D-Link DWC-1000 User Manual page 112

Section 4 - Advanced WLAN Configuration
Field
Short Guard Interval
Space Time Block Code
Radio Resource
Management
No Ack
Force Roaming
Force Roaming Threshold
Multicast Tx Rate (Mbps)
Auto Eligible Channels
Basic Rate Set (Mbps)
Supported Rate Set (Mbps)
D-Link DWC-1000 User Manual
The guard interval is the dead time, in nanoseconds, between OFDM symbols. The guard
interval prevents Inter‐Symbol and Inter‐Carrier Interference (ISI, ICI). The 802.11n mode
allows for a reduction in this guard interval from the a and g definition of 800 nanoseconds
to 400 nanoseconds. Reducing the guard interval can yield a 10% improvement in data
throughput.
Select one of the following options:
• ON= The AP transmits data using a 400 ns guard Interval when communicating with
clients that also support the 400 ns guard interval.
• OFF= The AP transmits data using an 800 ns guard interval.
Space Time Block Coding (STBC) is an 802.11n technique intended to improve the
reliability of data transmissions. The data stream is transmitted on multiple antennas so
the receiving system has a better chance of detecting at least one of the data streams.
Select one of the following options:
• ON=The AP transmits the same data stream on multiple antennas at the same time.
• OFF=The AP does not transmits the same data on multiple antennas.
Radio Resource Measurement (RRM) mode requires the Wireless System to send
additional information in beacons, probe responses, and association responses.Enable or
disable the support for radio resource measurement feature in the AP profile. The feature
is set independently for each radio and is enabled by default.
Select Enable to specify that the AP should not acknowledge frames with QosNoAck as
the service class value.
Select Enable to detect and disconnect wireless clients based on the client RSSI. If the
client RSSI falls below the roaming threshold value, the client will be disassociated. The
association attempts will be monitored, and if its RSSI is found below the threshold value
in 3 consecutive attempts, the client is disconnected. If still the client tries association for
the 4th time, the association will be logged and allowed to connect.
This value indicates the RSSI reference value which is to be compared with the client RSSI
for Force Roaming feature.
Select the 802.11 rate at which the radio transmits multicast frames. The rate is in Mbps.
The lowest rate in the 5 GHz band is 6 Mbps.
Channel
This field displays the channels that are supported for the radio mode currently selected
on the page and for the country configured on the General Settings page. Press Crtl to
select multiple channels.
These numbers indicate the data rates that all stations associating with the AP must
support.
These numbers indicate rates that the access point supports. You can select multiple
rates. The AP automatically chooses the most efficient rate based on factors like error
rates and distance of client stations from the AP.
Description
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