The switching field of digital ATC F 50/1000: Methodical instructions for laboratory work on the course "Commutation Systems" by Sergey Mikhailovich Lapshin is a unique work that will become an indispensable assistant for students studying modern communication and telecommunications systems. This work not only covers theoretical aspects, but also offers practical assignments that will help to deepen knowledge and skills in the field of digital automatic telephone stations (ATS). The main goal of the book is to introduce students to the principles of work and the device of digital PBX, as well as teach them to conduct laboratory experiments that will help to better understand the complex processes occurring in switching systems. Lapshin, with a wealth of experience in the field of telecommunications, shares his knowledge, which makes the material accessible and understandable to readers. The book includes detailed descriptions of the various components of the PBX, their functions and interaction, which allows students not only to learn the theory, but also to apply it in practice. Who can like this book? First of all, it is intended for students of technical universities studying specialties in the field of communication and information technology . However, interest in it can also be shown by practitioners who want to update their knowledge about modern switching systems. The book will also be useful to teachers who are looking for high-quality teaching materials for laboratory classes. The themes that are raised in the book are diverse and relevant. Lapshin considers not only the technical aspects of the PBX, but also issues related to the development of communication technologies, their impact on society and the economy. The book covers such important topics as digitalization, process automation and the introduction of new technologies in everyday life. This makes it relevant for readers interested not only in technical but also social aspects of the development of telecommunications systems. The author's style is distinguished by clarity and accessibility of presentation, which makes it easy to perceive even the most complex concepts. Lapshin skillfully combines theory with practice, which makes his book not just a textbook, but a real guide in the world of digital technologies. Among other well-known works of the author are his works on communication systems and guidelines, which are also popular among students and specialists. The book "Commutation field of digital ATS F 50/1000" is not just a set of methodological guidelines, but a whole world into which the reader plunges, studying modern communication systems. It will be an excellent addition to the educational process, as well as a source of inspiration for future engineers and specialists in the field of telecommunications. If you are looking for a high-quality and informative manual on switching systems, this publication should definitely take a worthy place on your shelf. Do not miss the opportunity to expand your knowledge and skills in the field of digital PBX with this book, which has already won recognition among students and teachers. Be inspired, learn and apply the knowledge gained in practice!