| 摘要 |
PURPOSE:To ensure the simultaneous operation for plural number of calls, by memorizing the correspondence between the call and the call corresponding button on the operator board onto the memory of the CPU. CONSTITUTION:When the operator presses down the 1st call button and then supplies the number of subscriber A to CPU16 through operator board 18, CPU16 selects idle board trunk 151 plus idle incoming or outgoing trunk 111 as well as idle buses 1 and 2 within switch networks 12 and 14 to give the start to the remote station through trunk 111. Thus the connection is secured for the channel of subscriber A-trunk 111-board-cord trunk 13. When subscriber A is called out, the operator supplies the number of subscriber B. Thus the connection is secured for the channel circuit of subscriber B-trunk 112-trunk 13. After confirmation for the start of talking between subscribers A and B, the operator supplies the cut-off request of the call to CPU17. And CPU17 memorizes the correspondence between the talking and 1st talking/monitor button of board 18 onto the memory, and then opens bus 2. After this, the operator connects the 2nd call in the same procedure and by means of trunks 113, 114 and 152 each. |
