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Wireless Settings
69
Access Categories – WMM defines four access categories (ACs): voice,
video, best effort, and background. These categories correspond to traffic
priority levels and are mapped to IEEE 802.1D priority tags. The direct
mapping of the four ACs to 802.1D priorities is specifically intended to
facilitate inter operability with other wired network QoS policies. While
the four ACs are specified for specific types of traffic, WMM allows the
priority levels to be configured to match any network-wide QoS policy.
WMM also specifies a protocol that access points can use to
communicate the configured traffic priority levels to QoS-enabled
wireless clients.
The following table explains the four access categories:
AIFS (Arbitration Inter-Frame Space) – The minimum amount of wait time
before the next data transmission attempt. Specify the AIFS value in the
range 0-15 microseconds.
CWMax (Maximum Contention Window) – The maximum upper limit of
the random backoff wait time before wireless medium access can be
attempted. The contention window is doubled after each detected
collision up to the CWMax value. Specify the CWMax value in the range
0-15 microseconds. Note that the CWMax value must be greater or equal
to the CWMin value.
Access Category
WMM
Designation
Description
802.1D
Tags
AC_BE (AC0)
Best Effort
Normal priority, medium
delay and throughput. Data
only affected by long delays.
Data from applications or
devices that lack QoS
capabilities.
0, 3
AC_BK (AC1)
Background
Lowest priority. Data with no
delay or throughput
requirements, such as bulk
data transfers.
2, 1
AC_VI (AC2)
Video
High priority, minimum
delay. Time-sensitive data
such as streaming video.
5, 4
AC_VO (AC3)
Voice
Highest priority, minimum
delay. Time-sensitive data
such as VoIP (Voice over IP)
calls.
7, 6
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CWMin (Minimum Contention Window) – The initial upper limit of the
random backoff wait time before wireless medium access can be
attempted. The initial wait time is a random value between zero and the
CWMin value. Specify the CWMin value in the range 0-15 microseconds.
Note that the CWMin value must be equal or less than the CWMax value.
TXOP Limit (Transmit Opportunity Limit) – The maximum time an AC
transmit queue has access to the wireless medium. When an AC queue is
granted a transmit opportunity, it can transmit data for a time up to the
TxOp Limit. This data bursting greatly improves the efficiency for high
data-rate traffic. Specify a value in the range 0-65535 microseconds.
ACM – Admission Control Mode, for the access category. When enabled,
clients are blocked from using the access category. (Default: Disabled)
Ack Policy (WMM Acknowledge Policy) – By default, all wireless data
transmissions require the sender to wait for an acknowledgement from
the receiver. WMM allows the acknowledgement wait time to be turned
off for each Access Category (AC). Although this increases data
throughput, it can also result in a high number of errors when traffic
levels are heavy. (Default: Acknowledge)
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Page 73 / 182
Wireless Settings
71
WDS
The Router supports WDS (Wireless Distribution System). WDS enables
one or more Access Points to rebroadcast received signals to extend
range and reach, though this can affect the overall throughput of data.
Note that WDS implementation can vary from product to product. Hence
there is no guarantee that different products will interoperate. In
addition, the security settings for WDS links should be the same as the
one set up for your wireless clients.
Figure 54
Wireless WDS Settings Screen
1
Check the
Enable WDS Function
checkbox.
2
To refresh the list of available access points, click
Rescan Wireless
Networking.
If the MAC address of the desired APs is in the list of
scanned APs, you can simply check those APs to add them to the WDS.
3
Click
Add
to add the MAC address of the AP to the list, (up to 4 APs can
be added), the add WDS screen will appear (refer to
Figure 55
).
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Figure 55
Add WDS screen
On the add WDS screen, enter the MAC address of the access point, up
to 4 APs can be added to the AP MAC Address table, and click
Apply
.
Here is an example of how to setup two units of 3Com Router over WDS.
Note that when setting up two units of 3Com Router, you should disable
the DHCP function on one of the units.
Setting of the first Router:
■
Set the LAN IP setting, make sure the DHCP function is enabled on this
Router.
■
Set the wireless settings, including SSID, channel, and wireless mode.
■
Set the wireless security setting, and enable wireless WDS function.
Setting of the second Router:
■
Set the LAN IP setting, use a different IP address from the IP address of
the first Router. Disable the DHCP function, this would allow the first
Router to allocate IP address for wireless clients.
■
Set the wireless channel, and security same as the first Router, but use
a different SSID. Make sure that WDS function is enabled.
Access the Web UI of the first Router, use wireless WDS settings screen,
make sure that WDS is enabled. Click Rescan Wireless Networking to
scan the available APs in your area, you should see the SSID of the second
Router. Check and add the second Router to the WDS table
(see
Figure 56
).
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Wireless Settings
73
Figure 56
First Router Add WDS Screen
Access the Web UI of the second Router, repeat the above steps to add
the first Router to the WDS table (see
Figure 57
).
Figure 57
Second Router Add WDS Screen
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