| 摘要 |
A component device (such as an input circuit interface device, a cell multiplexing device, a cell switching device, a cell demultiplexing device or output circuit interface device) in an ATM exchange counts an inflow cell number, a passage cell number and discard cell number. The firmware of the device subtract the passage cell number and the discard cell number from the inflow cell number to find a difference at predetermined interval. If the difference is larger than the predetermined threshold value, the firmware informs the software of fault warning.
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