WIRELESS
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
104
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
104
HITRON CGN USER’S GUIDE
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.
TXOP
This field defines the Transmission Opportunity (TXOP)
length for each Access Category. This is the length of
time during which the wireless device may to transmit
over the wireless network, once it receives a
transmission opportunity.
ACM
This field specifies whether Admission Control is
Mandatory (ACM) for each Access Category. Select the
checkbox to have the CGN control ACM.
Table 30:
The Wireless > Advanced > WMM Configuration Screen
