Draytek Vigor2132 Series User Manual page 373

Txop
ACM
AckPolicy
After finishing all the settings here, please click OK to save the configuration.
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: Vigor2132FVn 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 router 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 router will not answer any
response request for the transmitting packets. It will have
better performance with lower reliability.
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Vigor2132 Series User's Guide