Not very useful for somebody thrown into the job of managing telecomm equipment. Some good tips, and deciphering of lingo.I learned more by just doing the job, and learning from the support services company (Black Box,) than I did from reading this book.The author goes to places that the average telecomm manager does not need to go. A more useful book would discuss interfaces to the various kinds of switches that the manager might find in the US.Not a complete waste of money, but very close to it...