| 摘要 |
PROBLEM TO BE SOLVED: To provide the multiplexing method of the asynchronous signals of a sub rate capable of realizing O-order group signals capable of a digital addition processing. SOLUTION: Asynchronous sub rate signals sent from terminal equipment through an external interface are received by a serial input/output part 22, a start bit, a stop bit and a parity bit are detached and only character data are fetched through a bus to a central processing unit 24 and sent out through the bus to the serial input/output part 25 as they are. Also, after adding the start bit and the stop bit to the character data received in the serial input/output part again, they are taken out as the signals of the synchronous system of a bearer speed slightly faster than the sub rate signals received in the same serial input/output part, the signals of the plural bearer speeds. sent from the serial input/output part are turned to the 0-order group signals of 64 kbit/s and a multiplexing processing is performed in a multiplexing part 26.
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