| 摘要 |
Circuit for two-number line switchboard device, containing relays, connected to the line wires, which detect calls from subscribers, a disconnecting relay, a diode bridge and a set of make contacts of the relays detecting calls from subscribers, making it possible to establish the proper polarization of the line, characterized in that the first low-resistance winding (A2) and the second low-resistance winding (A3) of the disconnecting relay of the two-number line unit are connected in the path of the two-number line between the diode bridge (D) and the set of make contacts (ZZZ) of the relays detecting calls from subscribers, while between the first winding (Xa1) of the relay detecting calls from subscriber (X) and the first winding (Ya1) of the relay detecting calls from subscriber (Y) is situated the contact (a4) of the disconnecting relay of the two-number line unit.<IMAGE>
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