D-Link DWS 3000 QoS Settings, Queue, Data 0 Voice, Data 1Video, Data 2 best effort, CwMin, Window

8 Configuring Advanced Settings

Table 55 describes the QoS settings you can configure.

Table 55. QoS Settings

Field	Description
Queue	Queues are defined for different types of data transmitted from AP-to-
	station:
	Data 0 (Voice)
	High priority queue, minimum delay. Time-sensitive data such as VoIP
	and streaming media are automatically sent to this queue.
	Data 1(Video)
	High priority queue, minimum delay. Time-sensitive video data is
	automatically sent to this queue.
	Data 2 (best effort)
	Medium priority queue, medium throughput and delay. Most traditional
	IP data is sent to this queue.
	Data 3 (Background)
	Lowest priority queue, high throughput. Bulk data that requires
	maximum throughput and is not time-sensitive is sent to this queue
	(FTP data, for example).
AIFS	The Arbitration Inter-Frame Spacing (AIFS) specifies a wait time (in
(Inter-Frame Space)	milliseconds) for data frames.
	Valid values for AIFS are 1 through 255.
cwMin	This parameter is input to the algorithm that determines the initial
(Minimum Contention	random backoff wait time ("window") for retry of a transmission.
Window)	The value specified here in the Minimum Contention Window is the
	upper limit (in milliseconds) of a range from which the initial random
	backoff wait time is determined.
	The first random number generated will be a number between 0 and the
	number specified here.
	If the first random backoff wait time expires before the data frame is
	sent, a retry counter is incremented and the random backoff value
	(window) is doubled. Doubling will continue until the size of the
	random backoff value reaches the number defined in the Maximum
	Contention Window.
	Valid values for the “cwmin” are 1, 3, 7, 15, 31, 63, 127, 255, 511, or
	1024. The value for “cwmin” must be lower than the value for “cwmax”.
cwMax	The value specified here in the Maximum Contention Window is the
(Maximum Contention	upper limit (in milliseconds) for the doubling of the random backoff
Window)	value. This doubling continues until either the data frame is sent or the
	Maximum Contention Window size is reached.
	Once the Maximum Contention Window size is reached, retries will
	continue until a maximum number of retries allowed is reached.
	Valid values for the “cwmax” are 1, 3, 7, 15, 31, 63, 127, 255, 511, or
	1024. The value for “cwmax” must be higher than the value for
	“cwmin”.

Configuring QoS 157