I really enjoyed this book, especially the anecdotes in the introduction, but I can't realy see alot of applications for a "crash-course" that is this long. There are many situations I can envision where someone would need to learn about telecom networks quickly, but they probably wouldn't need to know many of the intricacies that Shepard deals with and they almost certainly wouldn't be interested in his anecdotes and discussion of undersea cable laying.
However, I don't know of any other comprehensive book like this so it may be your only option. Either way I certainly enjoyed reading it and intend to buy his other books, but to read at my leisure.