Hitron CGN2 User Manual page 105

Table 30: The Wireless > Advanced > WMM Configuration Screen
AckPolicy
WMM Parameters of Station
NOTE: This section controls the parameters of data transmitted from the wireless
clients to the CGN2.
AC_BE
AC_BK
AC_VI
AC_VO
AIFSN
CWMin
CWMax
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HITRON CGN2 USER'S GUIDE
WMM defines two ACK policies: NormalAck and NoAck.
NormalAck: the recipient of a transmission

acknowledges each received packet.
NoAck: the recipient of a transmission does not

acknowledge received packets. This can improve
data throughput in situations where signal quality is
excellent, but in other situations can cause a
significant increase in lost packets.
Select the checkbox to use the NoAck policy.
This row controls the Best Effort (BE) Access Category
(AC)
This row controls the Background (BK) Access Category
(AC)
This row controls the Video (VI) Access Category (AC)
This row controls the Voice (VO) Access Category (AC)
This column controls the Arbitration Inter-Frame Space
Number for each Access Category. WMM gives the
highest priority to the AC with the lowest AIFSN.
This column controls the Contention Window Minimum
for each Access Category. A smaller CWMin value
increases priority for data of the relevant type.
The contention window system is a mechanism for
providing priority to important data on the wireless
network. When a data collision occurs, each frame is
assigned a random time to wait before attempting
transmission again. This random time value is between
zero and the data's CWMin value. If a collision occurs
again, the time value is doubled, and transmission is
attempted again. This continues until the time value
reaches the CWMax value.
This column controls the Contention Window Maximum
for each Access Category. A smaller CWMin value
decreases the access delay for data of the relevant
type, but can result in more data collisions.
Version 2.0, February 2012. Copyright
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
2012 Hitron Technologies