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Electromagnetic waves have been transmitted to convey signals literally since the inception of radio Unguided media is a phrase used to cover all transmission media not guided by wire, fiber, or other constraints; it includes radio frequency (RF), infrared (IR), and microwave methods Unguided media have one attribute in common: they are unguided and as such can travel to many machines simultaneously Transmission patterns can be modulated by antennas, but the target machine can be one of many in a reception zone As such, security principles are even more critical, as they must assume that unauthorized users have access to the signal
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Infrared (IR) is a band of electromagnetic energy just beyond the red end of the visible color spectrum IR has been used in remote control devices for years, and it cannot penetrate walls but instead bounces off them IR made its debut in computer networking as a wireless method to connect to printers Now that wireless keyboards, wireless mice, and PDAs exchange data via IR, it seems to be everywhere IR can also be used to connect devices in a network configuration, but it is slow compared to other wireless technologies It also suffers from not being able to penetrate solid objects, so stack a few items in front of the transceiver and the signal is lost
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The use of radio frequency (RF) waves to carry communication signals goes back to the beginning of the twentieth century RF waves are a common method of communicating in a wireless world They use a variety of frequency bands, each with special characteristics The term microwave is used to describe a specific portion of the RF spectrum that is used for communication as well as other tasks, such as cooking Point-to-point microwave links have been installed by many network providers to carry communications over long distances and rough terrain Microwave communications of telephone conversations were the basis for forming the telecommunication company MCI Many different frequencies are used in the microwave bands for many different purposes Today, home users can use wireless networking throughout their house and enable laptops to surf the Web while they move around the house Corporate users are experiencing the same phenomenon, with wireless networking enabling corporate users to check e-mail on laptops while riding a shuttle bus on a business campus These wireless solutions are covered in detail in 10 One key feature of microwave communications is that microwave RF energy can penetrate reasonable amounts of building structure This allows you to connect network devices in separate rooms, and it can remove the constraints on equipment location imposed by fixed wiring Another key feature is broadcast capability By its nature, RF energy is unguided and can be received by multiple users simultaneously Microwaves allow multiple users access in a limited area, and microwave systems are seeing application as the last mile of the Internet in dense metropolitan areas Point-to-multipoint microwave devices can deliver data communication to all the business users in a downtown metropolitan area through rooftop antennas, reducing the need for expensive building-to-building cables Just as microwaves carry cell phone and other data communications, the same technologies offer a method to bridge the last-mile solution The last mile problem is the connection of individual consumers to a backbone, an expensive proposition because of the sheer number of connections and unshared lines at this point in a network Again, cost is an issue, as transceiving equipment is expensive, but in densely populated areas, such as apartments and office buildings in metropolitan areas, the user density can help defray individual costs Speed on commercial microwave links can exceed 10 Gbps, so speed is not a problem for connecting multiple users or for high-bandwidth applications PART III
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