| 摘要 |
An interface circuit for transmitting data and voice signals between a CENTREX equipped central office exchange and a remotely located attendant console. The interface circuit includes an analog interface arranged to receive analog voice signals from the attendant console and to convert the analog signals into digital signals for transmission to the central office exchange. Alternatively, digital signals received from the central office exchange are converted to analog voice signals and are transmitted to the attendant console. A digital interface connecting the attendant console and the central office exchange includes an interface controller arranged to control the operation of the digital interface. The digital interface further includes input data storage means for storing digital data transmitted by the central office exchange, output data storage means for storing digital data transmitted by the attendant console and serial transmission/receiving means for transmitting and receiving the digital data transmitted and received between the interface circuit and the attendant console. Responsive to control signals from the central office exchange, control data written to the input data storage means is processed by the interface controller and transmitted to the attendant console via the serial transmission/receiving means. Similarly, responsive to control signals from the interface controller, data processed and written to the output data storage means is read by the central office exchange.
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