| 摘要 |
PURPOSE:To ensure order wire talking between stations in operation at that point of time even when a master station is not normally in operation by allowing a relay station to generate a TDM frame similarly to the case with the master station when the master station is not normally in operation and to apply limit control of simultaneous call to a terminal station. CONSTITUTION:The multi-direction multiplex communication system by the TDM (time division multiplex)/TDMA (time division multiple access) system is provided with a master station 1, a relay station 2, and terminal stations 3,4, and each station is arranged respectively with order wire talking sections 5-8. When subordinate stations 2-4 detect it that the master station 1 is not normally in operation, the relay station 2 is used as a tentative master station and the relay station 2 generates newly a TDM frame and sends it to the terminal stations 3,4, and the order wire talking section 6 controls limit of simultaneous calling of order wire to the plural terminal stations 3,4. Thus, even when the master station 1 is not normally in operation, the multi-direction multiplex communication system in which order-wire talking is attained is realized. |
