| 摘要 |
1. Switching level (10) of an operator in a digital data block switching network within which the data are transmitted in parallel, the level comprising n bidirectional ports (11) each comprising an input port (12) and an output port (13, 14) and being each connected to a bidirectional port of another operator of the same network, each input port (12) of the level being adapted to be connected to any of the n output ports (13, 14) through a bus line (33) controlled by a single logic control circuit (15) and to which the outputs of the input ports and the inputs of the output ports are connected, each output port of the level comprising a transmitter circuit (13) essentially comprising a parallel-serial output register, characterized in that each output port further comprises a read/write storage memory (39) the data inputs of which are connected to a the common bus line (33), in that the logic control circuit (15) comprises two programmed logic circuits, one (43, 49, 50) for writing and the other (51, 52, 53) for reading, and supplying the writing and reading addresses, respectively, of the storage memory of the different output ports through an output multiplexer (54), in that each output port further comprises a priority marking memory (40) of "first in-first out" type, the inputs of which are the writing addresses of the storage memory supplied by the programmed writing logic, the reading control logic generating the reading addresses of the storage memories of the different output ports from the writing addresses of these storage memories supplied by the priority marking memory, and in that the data outputs of the storage memory (39) are connected to the inputs of the parallel-serial output register of the transmitter circuit (13). |
