| 摘要 |
PURPOSE:To execute efficient unit connection between electronic exchangers, by providing a simple additional unit between the line concentrator additional unit and communication trunks and executing the line concentration of communication lines between electronic exchanger units without special alteration. CONSTITUTION:The communication trunks A and B are contained in the two wire type communication switch frame of the electronic exchanger unit, the additional unit D enables the connection between the trunk B and the line concentration additional unit C, and it provides the competition prevention circuit at the start of the trunks A and B, choke circuit, and vacant selection and start circuit at the start from the trunk B. Thus, the connection between the units of electronic exchanger can efficiently be made. |
