DocumentCode
2878620
Title
The State of the Art of Telecommunications Power Plants in Japan
Author
Hirano, By Nobu ; Yoneoka, Yutaka
Author_Institution
NIPPON TELEGRAPH AND TELEPHONE PUBLIC CORPORATION
fYear
1978
fDate
25-27 Oct. 1978
Firstpage
6
Lastpage
10
Abstract
Various power supply systems for NTT gigantic communication network which involves the world second largest number of telephone sets are described. As for the standard telecommunications power supply in Japan, -48 volts DC is used for switching systems, while -21 volts DC for carrier and radio communication systems and 200 volts AC for data communication systems. However, they are gradually forced to change their supply patterns into lower voltages by the recent transistorization of the communication systems.
Keywords
Communication networks; Communication standards; Data communication; Power generation; Power supplies; Radio communication; Switching systems; Telecommunication standards; Telephone sets; Voltage;
fLanguage
English
Publisher
ieee
Conference_Titel
Telephone Energy Conference, 1978. INTELEC '78. International
Conference_Location
Washington, DC, USA
Type
conf
DOI
10.1109/INTLEC.1978.4793513
Filename
4793513
Link To Document