Use the following chart to discuss the advantages and disadvantages of various types of wireless network links: Communications Link Advantages Disadvantages Radio waves Longer range; does not Before you can use a require line-of-sight frequency for transmission communication, it must be licensed from the FCC Infrared transmissions An FCC license is not transmission range; required requires line-of-sight transmission Microwave Long range; can be aimed in Microwaves cannot transmissions one direction; has higher penetrate metal; requires capacity when compared to line-of-sight transmission; radio waves microwave stations cannot be more than 25 or 30 miles apart Satellite links A GEO satellite provides A GEO satellite requires a continuous coverage over a delay of 24 seconds to particular area; an LEO transmit data; an LEO satellite offers transmission satellite requires a web of delays of only a few satellites hundredths of a second List the advantages and disadvantages of wireless networks. Explain that Wi-Fi specifies the hardware, the type of transmission medium, and the transmission speed. FIGURES Figure 5-25, Figure 5-26 TEACHER TIP Most students will be familiar with the use of radio waves for data communication. Students also may be familiar with satellite transmission if they have used a GPS system. However, many will not be familiar with the use of infrared transmissions, even though they use some infrared devices, such as television remote controls. Discuss examples of each of these technologies. CLASSROOM ACTIVITIES Class Discussion: If your building has a wireless network, ask the class if they use it. Is it reliable? Quick Quiz: Most wireless networks transport data using which type of signal? (Answer: RF) True/False: Infrared light can be used to carry data signals, but only for short distances and between devices with clear line of sight. (Answer: True) True/False: Workstations, peripheral devices, and network devices can be equipped with transceivers to send and receive data on wireless networks. (Answer: True)
Use the following chart to discuss the advantages and disadvantages of various types of wireless network links: Communications Link Advantages Disadvantages Radio waves Longer range; does not require line-of-sight transmission Before you can use a frequency for communication, it must be licensed from the FCC Infrared transmissions An FCC license is not required transmission range; requires line-of-sight transmission Microwave transmissions Long range; can be aimed in one direction; has higher capacity when compared to radio waves Microwaves cannot penetrate metal; requires line-of-sight transmission; microwave stations cannot be more than 25 or 30 miles apart Satellite links A GEO satellite provides continuous coverage over a particular area; an LEO satellite offers transmission delays of only a few hundredths of a second A GEO satellite requires a delay of 24 seconds to transmit data; an LEO satellite requires a web of satellites List the advantages and disadvantages of wireless networks. Explain that Wi-Fi specifies the hardware, the type of transmission medium, and the transmission speed. FIGURES Figure 5-25, Figure 5-26 TEACHER TIP Most students will be familiar with the use of radio waves for data communication. Students also may be familiar with satellite transmission if they have used a GPS system. However, many will not be familiar with the use of infrared transmissions, even though they use some infrared devices, such as television remote controls. Discuss examples of each of these technologies. CLASSROOM ACTIVITIES Class Discussion: If your building has a wireless network, ask the class if they use it. Is it reliable? Quick Quiz: Most wireless networks transport data using which type of signal? (Answer: RF) True/False: Infrared light can be used to carry data signals, but only for short distances and between devices with clear line of sight. (Answer: True) True/False: Workstations, peripheral devices, and network devices can be equipped with transceivers to send and receive data on wireless networks. (Answer: True)
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