Power line carrier telephone extension system for full duplex conferencing between telephones and having telephone call hold capability
作者： William M. Brown , James R. Lindquist
DOI:
关键词:
摘要: In a power line carrier telephone extension system for transmitting electrical signals between the and one or more telephones over AC electric available at subscriber's premises, that includes main station processing lines of plugs into line, all which can place calls to answer from conference together in full duplex communication, means initiating hold signal is transmitted where detected initiates connecting impedance across line.
google.com.bd 参考文章(14)
Frank L. Simokat, Amplitude modulated telephone carrier system and terminal equipment therefor ,(1978)
Donald A Beuscher, Selective carrier type communication system ,(1957)
Jagdishchandra T. Gajjar, Method of, and apparatus for, inserting carrier frequency signal information onto distribution transformer primary winding ,(1980)
Ian A. Whyte, Bidirectional communication system for electrical power networks ,(1975)
Roger C Glidden, Combination telephone fire alarm and meter reading system ,(1967)
Carl D Wadsworth, Digital communication system which can be utilized as a security system for apartment houses or the like ,(1974)
William M. Brown, Robert T. Dunn, John M. Ruddy, Remote signalling to a telephone line utilizing power line carrier signals ,(1976)
William M. Brown, Robert T. Dunn, Telephone extension system utilizing power line carrier signals ,(1982)
Bertrand Dorfman, Victor Zadikow, Carrier current communications system ,(1977)