| 摘要 |
PURPOSE:To attain a circuit switching action with simple constitution and with high reliability by providing a high-speed switching circuit and a coaxial switching circuit to a bipolar signal stage circuit to actuate the high-speed switching circuit when the using circuit has a fault and to actuate the coaxial switching circuit in case a circuit switching action is impossible owing to a fault of the high-speed switching circuit. CONSTITUTION:A high-speed switching circuit 5 is inserted to a bipolar signal stage circuit and a coaxial switching circuit 6 is connected to the outside of the circuit 5. In case either one of using circuits 8-1-8-n has the deterioration of quality, the circuit 5 switches the relevant using circuits to a spare circuit 7 with no hit. If the circuit 5 has a trouble by some reason and is incapable of a circuit switching action, the trouble is detected to actuate a coaxial switching circuit 3. Then the faulty using circuit is switched to the circuit 7. |
