Filter
Top Products
WS 2000 Wireless Switch System Reference Guide5-22
Click Apply in the Access Port window to save changes.
Quality of Service Configuration
Disruptions in service in a wireless environment can be a significant issue in environments that have high bandwidth
demands (for example, when VoIP and video broadcasts are commonplace). Wireless Internet users can also suffer
disruptions due to environmental conditions, such as adverse transmission situations or a large number of wireless devices
that affect radio frequency communications. The WS 2000 Wireless Switch allows an administrator to adjust several
parameters that can improve the quality of service (QoS) to wireless users.
Select Wireless --> Wireless QoS from the navigation menu on the left to specify how the bandwidth can be shared, how
to distribute the bandwidth among the WLANs that are in service, or how to prioritize voice and multicast communications.
A higher RTS threshold minimizes RTS/CTS exchanges, consuming less bandwidth for data
transmissions. A disadvantage is less help to nodes that encounter interference and collisions. An
advantage is faster data-frame throughput. Environments with less wireless traffic and contention
for transmission make the best use of a higher RTS threshold.
Beacon Settings
Set the Access Port beacon settings by clicking the
Beacon Settings button.
Beacon Interval
A beacon is a packet broadcast by the adopted Access
Ports to keep the network synchronized. Included in a
beacon is information such as the WLAN service area, the
access-port address, the broadcast destination
addresses, a time stamp, and indicators about traffic and
delivery such as a DTIM.
Specify a beacon interval in units of 1,000 microseconds (K-us). This is a multiple of the DTIM value,
for example, 100 : 10. Increase the DTIM/beacon settings, lengthening the time, to let nodes sleep
longer and preserve their battery life. Decreasing this value (shorten the time) to support
streaming-multicast audio and video applications that are jitter-sensitive.
DTIM Period
A DTIM is periodically included in the beacon frame that is transmitted from adopted Access Ports.
The DTIM period determines how often the beacon contains a DTIM, for example, 1 DTIM for every
10 beacons. The DTIM indicates that broadcast and multicast frames, buffered at the Access Port,
are soon to arrive. These are simple data frames that require no acknowledgment, so nodes
sometimes miss them.
In this field, the administrator can specify a period for the Delivery Traffic Indication Message
(DTIM). This is a divisor of the beacon interval (in milliseconds); for example, 10 : 100. Increase the
DTIM/beacon settings, lengthening the time, to let nodes sleep longer and preserve their battery
life. Decrease this settings (shortening the time) to support streaming-multicast audio and video
applications that are jitter-sensitive.
Secure Beacon
Select the Secure Beacon checkbox if the WLAN associated with the Access Port needs to be
secure. If this feature is selected, the WLAN will not broadcast the ESSID. This selection eliminates
the possibility of hackers tapping in to the WLAN without authorization by “stealing” the ESSID.
Click Ok when finished setting the beacon settings.