Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Most thorough+technically detailed book available for SONET

This text serves as an excellent reference as well as introduction to SONET/SDH. It is the most thorough and technically detailed book available on the topic matter. The author clearly is an expert in the field. Only area of improvement would be in the editting - however, despite this, the book is a "must-own" for anyone requiring or desiring knowledge of SONET/SDH. Would highly recommend it.