William C. Hardy
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By: McGraw-Hill Professional
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Subjects -> Computers & Internet -> Networking -> Networks, Protocols & APIs -> General
Subjects -> Computers & Internet -> Networking -> Networks, Protocols & APIs -> General AAS
Subjects -> Computers & Internet -> Networking -> Telephony
Customer Reviews:
Total reviews: 2
Average rating: 3.0 of 5
More touchy-feely than a bowl of peeled grapes 1 out of 5 stars.
7 of 7 people found this review helpful.
I bought this book because I was looking for an objective means to evaluate the quality of voice, and moreover, i was thinking that the topics in this book could be transplanted to a new application, e.g. how to evaluate the TCP transport quality in an underlying network, which is the subject of my new job.As a reference, this book stinks. The author will not define the "voice envelope" where if you stay within the envelope users will have a hard time perceiving a loss in quality. For example, this book is touted as useful to VoIP Network Architects, but the book gives absolutely no guidance as to what is an acceptable (or unacceptable) level of delay in a VoIP phone system.
Instead, the author wastes 309 pages and about .01% of a perfectly good tree, to say, basically, "nobody can evaluate voice quality without running a side-by-side experiment between two systems." Its a wonder that someone can publish 309 pages of this drivil with one conclusion for his entire work. Oh, I forgot, the author fills up the book with 67 pages that are wasted in his bragging about all his patents, when he filed them, and what each and every last patent was about. If that isn't vanity publishing, I don't know what is.
Editorial Review:
VoIP is the next big advance in telecommunications, but it is exceptionally hard to implement. The very things that make our telephones so comfortable to use - instant connections, strong clear signals, and no downtime - are the things data networks sacrificed for speed and flexibility. As we begin to replace traditional phone service with voice over data networks, quality assurance has to be re-invented. Telecom managers didn't design VoIP, but they're the ones responsible for quality and they have to come up to speed fast on the measurements, tools, and utilities in the IP environment that can help to get the job done.