Chapter 16 (End-Of-Chapter_Application-Questions 1)

Solution for BUSN 7 7th Edition Chapter 16, Problem 1

by Marcella Kelly, Chuck Williams
408 Solutions 40 Chapters 44738 Studied ISBN: 9781305436848 Management 5 (1)

Chapter 16, Problem End-Of-Chapter_Application-Questions 1 : 1. The rapid rise of cell phones, wireless...

1. The rapid rise of cell phones, wireless Internet connections and other technologies has given rise to concerns that we may be running out of bandwidth (capacity) in the radio wave end of the electromagnetic spectrum currently used to transmit data wirelessly. But a new approach may create a “brighter” future for information and communications technologies. The new approach is called Li-Fi, and some experts are predicting that it will soon replace Wi-Fi as the method of choice for moving data. Use the Internet to do some research on Li-Fi. How does this technology work? What are its advantages? Does it have any important drawbacks? Do you think this technology will be successful? Why or why not? [A good place to start is a TED lecture by leading Li-Fi proponent Harald Haas.]


Step-By-Step Solution

1.Li-Fi technology uses extremely rapid variations in the intensity of light emitted from LED light bulbs to transmit data to specially designed receivers. These variations in intensity occur so rapidly that the human eye does not notice them, so the light looks just like the illumination coming from an ordinary LED bulb. Li-Fi is still in the development phase, but it is more than just a theory—prototypes have already transmitted data at rates in excess of 10 megabits per second—on par with a relatively fast broadband connection.

Li-Fi provides several advantages over today’s wireless technology. The visible light spectrum is much broader than the radio spectrum, so Li-Fi offers greater capacity. Li-Fi can also be used in many situations where Wi-Fi either doesn’t work or cannot be used. For example, Li-Fi can be used on airplanes and in hospitals where wireless connections must be turned off. It can even be used underwater. Some experts predict that headlights and taillights of automobiles and stoplights could all serve as Li-Fi transmitters, making it possible for cars to communicate with each other and with the traffic grid as a whole. This could reduce traffic accidents and improve the flow of traffic. Li-Fi also has some security advantages; unlike wireless signals, Li-Fi signals cannot penetrate through walls, so they can’t be intercepted by people in other rooms or outside of the building. Finally, Li-Fi has the potential to be more efficient and cheaper than Wi-Fi. In a sense, the data transmission is free, since it is a byproduct of the light provided by the LED bulb.

The biggest drawbacks of Li-Fi technology are that it requires line-of-sight transmission; it can’t penetrate through walls or other barriers. (Of course, as mentioned above, this is also an advantage when it comes to preventing the information from being intercepted.) Another drawback of Li-Fi technology is that it doesn’t work with old-fashioned incandescent bulbs since they can’t vary their intensity quickly enough to transmit data. (Of course, the Energy Independence and Security Act of 2007 calls for the phase out of incandescent bulbs and their replacement with more efficient light sources such as LED.) The upfront cost of LED bulbs is much higher than the cost of incandescent lights, so adoption of this light source may be slow. (However, LED lights are much cheaper to operate and last much longer than incandescent lights, so they actually save consumers money in the long run.)

While this technology is still in its infancy and problems remain to be solved, it appears to have great promise. Many experts see a “bright” future for Li-Fi.


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