| 摘要 |
PURPOSE:To obtain complete charge information even at a private branch of exchange, by adding a simple hardware, and making an outgoing call from a main telephone an objective for totaling of charges. CONSTITUTION:A main trunk 11 of a private branch of exchange 1' is connected to a main trunk 3 via a relay contact r of a main station switching trunk 2 at night, and a night main station 4 is connected to a loop detection and inversion detection circuit 24 of the trunk 2'. With this state, the main trunk 3 is connected to the station 4 with the operation of a relay 21, a loop state signal is added to a control circuit 25 from the circuit 24, and if no dial pulse is detected within a prescribed time, no charge is collected as an incoming call. When the dial pulse is detected, the result of count at a count circuit 26 is sequentially stored in numbering registers 271-27n. When the opposing subscriber is responded and the inversion of the voltage of th main trunk 3 is detected at the circuit 24, a response signal sets a clock 28 at the circuit 25 and inputs a call time in time registers 291-29n, and charge collecting information is stored in a memory 30. |
