The book "Digital functional devices in telecommunications: training manual . Part 1: Basic Digital Functional Devices by P. A. Capuro is an indispensable resource for students, professionals and anyone interested in modern technologies in the field of telecommunications. In the first part of this two-volume manual, the author immerses the reader in the world of digital technologies, revealing the key concepts and principles that underlie the functioning of telecommunication systems. P. A. Capuro, known for his in-depth knowledge of electronics and telecommunications, offers readers a unique perspective on digital functional devices. His style of presentation combines accessibility and scientific rigor, which makes the material understandable even for beginners. The book will be of interest to both students of technical universities and practicing engineers who want to update their knowledge about modern digital devices. In the first part of the manual, the author examines the basic digital functional devices, such as logic elements, multiplexers, demultiplexers and other components that form the basis of digital systems. Each chapter is filled with examples, illustrations and practical tasks, which allows readers not only to assimilate theoretical material, but also to apply it in practice. Capuro emphasizes the importance of understanding the working principles of these devices, which is necessary for successful work in the field of telecommunications. The topics raised in the book cover a wide range of issues, ranging from the basics of digital logic to more complex concepts such as synchronization and signal coding. Capuro not only explains how digital devices work, but also discusses their use in real communication systems, which makes the material especially relevant in the context of the rapid development of technology. This book will be a great help for students studying telecommunications, electronics and related disciplines. It will also be useful to practicing engineers and specialists working in the field of development and operation of telecommunication systems. If you are looking for a tutorial that will help you better understand digital technologies and their application in telecommunications, then “Digital Functional Devices in Telecommunications” is exactly what you need. Capuro is also known for his other works that deal with various aspects of electronics and telecommunications. His approach to teaching and explaining complex topics makes his books popular among students and professionals. In this manual, it continues its tradition of accessible and understandable presentation, making it an ideal choice for anyone who wants to master digital technology. Thus, “Digital functional devices in telecommunications: a training manual. Part 1" is not just a book, but a whole world of knowledge that will open before you. It will become your reliable companion in the study of digital technologies and will help you become a real professional in the field of telecommunications. Do not miss the opportunity to immerse yourself in the fascinating world of digital devices and learn how they change our lives.