Loop transmission system with frame synchronization control

Details Loop transmission system with frame synchronization control Loop transmission system with frame synchronization control

H - Electricity

04

L

340/81

H04L 12/42 (2006.01)

Patent

CA 1251533

LOOP TRANSMISSION SYSTEM WITH FRAME SYNCHRONIZATION CONTROL ABSTRACT OF THE DISCLOSURE A loop transmission system with frame synchroniza- tion control includes a loop (1) through which informa- tion in the form of a sequence of frames is transmitted, a plurality of node units (51, 52, ..., 5n; 3, 4) inserted at predetermined positions in the loop (1) for receiving and delivering information, and a supervisory device (2) inserted at a predetermined position in the loop (1) for supervising the transmission of information through the loop (1) in association with the node units (51, 52, ..., 5n; 3, 4). The supervisory device (2) is operable to deliver a frame synchronization cancellation signal. Each of the node units (51, 52, ..., 5n; 3, 4) is adapted to detect the frame synchronization cancella- tion signal and cancel the synchronized operation state in bypassing or taking-in of a node and to restore synchronization in the frame next to the synchronized cancelled frame. Therefore, quick restoration of synchronization after bypassing or taking-in of a node is ensured. (Fig. 1)

501540

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