| 摘要 |
<p>A solid state remotely actuable switch (10) is described for testing and remotely disconnecting a circuit. In one embodiment, a solid state bilateral switch (12) such as a triac is connected in series with the remote circuit, and a trigger device such as a diac (20) is connected between the gate (18) of the triac (12) and the remote circuit. The switch (10) is placed within the tip and ring line of a telephone circuit for remotely disconnecting the telephone subscriber's side for testing the remote circuit. In a second embodiment, a remotely actuable switch includes a field effect transistor (38, 40) connected in series with each tip and ring circuit, a resistance-capacitance time-constant circuit (110, 112) for energizing the FETs and a discharging means for discharging the capacitor of the resistance-capacitance circuit in response to the control signal from the central office. Various devices for disconnecting subscriber circuits are disclosed.</p> |
