| 摘要 |
PURPOSE:To reduce the number of required wiring by providing a pilot number serivce by connecting the originating register and the idle-busy indication lead corresponding to the trunk to the electronic number group. CONSTITUTION:When subscriber SUBB oscillates, the line is connected to the oscillation register OR while at the same time marker M sends service location information of SUBB and OR number to electronic number group ENG, thus setting the corresponding memory in the busy condition. When under this condition an incoming signal iis sent to a pilot subscriber of both pilot subscribers of SUBB- SUBD, NEG selects a subscriber with higher priority, for example, SUBC from the memory that memorizes the idle-busy of subscribers SUBB-SUBD according to the pilot numbers. With ENG, the memory corresponding to SUB is made busy and service location information of switch frame switch corresponding to SUBC is sent to marker M. Marker M connects trunk 1CT to SUBC in the route of SW3. |
