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HITRON BVW-3653 USER’S GUIDE
WIRELESS
6.5.1
CONFIGURING WMM PARAMETERS
To set up your BVW-3653’s Wifi MultiMedia (WMM) Quality of Service (QoS)
settings, click the
Configuration
button in the
Wireless
>
Advanced
screen. The
following screen displays.
FIGURE 33:
The Wireless > Advanced > WMM Configuration Screen
NOTE:
It is strongly recommended that you do not change the default values in this
screen unless you have a good reason to do so.
Other
HT TxStream
Select the number of 802.11n radio transmitting
channels (
1
or
2
) for High Throughput (HT) transmission.
HT RxStream
Select the number of 802.11n radio receiving channels
(
1
or
2
) for High Throughput (HT) transmission.
Apply
Click this to save your changes to the fields in this
screen.
Cancel
Click this to return the fields in this screen to their last-
saved values without saving your changes.
Help
Click this to see information about the fields in this
screen.
TABLE 31:
The Wireless > Advanced Screen (continued)
Page 87 / 106
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HITRON BVW-3653 USER’S GUIDE
WIRELESS
The following table describes the labels in this screen.
TABLE 32:
The Wireless > Advanced > WMM Configuration Screen
WMM Parameters of Access Point
NOTE:
This section controls the parameters of data transmitted from the BVW-3653
to the wireless clients.
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.
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 BVW-3653 control ACM.
Page 88 / 106
88
HITRON BVW-3653 USER’S GUIDE
WIRELESS
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 BVW-3653.
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 32:
The Wireless > Advanced > WMM Configuration Screen
Page 89 / 106
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HITRON BVW-3653 USER’S GUIDE
WIRELESS
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 wireless client control ACM.
TABLE 32:
The Wireless > Advanced > WMM Configuration Screen
Page 90 / 106
90
HITRON BVW-3653 USER’S GUIDE
WIRELESS

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