This book investigates the complex technical standards governing data communications over telephone networks, specifically focusing on the V-Series recommendations. Uyless D. Black, a recognized authority in computer communications, provides a technical translation of these standards to bridge the gap between abstract regulatory documentation and practical implementation. The text utilizes a structured framework to explain how physical-level interfaces and modem technologies facilitate reliable data exchange in diverse network environments.

Experts and practitioners in the telecommunications field frequently cite this work as a reliable reference for interpreting dense ITU-T standards. Readers note that the text successfully clarifies technical specifications for engineers and network administrators working with legacy and modern telephone-based data systems.