Users Guide

Dell PowerConnect W-AirWave 7.4 | Configuration Guide Configuration Reference | 131
3. Select Add or Save. The added or edited profile appears on the Profiles > SSID > EDCA Station page.
Profiles > SSID > HT SSID
High-throughput (HT) APs support additional settings not available in legacy APs. A mesh high-throughput
SSID profile can enable or disable high-throughput (802.11n) features and 40 MHz channel usage, and define
values for aggregated MAC protocol data units (MDPUs) and Modulation and Coding Scheme (MCS) ranges.
Dell PowerConnect W provides a “default” version of the mesh high-throughput SSID profile. You can use the
“default” version or create a new instance of a profile which you can then edit as you need. High-throughput
Mesh nodes operating in different cluster profiles can share the same high-throughput SSID radio profile.
Video
Arbitrary Inter-frame
Space Number
2 WMM is an extension to the Carrier Sense Multiple Access with Collision Avoidance
(CSMA/CA) protocol’s Distributed Coordination Function (DCF).
The collision resolution algorithm responsible for traffic prioritization depends on the
following configurable parameters for each AC:
 arbitrary inter-frame space number (AIFSN)
 minimum and maximum contention window (CW) size
Minimum Contention
Window (Exponent)
3
Maximum Contention
Window (Exponent)
4
Transmission Opportunity
Slots in 32 μsec Units
94 For each AC, the backoff time is the sum of the AIFSN and a random value between 0
and the CW value. The AC with the lowest backoff time is granted the opportunity to
transmit (TXOP). Frames with the highest priority AC are more likely to get TXOP as
they tend to have the lowest backoff times (a result of having smaller AIFSN and CW
parameter values). The value of the CW varies through time as the CW doubles after
each collision up to the maximum CW. The CW is reset to the minimum value after
successful transmission.
In addition, you can configure the TXOP duration for each AC.
ACM No Define whether or not admission control mandatory (ACM) is to be supported on APs
configured with this EDCA profile.
Voice
Arbitrary Inter-frame
Space Number
2 WMM is an extension to the Carrier Sense Multiple Access with Collision Avoidance
(CSMA/CA) protocol’s Distributed Coordination Function (DCF).
The collision resolution algorithm responsible for traffic prioritization depends on the
following configurable parameters for each AC:
 arbitrary inter-frame space number (AIFSN)
 minimum and maximum contention window (CW) size
Minimum Contention
Window (Exponent)
2
Maximum Contention
Window (Exponent)
3
Transmission Opportunity
Slots in 32 μsec Units
47 For each AC, the backoff time is the sum of the AIFSN and a random value between 0
and the CW value. The AC with the lowest backoff time is granted the opportunity to
transmit (TXOP). Frames with the highest priority AC are more likely to get TXOP as
they tend to have the lowest backoff times (a result of having smaller AIFSN and CW
parameter values). The value of the CW varies through time as the CW doubles after
each collision up to the maximum CW. The CW is reset to the minimum value after
successful transmission.
In addition, you can configure the TXOP duration for each AC.
ACM No Define whether or not admission control mandatory (ACM) is to be supported on APs
configured with this EDCA profile.
Table 62 Profiles > SSID > EDCA Station Profile Settings (Continued)
Field Default Description