| 摘要 |
<p>In a quality monitoring apparatus for monitoring the quality of ATM cells stored in a buffer, a programmable counter is provided for decrementing a count value in response to each cell forwarded from the buffer to define a time window of variable size. Responsive to each cell discarded from the buffer, a predetermined value is added to the count value of the programmable counter to produce a summed value and the programmable counter is updated with the summed value. A cell loss counter increments its count value in response to each cell that is discarded from the buffer within the time window. A decision circuit produces a low quality signal when the count value of the cell loss counter is greater than a threshold value. <IMAGE></p> |
