| 摘要 |
PURPOSE:To realize the effective distribution of the feeding facilities as well as the contact cleansing of the exchange by feeding only to the tranmission circuit which is connected and used through the exchange. CONSTITUTION:Feeding power source 2 is distributed to n-pieces of transmission circuit 1 at the incoming side of exchange 3, and the feeding starts through power source 2 when one of m-piecs of transmission circuit 4 connected to circuit 1 is connected. As a result, n-unit of the feeding power source can supply the power to m-units of the circuit (m>n), and the contact of exchange 3 can be cleansed with the fed current. |
