H3C Technologies H3C MSR 50 - Manual (Page 148)

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Item Description
AIFSN Arbitration inter-frame spacing number used by clients.
TXOP Limit Transmission opportunity limit used by clients.
ECWmin Exponent form of CWmin used by clients.
ECWmax Exponent form of CWmax used by clients.
CAC
Enable CAC.
• Enable—Enables CAC.
• Disable—Disables CAC.
AC-VO and AC-VI support CAC, which is disabled by default. This item is not
available for AC-BE or AC-BK, because they do not support CAC.
Table 73 Default EDCA parameters for clients
AC TXOP Limit AIFSN ECWmin ECWmax
AC-BK 0 7 4 10
AC-BE 0 3 4 10
AC-VI 94 2 3 4
AC-VO 47 2 2 3
ECWmin cannot be greater than ECWmax.
If all clients operate in 802.11b radio mode, you are recommended to set TXOPLimit to 188 and 102 for
AC-VI and AC-VO.
If some clients operate in 802.11b radio mode and some clients operate in 802.11g radio mode in the
network, the TXOPLimit parameters in Table 73 are recommended.
Once you enable CAC for an AC, it is enabled automatically for all ACs with higher priority. For example,
if you enable CAC for AC-VI, CAC is also enabled for AC-VO. However, enabling CAC for AC-VO does
not enable CAC for AC-VI.
Displaying radio statistics
1. Select Interface Setup > Wireless > Wireless QoS from the navigation tree.
2. Click the Radio Statistics tab.
3. Click a radio to see its details.