| 摘要 |
<p>PURPOSE:To realize the recovery of a failure in a loop data transmission system in a shoort time, by providing a line failure detector at the receiving end of each station and performing folding control at each station detecting the failure of line. CONSTITUTION:If a failure takes place on a transmission line e1, interruption of signal due to the transmission line is detected with a line failure detection circuit 31 of a DST (data station) 2, and the output C1 goes to ''1''. An output of a receiver R2 is inputted to a receiving end RX of a station control section 50 from a switching circuit 41 and an output of a transmitter T2 is made to non- signal state with the control signal C1. Through the operation of the DST2, since a transmission line e2 to the other DSTs is at non-signal state, a line failure detection circuit 32 is operated and a control signal C2 goes to ''1''. The output of a transmitter T2 is made into the non-signal state and data at the transmission end TX of the control section 50 is transmitted to the down stream of the transmission line e2 via the transmitter T2.</p> |
