coverage throughout a building or a university campus by installing many access points 5-6
5-6 Figure 5-1: Local Wireless Technologies, Continued • 802.11 Wireless LANs – Today, mostly speeds of tens of megabits per second with distances of 30 to 100 meters or more • Can serve many users in a home or office – Increasingly, 100 Mbps to 600 Mbps with 802.11n – Organizations can provide coverage throughout a building or a university campus by installing many access points
Test Your understanding Page 237 1d)e) 2 5-7
5-7 Test Your understanding • Page 237 • 1 d) e) • 2
Radio Propagation
Radio Propagation
Figure 5-5: Frequency Measurement Frequency Light waves are measured in wavelengths( Ch 3) Radio waves are measured in terms of frequency Measured in hertz(Hz)-the number of complete cycles per second 1 Second Two cycles in 1 second, so frequency is two Hertz(Hz) 5-9
5-9 Figure 5-5: Frequency Measurement • Frequency – Light waves are measured in wavelengths (Ch. 3) – Radio waves are measured in terms of frequency – Measured in hertz (Hz)—the number of complete cycles per second 1 Second Two cycles in 1 second, so frequency is two Hertz (Hz)
Figure 5-5: Frequency Measurement, Continued Measuring frequencies Frequency measures increases by factors of 1,000(not 1,024) Kilohertz( kHz) [Note the lower-case k MegahertZ(MHz) Gigahertz(GHz) 5-10
5-10 Figure 5-5: Frequency Measurement, Continued • Measuring Frequencies – Frequency measures increases by factors of 1,000 (not 1,024) – Kilohertz (kHz) [Note the lower-case k] – Megahertz (MHz) – Gigahertz (GHz)