| 摘要 |
In a digital transmission system wherein a plurality of transmission control units each of which has received data error detecting means, data storing means, receiving means and transmitting means are successively connected by a transmission medium, the transmission control unit is operated in a through mode in which received data is directely forwarded under a normal state, and when an error has been detected in received data, the operation mode of the transmission control unit is switched to a store-and-forward mode in which a group of received data are first stored and are thereafter forwarded only in the case of the absence of an error. When normal data have been continuously received in a predetermined number of times in the operation in the store-and forward mode, the operation mode of the transmission control unit is switched to the through mode.
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