Order wire in telephone communication system
First Claim
1. An order wire circuit, installed in addition to a trunk connecting a master station and a dependent station in a telephone system, comprising:
- a first telephone terminal located in the master station;
a second telephone terminal located in the dependent station;
a telephone line connecting said first and second telephone terminals;
hooking detection means installed in said master station, for specifically detecting a hook state operation initiated in the dependent station by an operator of said second telephone terminal;
switching means for switching said telephone line from said first telephone terminal to a public line when said hook state operation initiated in the dependent station by an operator, is specifically detected.
1 Assignment
0 Petitions
Accused Products
Abstract
A switchable order wire circuit installed in addition to a trunk connecting a master station which includes an exchanger and a dependent station in a telephone system. The order wire circuit includes a first telephone terminal located in the master station, a second telephone terminal located in the dependent station, and a pair of telephone lines connecting the first and second telephone terminals. The order wire circuit also includes a hooking detection system installed in the master station, for detecting a hooking operation of the second telephone terminal. In addition, a circuit for switching the telephone lines from the first telephone terminal to a public line when the hooking operation is specifically detected is included. The hooking operation is generally specified by an on-hook state of the second telephone terminal after a first off-hook state is determined to be shorter than a first predetermined period and the first predetermined period terminates within a second predetermined period measured after the first off-hook operation of the second telephone terminal.
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Citations
3 Claims
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1. An order wire circuit, installed in addition to a trunk connecting a master station and a dependent station in a telephone system, comprising:
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a first telephone terminal located in the master station; a second telephone terminal located in the dependent station; a telephone line connecting said first and second telephone terminals; hooking detection means installed in said master station, for specifically detecting a hook state operation initiated in the dependent station by an operator of said second telephone terminal; switching means for switching said telephone line from said first telephone terminal to a public line when said hook state operation initiated in the dependent station by an operator, is specifically detected. - View Dependent Claims (2)
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3. An order wire circuit, installed in addition to a trunk connecting a master station and a dependent station in a telephone system, comprising:
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a first telephone terminal located in the master station; a second telephone terminal located in the dependent station; a telephone line connecting said first and second telephone terminals; hooking detection means for detecting whether or not said second telephone terminal is off or on hook, said hooking detection means including, a first timer for timing an on hook state occurring after a first off hook state begins until a second off-hook state occurs, and producing a first output when said on hook state lasts no longer than a predetermined first period; a second timer for producing a second output for a predetermined second period following detection of said initial off hook state of said second telephone terminal; and specific hooking operation detecting means for outputting a specific hooking signal when said first output is produced at the same time as said second output; and switching means for switching said telephone line from said first telephone terminal to a public line when said specific hooking operation detection means outputs said specific hooking signal.
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Specification