The best place to start on this book is the Table of Contents or Index if you want to key in on information about a specific topic. Not sure whether you have a dedicated circuit or what your local carrier’s responsibilities are? Chapter 1 can help you get your bearings.
Depending on the specific aspect of telecom you need to research, you may want to jump to Chapter 6 to find out about what’s going on with your phone bill, or if you’re experiencing a major malfunction right now, skip to Chapter 13 to figure out how to troubleshoot your dedicated circuit. This is your buffet of telecom goodies; check out the entire offering and dive into the sections you think are tasty.