Configuring Advanced Settings
D-Link Unified Wired and Wireless Access System
Oct. 2015 Page 624
D-Link UWS User Manual
Command Buttons
The page includes the following buttons:
• Submit—Updates the switch with the values you enter. To retain the new values across a power cycle,
you must perform a save (Tool > Save Changes).
• Refresh—Updates the page with the latest information.
Access Point Profile TSPEC Configuration
From the Access Point Profile TSPEC Configuration page, you can configure traffic specification (TSPEC)
settings for the access points that use this profile.
TSPEC incorporates QoS features into the wireless network to help wireless clients make sure time- and delay-
sensitive network traffic, such as video and voice, have priority over other type of traffic. Examples of wireless
clients that might use this feature include a Wi-Fi Certified telephone handset that marks its codec-generated
data packets as voice priority traffic, or a video player application on a wireless laptop that prioritizes a video
conference feed from a corporate server.
Configure the settings on the Access Point Profile TSPEC Configuration page to determine how an AP handles
the TSPEC sent from a QoS-capable wireless client.
cwMin
(Minimum Contention
Window)
This parameter is used by the algorithm that determines the initial random
backoff wait time (window) for data transmission during a period of contention
for
The value specified in the Minimum Contention Window is the upper limit (in
milliseconds) of a range from which the initial random backoff wait time is
determined.
The first random number generated will be a number between 0 and the
number specified here.
If the first random backoff wait time expires before the data frame is sent, a
retry counter is incremented and the random backoff value (window) is
doubled. Doubling will continue until the size of the random backoff value
reaches the number defined in the Maximum Contention Window.
cwMax
(Maximum Contention
Window)
The value specified in the Maximum Contention Window is the upper limit (in
milliseconds) for the doubling of the random backoff value. This doubling
continues until either the data frame is sent or the Maximum Contention
Window size is reached.
Once the Maximum Contention Window size is reached, retries will continue
until a maximum number of retries allowed is reached.
TXOP Limit Station EDCA Parameter Only (The TXOP Limit applies only to traffic flowing
from the client station to the access point.)
The Transmission Opportunity (TXOP) is an interval of time when a WME client
station has the right to initiate transmissions onto the wireless medium (WM).
This value specifies (in milliseconds) the Transmission Opportunity (TXOP) for
client stations; that is, the interval of time when a WMM client station has the
right to initiate transmissions on the wireless network.
Table 357: QoS Settings (Cont.)
Field Description
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