Aeronautical telephone system in Japan

NIPPON TELEGRAPH AND TELEPHONE CORPORATION (NTT) has developed an aeronautical telephone system, which will be commercially available in 1986. This system operates on the 800-MHz frequency band, and with six base stations, covers almost all domestic air routes in Japan. Futhermore, it utilizes Phase Modulation(PM) to satisfy the required speech quality for public telephone service. Mobile Control Stations(MCS) and Automobile Switching Centers (AMC) are shared with the automobile telephone system to reduce the system s construction costs.