| 摘要 |
PURPOSE:To constitute an N-party conference trunk only with 3-party trunks by using a special number of the 3-party conference trunks from which three kinds of voice outputs are led out freely. CONSTITUTION:N-party of voice inputs T1-TN are fed respectively to incoming time slots 2 of a time division switch 1 and an added output of other voice inputs except one voice input among voice inputs T1-TN is led to N-set of corresponding time slot in the outgoing time slot 3. In order to obtain N pcs. of added outputs, a number, expressed in equation, of 3-party conference trunks 6, 7, 16-23 are used. Thus, only with the 3-party conference trunks, the N-party conference trunk is constituted so as to attain effective utilization of equipment. |
