| 摘要 |
The transmission sequence is matched between the reception side and the transmission side when communication is performed by forming a plurality of transmission bands between shelves each formed of physical layer processing parts (transmission processing parts) and an ATM layer processing part (cell processing part) with the use of a UTOPIA interface. For this purpose, the address monitor part ( 14 ) of the transmission side shelf ( 1 ) sequentially reads destination addresses of ATM cells transmitted from the master part ( 11 ) of the cell processing part and sends the read addresses as cell order signals in the same sequence as they are received, to the cell output switching part ( 24 ) of the reception side shelf ( 2 ). The cell output switching part ( 24 ) releases the mask such that an ATM cell is output by only one of the slave parts ( 22 A, 22 B, . . . ) of the transmission processing parts corresponding to the address received as the cell order signal, while blocking by masking the ATM cell outputs of the slave parts having the other addresses regardless of whether they store ATM cells or not. The destination addresses are assigned to each pair of the slave parts ( 12 A, 22 A, 12 B, 22 B, . . . ).
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