| 摘要 |
<p>PURPOSE:To reduce greatly the power consumption within a subscriber circuit by actuating a contact corresponding to a circuit which stores the subscriber lines at a short distance. CONSTITUTION:A subscriber circuit device LCU2 contains a 24V voltage source PW, relay contacts S1-S2m and a control circuit CU in addition to (n) units of subscriber circuits LC1-LC2m (m=n/2). The contacts S1-S2m connect circuits LC1-LC2m to a DC -48V power supply respectively in a recovery mode. Thus the DC -48V is used as the feed voltage. The operating states of contacts S1- S2m are separately controlled by the circuit CU. As a result, the power consumption within the circuit LC can be reduced down to half or so while maintaining a desired call current by actuating the contact S corresponding to the circuit LC which stores the subscriber lines at a short distance.</p> |
