| 摘要 |
PURPOSE:To easily compose a loop network and to efficiently execute a branch insertion by outputting a synchronizing signal cell from a main transmission line input to a main transmission line output to a branch inserting switch without delaying the cell. CONSTITUTION:A selector 18 is switched at the lower side of the figure when unoccupied and branching cells arrive, and a sub-transmission line input 2-1 inserts the cell stored in an insertion buffer 16 into a main transmission line 1. When the cell to be inserted into the buffer 16 does not exist, an unoccupied cell pattern is generated and inserted. When it pass through and distributing cells arrive, a signal is made to pass from a main transmission line input 1-1 to a main transmission line output 1-2. When branching and distributing cells arrive, an action for a writing to a branch buffer 17 is executed. At the input 2-1, the signal arrives asynchronously with the input 1-1. When a signal format is different from the main transmission line 1, the cell is resolved and assembled by a sub-transmission line interface circuit 12 and the buffer 16, and the cell with the same model as the cell of the main transmission line 1 is formed.
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