| 摘要 |
PURPOSE:To eliminate the use of a synchronizing circuit and to simplify the constitution of a subscriber line transmission circuit by storing the data given from a terminal to a digital exchange in a start-stop data style. CONSTITUTION:An asynchronous data digital exchange system comprises a transmission side data communication device 1, a reception side data communication device 3, digital subscriber circuits 2 and 4 constituting a digital exchange, and a network 5. An asynchronous data receiving circuit 11 of the device 1 receives the start-stop data from a terminal A. The digital data consisting of a start bit ST, data bits D0-D7, control signals S0 and S1 and a stop bit SP is supplied to a subscriber circuit 2 of the exchange from an asynchronous data assembling circuit 12 via a subscriber line l1. Then the digital data is supplied to the device 3 via the network 5 and the circuit 4 and through a subscriber line l2. An asynchronous data decomposing circuit 32 of the device 3 eliminates the signals S0 and S1. Thus a synchronizing circuit can be omitted.
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