Title :
Transmission quality of evolving telephone services
Author :
Takahashi, Kenzo
Author_Institution :
Telecommun. Quality Labs., NTT Corp., Tokyo, Japan
Abstract :
Various aspects of transmission quality in evolving telephone services are reviewed and summarized from the customer´s point of view. The evolution of the public switched telephone network is described. Quality specification methodology is examined, covering transmission standards, the room environment, and quality measures. Transmission quality in mixed analog and digital operation and in advanced telephone services are considered. Future telephone services are discussed.<>
Keywords :
standards; telecommunication services; telephone networks; analog operation; digital operation; public switched telephone network; quality measures; room environment; telephone services; transmission quality; transmission standards; Communication switching; Delay; Digital signal processing; Economics; Encoding; Nonlinear distortion; Propagation losses; Quality of service; Telecommunication switching; Telephony;
Journal_Title :
Communications Magazine, IEEE
