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WMM assigns each AC a set of EDCA parameters for channel contention, including:
Arbitration Inter Frame Spacing Number (AIFSN): Different from the fixed distributed
inter-frame spacing (DIFS) specified in the 802.11 protocol family, AIFSN varies across ACs. A
greater AIFSN indicates a longer backoff period. See AIFS in the following figure.
Contention window minimum (CWmin) and contention window maximum (CWmax) specify the
average backoff period. The period increases along with these two values. See the backoff slots
in the following figure.
Transmission Opportunity (TXOP): It specifies the maximum channel use duration after
successful channel contention. The duration increases along with this value. The value 0
indicates that a device can send only one packet through a channel after winning contention for
the channel.
The AP offers 3 options for WMM optimization. You can choose the scenario-based (1 – 10 users, or
over 10 users) option and let the AP helps you optimize WMM automatically. Or you can choose
Custom to configure the parameters yourself to meet your very specific requirement.
5.5.2 Configuring scenario-based WMM settings
Select either of the two and let the AP helps you optimize WMM automatically.
To enter the configuration page, choose Wireless > WMM.
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