Cell switch module with unit cell switching function
AssigneeFujitsu Limited
InventorKatsuyuki Tada
Life of this patent
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Abstract
A cell switch module having a unit cell switching function and placeable in either an active state or a standby state. The module comprises a plurality of input ports for inputting cells thereto, a plurality of output ports for outputting cells therefrom, and a cell switching controller to execute such control that, in response to an active/standby switching instruction, a decision is made as to whether the input cell is a specific first cell or not, and if the input cell is detected to be the first cell in the active state, any subsequent cell inputted thereafter is not switched, but if the input cell is detected to be the first cell in the standby state, any subsequent cell inputted thereafter is switched.
Claims5
A cell switch module having a unit cell switching function, comprising:
- a plurality of input ports for inputting cells thereto respectively;
- a plurality of output ports for outputting cells therefrom respectively;
- and
- cell switching control means placeable in either an active state or a standby state and executing control in such a manner that, in response to an active/standby switching instruction, a decision is made as to whether each cell obtained from the relevant input port is a specific first cell or not, and if the cell is said first cell in the active state, any subsequent cell obtained thereafter from the input port is not switched, but if the cell is said first cell in the standby state, any subsequent cell inputted thereafter is switched.
A cell switch module having a unit cell switching function, comprising:
- a buffer memory for storing the switched cells;
- a plurality of input ports for inputting cells thereto respectively;
- a plurality of output ports for outputting cells therefrom respectively;
- cell cross-connect means for routing the cells received from the input ports, then writing the cells successively in the relevant buffer memory;
- cell switching control means placeable in either an active state or a standby state, and controlling the switching in such a manner that, in response to an active/standby switching instruction, a decision is made as to whether each cell obtained from the relevant input port is a specific first cell or not, and if the cell is said first cell in the active state, any subsequent cell obtained thereafter from the input port is not switched by said cell cross-connect means, but if the cell is said first cell in the standby state, any subsequent cell inputted thereafter is switched by said cell cross-connect means;
- cell reading control means placeable in either the active state or the standby state, and serving, in the active state, to successively read the cells written in said buffer memory;
- and
- queue empty detection means placeable in either the active state or the standby state, and serving, in the active state, to detect whether the all cells written in said buffer memory have been completely read out therefrom.
Dependencies are inferred from the claim text.