| 摘要 |
PURPOSE:To perform the outgoing/incoming start with an assured way and a simple circuit by the power fed from a trunk line, by driving an outgoing loop forming switch to start outgoing and inverting the power supply polarity to start the incoming. CONSTITUTION:When an outgoing loop forming switch HSW is closed, a power supply bus is formed to include a power supply line L1, a diode D1, the switch HSW, a diode D4 and a power supply line L2. Then the outgoing is started and the power is supplied. In the incoming mode, the polarities of the lines L1 and L2 are inverted by a station to form a power supply bus of the line L2, a power supply circuit DEN, a diode D2 and the line L1. Then the incoming is started and the power is supplied. |
