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anytime, regardless of the characteristics of the loop. Ubiquitous access may include wireless as an option, but may also include wired solutions such as Ethernet, T1, and DSL. Another issue is the usage of the two words in terms of parts of speech. Mobility, used as it is in our lexicon, is a noun, because in the minds of many it defines (incorrectly) an application. Mobility is no more an application than DSL is an application. It is a technology option no more and no less. Ubiquity, on the other hand, is used as an adjectival modifier to qualify the nature of an individual s access to the network. Ubiquitous access implies the delivery of something that is superior because it is everywhere. But isn t wireline access universally available and, therefore, ubiquitous as well And isn t it significantly more secure than a wireless connection, particularly in an enterprise application After all, if a business decides to implement wireless (802.11) as its connectivity option of choice within a workplace, how can it possibly guarantee that (1) all users implement a secure wireless protocol over the local loop, and (2) signals do not leak out of the building Wireless is a great technology, offering freedom and mobility to users, but there is a price. And that price can be steep if it is implemented without forethought. I have observed in this book that customers are not really looking for the next great killer application but rather for a killer way to access existing applications, because those applications offer solutions to most of the challenges that users encounter. Consider the typical business user. As long as they are in their home office environment, wired connectivity is perfectly acceptable for both voice and data. When they leave the office and get in the car, mobile telephony becomes important. Mobile data has no application (thankfully!) in the car other than for those applications optimized for that environment OnStar service, for example, or GPS-based guidance systems, or specific applications related to public safety. If, however, the user stops at Starbucks for coffee before going home and decides to check e-mail one last time, ubiquitous connectivity, whether wired or wireless, provides value to the user from a data perspective, while mobile telephony remains valuable for voice. An RJ-45 connection on the tabletop is just as serviceable as a Wi-Fi connection, not to mention far more secure and predictable. The bottom line is this. Mobility defines the characteristics of a lifestyle choice that involves networking, whether personal or workrelated, while ubiquity defines the characteristics of the technology infrastructure required to support the mobile lifestyle. Anywhere, anytime connectivity has become the mantra of the mobile user, and while wire-
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less (Wi-Fi) is the most loudly proclaimed option, it is not the only option. This, I believe, is part of the reason that revenues associated with Wi-Fi remain elusive. It is sexy, cool, and functional. But of those three characteristics the only one that has revenue potentially associated with it is functional, and there are too many alternatives to wireless that offer lower cost, greater security, and more predictable connections. Until a service provider comes up with a compelling argument for Wi-Fi s performance superiority, the only companies that will make money on it will be those building wireless access points and routers.
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In April 2002, the IEEE published their 802.16 standard for broadband wireless access (BWA), also known as WiMAX. 802.16 specifies the details of the air interfaces for wireless metropolitan area networks (MANs). And while there are some similarities between Wi-Fi and WiMAX, in other respects they could not be more different. First of all, WiMAX was not created as a goat trail technology. Instead, developers first quietly created standards that were socialized through other standards bodies such as the ITU-TSS. As a result of this strategy, spectrum was allocated globally for 802.16 implementation through a 2-year, open-consensus procedure that involved hundreds of engineers from major operators and vendors around the world. Consequently, 802.16, while still a nascent technology, enjoys global acceptance and what will be a relatively trivial implementation phase once it becomes more widely deployed. Furthermore, the capabilities of the standard are impressive. Whereas Wi-Fi offers megabits of nominal bandwidth over service distances of 300 feet, WiMAX offers 100 Mbps over a service radius of several miles. And because it is orthogonal, it does not require line of sight for connectivity. 802.16 is initially targeted at the first mile challenge for metropolitan area networks. It operates between 10 and 66 GHz (the 2 to 11 GHz spectrum with point-to-multipoint and optional mesh topologies) and defines a MAC layer that supports multiple physical layer specifications specific to each frequency band. The 10 to 66 GHz standard supports two-way transmission options at a variety of frequencies
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