| 摘要 |
PURPOSE:To realize the increment of the originating register routes without adding any route relay but by providing the switch circuit to be controlled by the level information of the calling subscriber to the originating register selecting circuit. CONSTITUTION:In case the originating register route lacks, the operating circuit for both relays ORA and ORB is prepared by using level developing circuit LV. For instance, if route O is doubled, contact ro' is connected to terminal LV. And thus in case the subscriber stored in levels 0-4 gives the call, route relay RO operates. And thus relay ORA operates, and the switch circuit through the break contacts of contacts ora<0>-ora<9> is opened to cut off the operating circuit for level relays TG0-TG19. Accordingly, relays TG0-TG9 corresponding to idle originating registers ORA0-ORA9 operate, and a unit of the highest priority holds the operation via contact tg<0> to select one unit of the originating register among originating register ORA groups. |
