I have written the textbook keeping in mind the problems which I have faced in my earlier days of studies as a student and for the same reason I have tried to place this book for the students to have better understanding of the subject and I believe this book will serve them as a book ‘‘made easy’’.
This book is intended to be used as an introductory text for the study of line communication system. In our present age of advanced telecommunication, the terms switching, sampling, BPS, broadband, are not foreign words. The present book is written for understanding the concept of computer communication, simplex/duplex communication, detailed knowledge of telephony upto the present age key switching i.e., ISDN. This book can be served as the textbook for undergraduate courses (BTech/B.E./B.Sc.) of information technology, electronics and communication engineering. An enormous research and developments are undertaken under various industries in the fast growing field of telecommunication switching. The present book provides best knowledge in depth on line communication system. Though the book can be considered as a textbook for any university, the content is designed specially for the subject ‘‘Line Communication System’’ (ECE dept., 5th semester) introduced by West Bengal University of Technology. Moreover, the approach of presentation is such that, students can easily understand the concept and they can memorize the same without much effort.
I am really greatful to some of the persons for their kind co-operation without whom I believe I’ll not be able to complete this book. Firstly I want to mention my family. My brother (Anibarn), Sister (Adwitia), parents (Barun & Nabanita) inspired me a lot to go ahead with my goal. Two of my beloved students namely Pabitra Mukhopadhaya and Koyel Kujan Kundu helped me a lot in collecting data and other information while I am fortunate enough to be gifted with the blessings of the two great personalities Dr. Arun Kr. Ghosh and Dr. Shankar Sen. I am really inspired by them to go ahead with my mission.