| 摘要 |
PURPOSE:To enable to apply a call processing program developed for a spatial split type exchanger to a time division type exchanger without any change, by providing a function which exchanges a control signal as well as an audio signal for a time division switch. CONSTITUTION:Voices from subscribers A and B are coded at subscriber circuits SUB1 and SUBn and connected to trunks TRK1 and TRKn via a serial parallel converting circuit 8P, a time division network TDNW, and a parallel serial conversion circuit PS. On the other hand, the state of calling of a subscriber, dial and during call, are processed in parallel at the same time slot as an audio signal bit via a multiplex circuit M. Thus, a trunk scanning circuit TSCN receives control information representing the state of subscribers in the same way that the information is received from a trunk connecting the subscriber. Further, a signal such as polarity inversion can be transmitted reversingly via a separating circuit D with the similar method from a relay controller RC. |
