| 摘要 |
PURPOSE:To absorb differences in signal system and timing of every circuit through software in a control system for a circuit switching type time-division data exchange, by providing a microprocessor to a subscriber circuit unit. CONSTITUTION:Transmitted data from a transmission side data equipment DTE is processed through the level conversion of a subscriber device LCU, switched by a time-division switch TDSW, and processed again through the level conversion of the device LCU to be received by an incoming-side terminal DTE. The level variation of the terminal DTE during calling or on-hook operation is level- converted by a subscriber circuit LC, and converted series to parallel to be fetched into a microcomputer muP and a memory MEM; and it is compared with stored old data and when calling or disconnection is detected, the detection result is reported to a controller SPC via an interface INF. A signal from the controller SPC to a circuit and its level are fetched into the memory MEM to be sent to the terminal DTE under the program control of the computer muP. |
