| 摘要 |
An ATM cell switching apparatus which prevents degradation of user cells in the ATM switch and preserve the quality of control cells, even upon increase in the control cells. Control cell discriminator 21 discriminates whether the cells on the input cell highways 11 are control cells or user cells, and output control cell dropping instruction signal 31 when the cells are discriminated as control cells. Control cell dropper 41 distributes the user cells onto the cell highways 51 and the control cells onto the input control cell highway 61. Control cell processing unit 8 performs a termination of the control cells and processes necessary operation ralating to the control cells. The control cells to be output are temporarily stored in the control cell FIFO 131, and inserted into an idle cell position in the switch output cell highway 101 when an idle cell is appeared. If no idle cell is available, the idle cell output instruction signal 141 is provided to the ATM switch to stop user cell outputting and to output idle cells for sweeping out control cells stacked in the control cell FIFO 131.
|
