| 摘要 |
PURPOSE:To enable to simplify the design work of a trunk controller by decentralizing and making trunk controllers into modules for every trunk circuit. CONSTITUTION:An acquition signal received by trunk circuit 221 is detected by scanner 223 and then read in switching processor 21 with input and output instructions sent out of switching processor 21 periodically via input-output control bus 251. Next, after the reception of a selected number is held in readiness, switching processor 21 sends input and output instructions via input-output control bus 251 and input-output control bus interface circuit 225 to drive signal distributing circuit 224, and then the relay in trunk circuit 221 is operated to send a set-up completion signal to an outgoing-side switchboard. |
