ATM cell exchange
AssigneeOki Electric Industry Co., Ltd.
InventorsKenichi Nagatomo, Masami Hagio
Life of this patent
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Abstract
To realize an ATM cell switch capable of reducing the transmission rate of cells to be transmitted, a output buffer-type ATM cell switch includes input units buffer unit, and output units, wherein the buffer units reduce the transmission rate of the cells. Furthermore, the ATM switch compares the destinations of the cells with destination set signals that are provided to address filter units in the buffer units, and controls the transfer of cells to the buffer memories in the buffer units, thereby efficiently reducing the transmission rate of cells.
Claims16
An output buffer type ATM cell exchange system, comprising:
- an input arrangement for receiving cells via n input ports, each of the cells having destination information;
- an output arrangement for emitting cells via n output ports in accordance with their destination information;
- and
- a buffer arrangement between the input arrangement and the output arrangement, the buffer arrangement including at least n sub-buffer units,
- wherein each sub-buffer unit includes a buffer memory unit and a plurality of address filters, each address filter receiving a plurality of groups of cell information, each group of cell information including information contained in a corresponding one of the cells that was received by the input arrangement, each address filter additionally receiving destination information derived from the corresponding cells for the groups of cell information, and each address filter additionally receiving destination-set data corresponding to one of the n output ports, and
- wherein each address filter includes a plurality of parallel expansion units for parallelly expanding the groups of cell information, a multiplexer for multiplexing the parallelly-expanded groups, and a write controller which allows a parallelly-expanded and multiplexed group of cell information whose destination information agrees with the destination-set data to be written into the buffer memory unit.
An output buffer type ATM cell exchange system, comprising:
- an input arrangement for receiving cells via n input ports, each of the cells having destination information, and for dividing each cell except for the destination information therein into a first number of groups of cell information;
- an output arrangement for emitting cells via n output ports in accordance with their destination information;
- and
- a buffer arrangement between the input arrangement and the output arrangement, the buffer arrangement having a second number of buffer units, the second number being equal to the first number, each buffer unit receiving the destination information for all of the cells received by the input arrangement, each buffer unit having n sub-buffer units,
- wherein each sub-buffer unit includes a buffer memory unit for selectively storing groups of cell information and outputting the stored groups to the output arrangement for emission by one of the output ports, and
- wherein the output arrangement includes n output units, each output unit corresponding to one of the output ports and converting a group of cell information received from a sub-buffer unit in each of the buffer units, plus destination information, into a cell emitted by the corresponding output port.
Dependencies are inferred from the claim text.