| 摘要 |
A control system for use with a data transmission system having a plurality of subscriber stations connected exchangeably to a pair of transmission paths comprises a transmission control station provided for each of the transmission paths which produce an access signal to enable data transmission to be performed among the subscriber stations. One of the control stations is constantly operated, while the other control station serves as a stand-by station. When the access signal is not supplied to the subscriber station properly within a predetermined time, the subscriber station is disconnected from the operative transmission path and self-checking is executed. If abnormality is found to be present in the subscriber station through the self-checking, the latter is held in the disconnected state. When abnormality is detected in the operative transmission path, the subscriber stations are changed over to the stand-by transmission path. When abnormality is found in the in-service primary control station or in the transmission path, the control functions of the primary station are transferred to the stand-by transmission control station.
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