| 摘要 |
<p>To realize the traffic control for controlling occurrence of congestion in an ATM switchboard and assuring the throughput of VCs using the same output port. A buffer occupancy value measuring section measures the queue length of each of output port buffers and stores the data in a buffer occupancy value table. A back-pressure outputting section outputs a transmission restart signal when a queue length in the buffer occupancy table is equal to or less than a first threshold, a transmission control signal when the queue length is between the first threshold and a second threshold, and a transmission stop signal when the queue length is equal to or more than the second threshold as back pressure signal respectively. A cell transmission control section transmits an ATM cell without comparing a transmission time with the present time when the instruction of a back pressure signal corresponding to a destination port indicates "restart" and transmits an ATM cell only when the transmission time is earlier than the present time if the instruction indicates "control".</p> |
