Telecommunication System: Network and Components
Takanobu Suzuki, Fumihide Sugino, Katsumi Sakaki · 2014
According to the White Paper on Information and Communications in Japan [1], the information and communication industry is a term that encompasses three lines of business: telecommunications, broadcasting, and postal correspondence. This chapter chiefly discusses telecommunications business from an urban lifeline point of view, but given that telecommunications using metallic cables is now giving way to optical communication using optical fibers and wireless communication using electromagnetic waves as the mainstream technologies, its discussion will be confined to the field of information and communication [2].