3Com 3CRWE915075 User Guide - Page 50
Ack-Policy, When the Ack-Policy is checked. The device will not send ACK
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46 Service Ack-Policy When the Ack-Policy is checked. The device will not send ACK frames. The default value is disabled. Setting Min Contention Window Max Contention Window Fixed Slot Time Transmit Opportunity Limit Description For each access category, enter the minimum contention window value. Channel access is prioritized by assigning smaller contention window values to a higher priority traffic class. If a channel is busy or a transmission collides, a node chooses a random number between 0 and the current contention window minimum. For each access category, enter the maximum contention window value. The minimum contention window value is doubled each time a collision occurs until the maximum is reached. A small contention window value decreases the access delay but increases the probability of a collision. For each access category, enter the fixed slot time. Channel access can be strictly prioritized by assigning smaller contention window values to a higher priority traffic class. Traffic in the access category must wait for this fixed number of slots after each packet is received before resuming its random back-off. Enter the number of microseconds that qualified transmitters can transmit through the normal back-off procedure with a set of pending packets. Larger values allow a client to control the channel for longer periods of time, allowing it to achieve higher throughput in this access category at the expense of longer access times for all access categories.