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WS 2000 Wireless Switch System Reference Guide5-18
Set Rates
Click the Set Rates button to open a sub-screen where
the default Basic Rates and Supported Rates for
802.11b/g Access Ports can be set.
A list of available Basic and Supported rates for the
radio are listed in two columns with checkboxes next
to each rate. Selecting a rate as a Basic Rate
automatically selects that rate as a Supported Rate
and disables the option in the Supported Rates
column.
Beacon Settings
Set the Access Port beacon settings by clicking on the
Beacon Settings button.
Set the following beacon values.
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.
Primary WLAN—Select the primary WLAN when the 802.11a broadcast protocol is used. When a
WLAN is associated with a 801.11a broadcaster, only one ESSID can be broadcast from the Access
Port (even though three are supported by the switch). This field specifies which ESSID to broadcast.
Security Beacon—Check the Security Beacon box 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.