The book "Digital transmission systems of synchronous digital hierarchy" by H. In. Tarchenko represents an important work in the field of telecommunications and digital technologies. This edition will be especially useful for students, graduate students, engineers and professionals working in the field of communications and information technology. In it, the author examines in detail the principles and mechanisms of the synchronous digital hierarchy (SDI), which makes it an indispensable tool for everyone who seeks to understand this complex but fascinating area more deeply. Synchronous digital hierarchy is the basis of modern data transmission systems, and in the book Tarchenko you will find a comprehensive explanation of its structure and functioning. The author shares his knowledge on how SCI provides high-speed information transmission, maintaining the reliability and quality of communication. The book explores key aspects such as the organization of data transmission, synchronization methods, and various levels of hierarchy that allow for effective management of information flows. One of the main themes of the book is the importance of synchronization in digital systems. Tarchenko explains how synchronization affects the quality of data transmission and how it avoids information loss These aspects are especially relevant in the modern world, where the amount of transmitted information is growing every day. Readers will be able to learn about how different technologies, such as multiplexing and coding, affect the efficiency of data transmission. The book will be of interest not only to specialists, but also to those who want to understand the basics of digital technologies. If you are a student studying telecommunications, or just like to understand new technologies, this publication will be a real find for you. It is written in accessible language, which makes it easy to assimilate complex concepts and apply them in practice. The author's style is distinguished by clarity and logical presentation, which makes the material easily perceived. N. In. Tarchenko is not only the author of this book, but also an experienced practitioner in the field of telecommunications, which gives his works special value. His previous publications have also earned recognition in professional circles and have become the basis for many training courses. The topics raised in the book go beyond simply describing the technical aspects. Tarchenko addresses issues related to the future of digital technologies, their impact on society and the economy He emphasizes that understanding the basics of synchronous digital hierarchy is not only the key to a successful career in the field of communications, but also the opportunity to consciously participate in the discussion of topical issues related to the development of technologies. If you are looking for literature on the subject of digital transmission systems, then “Digital synchronous digital hierarchy transmission systems” will be an excellent addition to your library. The book will help you not only deepen your knowledge, but also prepare for the challenges that the rapidly developing world of technology poses to us. Do not miss the chance to touch the knowledge that can change your idea of the digital future!