Draytek VigorAP 900 User Manual page 158

Txop
ACM
AckPolicy
After finishing this web page configuration, please click OK to save the settings.
VigorAP 900 User's Guide
the time delay for WMM accessing categories. The difference
between AC_VI and AC_VO categories must be smaller;
however, the difference between AC_BE and AC_BK categories
must be greater.
It means transmission opportunity. For WMM categories of
AC_VI and AC_VO that need higher priorities in data
transmission, please set greater value for them to get highest
transmission opportunity. Specify the value ranging from 0 to
65535.
It is an abbreviation of Admission control Mandatory. It can
restrict stations from using specific category class if it is
checked.
Note: VigorAP 900 provides standard WMM configuration in
the web page. If you want to modify the parameters, please refer
to the Wi-Fi WMM standard specification.
"Uncheck" (default value) the box means the AP will answer the
response request while transmitting WMM packets through
wireless connection. It can assure that the peer must receive the
WMM packets.
"Check" the box means the AP will not answer any response
request for the transmitting packets. It will have better
performance with lower reliability.
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