| 摘要 |
PURPOSE:To make it unnecessary to install an incoming register and an incoming register link, by giving the incoming register function to a loop dial trunk and receiving the loop dial signal from the other-party station. CONSTITUTION:After being detected in a DC loop detecting circuit 7, the incoming to a loop dial trunk 6 is transmitted from a signal transmission gate as the scan result to the incoming scan order from a central controller (CC) 4. After detecting the incoming, the CC 4 transmits the start order of the incoming register function to a controlling part 8 in respect to the pertinent loop dial trunk, and the controlling part 8 executes the selecting signal counting processing for the number of digits designated from the CC 4. While the incoming register function is executed in the trunk 6, the CC 4 executes periodically the scan for discrimination of selecting signal receiving completion. When the selecting signal reception is completed, receiving number information is scanned from the loop dial trunk 6 and is analyzed by a number analyzing program of the CC 4, and the control is transferred to following connection processings. The incoming register function is terminated by the end order from the CC 4. |
