ers. One potential implementa- tion of this is the personal area network (PAN). To get a sense of how a PAN would work, imagine walking down the street with a cell phone at your waist, a laptop in your briefcase in sleep mode, and an electronic wallet in your back pocket. You are wearing a headset and listening to MP3 music. If someone sends you an e-mail, it arrives over your cell phone. Your cell phone wakes up your computer and deposits the e-mail onto the hard drive. If the message is marked urgent, then it beeps your MP3 player and tells you that you have important e-mail. Then a new song you ordered is released. The song is downloaded over your cell phone to your MP3 player so that you can listen to it, and your electronic wallet is debited for the cost of the order. In this way, Bluetooth would allow all your electronic devices to talk to one another, to any other nearby Blue- tooth device, and through your cell phone to any other electronic device on the Inter- net. The Bluetooth consortium certainly would like it if every third-generation (3G) telephone contained a Bluetooth chip, but it is too early to say if this will happen. How- ever, with Ericsson, a major cell phone manufacturer, as a key member of the Bluetooth consortium, it certainly seems possible. It is fair to say that given the cost of data service, demand for high speed digital data services will remain mostly in the private sector for some time. However, this demand may not be concentrated in the Fortune 1000 and other major companies. There are Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. The User Terminal Key Radio Concepts three reasons wireless data may have a broader subscriber base. First of all, cellular service providers and third-party providers relying on cellular networks are building turnkey prepackaged services and wooing small and medium-sized busines