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From Barnes & NobleThe Barnes & Noble Review
Think of Voice Over 802.11 as a mentor that leads the practitioner to new levels of expertise in the development of Wi-Fi telephony applications. Author Frank Ohrtman has written an excellent practical guide to the achievement of high-quality voice transmission in the latest and greatest applications out there.
The author begins with an overview of Vo802.11. He explains to the reader that in order to have an understanding of the public switched telephone network (PSTN) and how it is potentially going to be replaced, the reader must first have a good comprehension of its three major components: access, switching, and transport. Next, the author discusses how 802.11 works. Then he briefly outlines how VoIP functions. Ohrtman then continues by introducing the reader to switching, both for legacy time-division multiplexing (TDM) technologies and for VoIP. Next, he covers the science of antennas and how proper engineering can stretch the most modest resources to deliver essential services to the home. The author then turns to a discussion of basic 802.11 security and the known problems. He continues the discussion by covering how quality of service (QoS) can be optimized on an 802.11 network. Next, the author explains measures particular to voice that will deliver the best possible voice quality on a Vo802.11 network. Then he outlines scalability concerns that network planners should take into consideration when planning a Vo802.11 application. Ohrtman posits that a Vo802.11 solution is just as reliable (actually available) as legacy TDM solutions, and potentially even more reliable. Next, he provides an overview of how those features are delivered over a softswitched Vo802.11 network. Then the author explores the considerations wireless service providers should take into account when deploying Vo802.11 service on unlicensed 802.11 bands. Finally, Ohrtman looks at the economic aspects of Vo802.11 in the enterprise.
If your work takes you into the arena of Wi-Fi application development, you will want to have this very practical tutorial and reference at hand. This outstanding book is a must-have for telephony's absolute requirements for high quality and reliability. John R. Vacca
John R. Vacca, the former computer security official (CSO) for NASA's space station program (Freedom), has written nearly 40 books about advanced storage, computer security, and aerospace technology.