| 摘要 |
Apparatus for the activation of a remotely located device under the control of telephone subscriber lines and stations. The apparatus of the present invention is located in the vicinity of a called telephone subscriber station and is operated to activate a remotely located device through two series of ringing signals initiated by a calling telephone subscriber station and produced by the called telephone subcriber station. The first series of ringing signals activates a timer which resets a counter that controls the operation of the remotely located device providing the counter is not on a preselected code position. The timer disables the counter from receiving counting pulses during the first series of ringing signals. In addition thereto, the timer enables the counter to receive counting pulses during a period P2. Should the second series of ringing signals be produced by the called subscriber station within the period P2 and be a preselected number of ringing signals, the counter will then activate the remotely located device.
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