Dell PowerConnect W-Airwave W-Airwave 7.2 Configuration Guide - Page 115

Profiles > SSID > EDCA AP, WMM Access Category, Description, 1d Tag, Field, Default

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Table 48 Profiles > SSID Profile Settings (Continued) Field Default Description BC/MC Rate No Optimization Enables or disables scanning of all active stations currently associated to a mesh point to select the lowest transmission rate based on the slowest connected mesh child. When enabled, this setting dynamically adjusts the multicast rate to that of the slowest connected mesh child. Multicast frames are not sent if there are no mesh children. NOTE: Dell PowerConnect W recommends using the default value. Strict Spectra- No link Voice Protocol (SVP) Use this setting for SpectraLink VoIP devices. This setting automatically permits and prioritizes the SpectraLink Voice Protocol (SVP). 802.11g Beacon Rate Sets the beacon rate for 802.11a (use for Distributed Antenna System (DAS) only). CAUTION: Using this parameter in normal operation may cause connectivity problems. 802.11a Beacon Rate Sets the beacon rate for 802.11g (use for Distributed Antenna System (DAS) only). CAUTION: Using this parameter in normal operation may cause connectivity problems. 3. Select Add or Save. The added or edited profile appears on the Profiles > SSID page. Profiles > SSID > EDCA AP Wireless Multimedia (WMM) provides media access prioritization through Enhanced Distributed Channel Access (EDCA). EDCA defines four access categories (ACs) to prioritize traffic: voice, video, best effort, and background. These ACs correspond to 802.1d priority tags, as shown in Table 49. Table 49 WMM Access Categories and 802.1d Tags WMM Access Category Description 802.1d Tag Voice Highest priority 7, 6 Video Prioritize video traffic above other data traffic 5, 4 Best Effort Traffic from legacy devices or traffic from applications or devices that do 0, 3 not support QoS Background Low priority traffic (file downloads, print jobs) 2, 1 While the WMM ACs designate specific types of traffic, you can determine the priority of the ACs. For example, you can choose to give video traffic the highest priority. With WMM, applications assign data packets to an AC. In the client, the data packets are then added to one of the transmit queues for voice, video, best effort, or background. 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 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. Dell PowerConnect W AirWave 7.2 | Configuration Guide Dell PowerConnect W Configuration Reference | 115

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Dell PowerConnect W AirWave 7.2
| Configuration Guide
Dell PowerConnect W Configuration Reference
|
115
3.
Select
Add
or
Save
.
The added or edited profile appears on the
Profiles > SSID
page.
Profiles > SSID > EDCA AP
Wireless Multimedia (WMM) provides media access prioritization through Enhanced Distributed Channel
Access (EDCA). EDCA defines four access categories (ACs) to prioritize traffic: voice, video, best effort, and
background. These ACs correspond to 802.1d priority tags, as shown in
Table 49
.
While the WMM ACs designate specific types of traffic, you can determine the priority of the ACs. For example,
you can choose to give video traffic the highest priority. With WMM, applications assign data packets to an AC.
In the client, the data packets are then added to one of the transmit queues for voice, video, best effort, or
background.
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
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.
BC/MC Rate
Optimization
No
Enables or disables scanning of all active stations currently associated to a mesh point to
select the lowest transmission rate based on the slowest connected mesh child. When
enabled, this setting dynamically adjusts the multicast rate to that of the slowest connected
mesh child. Multicast frames are not sent if there are no mesh children.
NOTE:
Dell PowerConnect W recommends using the default value.
Strict Spectra-
link Voice
Protocol (SVP)
No
Use this setting for SpectraLink VoIP devices. This setting automatically permits and
prioritizes the SpectraLink Voice Protocol (SVP).
802.11g Beacon
Rate
Sets the beacon rate for 802.11a (use for Distributed Antenna System (DAS) only).
CAUTION: Using this parameter in normal operation may cause connectivity problems.
802.11a Beacon
Rate
Sets the beacon rate for 802.11g (use for Distributed Antenna System (DAS) only).
CAUTION: Using this parameter in normal operation may cause connectivity problems.
Table 49
WMM Access Categories and 802.1d Tags
WMM Access Category
Description
802.1d Tag
Voice
Highest priority
7, 6
Video
Prioritize video traffic above other data traffic
5, 4
Best Effort
Traffic from legacy devices or traffic from applications or devices that do
not support QoS
0, 3
Background
Low priority traffic (file downloads, print jobs)
2, 1
Table 48
Profiles > SSID Profile Settings
(Continued)
Field
Default
Description