3Com 9550, 9150 manual Ack-Policy, Setting Description

46Service

Ack-Policy

When the Ack-Policy is checked. The device will not send ACK frames. The default value is disabled.

Setting	Description
Min Contention	For each access category, enter the minimum
Window	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.
Max Contention	For each access category, enter the maximum
Window	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.
Fixed Slot Time	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.
Transmit	Enter the number of microseconds that qualified
Opportunity Limit	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.