| 摘要 |
PURPOSE:To attain the effective use of a meeting line by occupying one of time slots for general call when necessary for the meeting line and therefore eliminating the disturbance to other talking circuits without using any special signal system. CONSTITUTION:Plural slave stations B are provided to a master station A to form a time division multi-connection system. Then call line control circuits 4-6 are connected to the station 1 via general call lines 1-3, and a switch network 7 and a center control part 11 are connected to circuits 4-6 to perform the 2-/4- wire conversion and level conversion. While a meeting telephone 14 is connected to the network 7 via a meeting line 15, and the outputs of time slot control circuits 8-10 and a time slot control circuit 13 for control connected to the part 11 are supplied to a radio unit 16. Thus a talking circuit is formed to stations B by means of a time slot. The output of a slave station control part 18 of a slave device B is supplied to a changeover switch 19 and allocated to a general talking circuit 20 and a meeting line 21 by the switch 19. Then one of slots is occupied by the circuit 21 when necessary. |
