Apparatus for controlling the application of telephone line power in a telephone set
作者： Donald Richard Means , Donald Dean Huizinga , Terrence Lee Essig
DOI:
关键词: Class 4 telephone switch 、 Telephone exchange 、 Line card 、 Electrical engineering 、 DMS-100 、 Class 5 telephone switch 、 Engineering 、 Telephone line 、 Asymmetric digital subscriber line 、 Number One Crossbar Switching System
摘要: The present apparatus for controlling the application of telephone line power in a set has obviated requirement local source at premises customer. A data processor-based incorporating invention comprises supply having first and second voltage storage devices (C401, C402) which accumulate charge from line. First regulator circuits (410, 420) regulate charging distribution to power-consumptive components during on-hook off-hook switchhook conditions. threshold detector (301) actuates power-down consumptive including processor (210) when falls below particular value. In meantime, is continuously provided certain essential such as volatile memory (220) processor. impedance switch (202) under control intentionally increases resistance so that delivered increased, increased powering require higher level proper operation.
lens.org 参考文章(13)
Andre Deluegue, Telephone transceiver with amplified microphone and speaker ,(1974)
Frank T. Ferguson, Reserve power supply for computers ,(1980)
Mitsuo Morihisa, Hideyuki Akao, Norio Muguruma, Memory protection system ,(1981)
Walter George Kutzavitch, Ronald Wayne Christian, Power supply circuit for a data processor ,(1979)
LeRoy S. Baker, Frank L. Simokat, Battery charger control circuit for telephone transmission systems ,(1973)
Barry Sheldon Bosik, Dale Eugene Stone, Telephone ringing control circuits ,(1975)
William H. Herndon, Low voltage data retention bias circuitry for volatile memories ,(1977)
Klaus Walla, Circuit for a line-fed loudspeaking telephone station ,(1979)
Heinrich Dipl.-Ing. Sailer, Torsten Dipl.-Ing. Vogeler, Surveillance circuitry for an input voltage ,(1980)
Tuan-Kiet Duong, Jean Montenot, Telephone set having earpiece amplifier - whose gain can be preset by user by dialling selected code using phone dial or pushbutton keyboard ,(1979)