WIRELESS
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
105
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
105
HITRON CGN USER’S GUIDE
AckPolicy
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.
WMM Parameters of Station
NOTE:
This section controls the parameters of data transmitted from the wireless
clients to the CGN.
AC_BE
This row controls the Best Effort (BE) Access Category
(AC)
AC_BK
This row controls the Background (BK) Access Category
(AC)
AC_VI
This row controls the Video (VI) Access Category (AC)
AC_VO
This row controls the Voice (VO) Access Category (AC)
AIFSN
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.
CWMin
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.
CWMax
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.
Table 30:
The Wireless > Advanced > WMM Configuration Screen
