Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1981-12-30
1984-05-29
Brown, Thomas W.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307257, H04M 322
Patent
active
044517033
ABSTRACT:
A line circuit for connecting a subscriber line to a telephony system that avoids the use of electro-mechanical elements such as relays. A bridge circuit includes a bilateral current gate in each of the tip and ring lines that can couple or inhibit signals from passing between the subscribed lines and the system. When the bilateral current gates are in an inhibit mode, an on-hook current source energizes the tip and ring lines. A detector senses when the subscriber goes off-hook, and also the dial pulses. After the current gate goes into a coupling mode, the on-hook current source and detector are electrically inactive, and an off-hook current source thereafter provides current to the tip and ring conductors.
REFERENCES:
patent: 2866103 (1958-12-01), Blake et al.
patent: 3737680 (1973-06-01), Uchida
patent: 3796894 (1974-03-01), Marchetti et al.
patent: 3973143 (1976-08-01), Embree et al.
"High Voltage Crosspoint Device for Line Concentrator Mounted on the Ceramic Board with Crossover Capacitance", Yoshino et al., International Switching Symposium (Paris), May 7-11, 1979, pp. 660-666.
"Electronic Replacements for Relays", A. W. Sweet, Electrical Communication, vol. 54, No. 1, 1979, pp. 51-55.
Brightman Barrie
Niertit Frank
Brown Thomas W.
Stromberg-Carlson Corporation
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