Title :
The impact of ISDN on Japan´s telecommunications power system
Author :
Sugiura, Toshiyuki ; Ogata, Tsutomu ; Koyashiri, T.
Author_Institution :
Appl. Electron. Labs., NTT, Tokyo, Japan
fDate :
30 Oct-2 Nov 1988
Abstract :
The authors describe the state of ISDN (integrated services digital network) services in Japan and discuss issues concerning power supply systems suitable for the ISDN age. A distributed power supply system has been developed to solve the problems posed by centralized systems in telephone offices when ISDN systems are adopted. A compact, thin board-mounted DC-DC converter for a digital switch system has been developed. In addition, a small-size constant-current DC-DC converter has been developed for the metallic subscriber-loop system. A small-capacity uninterruptible power unit with back-up batteries, for use on subscriber´s premises, has been developed for the optical-fiber subscriber loop systems. An extremely lightweight, high-voltage DC-DC converter for a communications satellite has also been developed
Keywords :
ISDN; power convertors; power supplies to apparatus; DC-DC converter; ISDN; Japan; communications satellite; power convertors; power supplies to apparatus; power supply systems; subscriber-loop system; telecommunications power system; telephone offices; uninterruptible power unit; Batteries; Communication switching; DC-DC power converters; ISDN; Optical switches; Power supplies; Power systems; Switching converters; Telephony; Uninterruptible power systems;
Conference_Titel :
Telecommunications Energy Conference, 1988. INTELEC '88., 10th International
Conference_Location :
San Diego, CA
DOI :
10.1109/INTLEC.1988.22319
