D-Link DWC-1000 User Manual page 82

Wireless Controller
Short Guard Interval: 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:
Space Time Block Code: 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 rec eiving system has a better
chance of detecting at least one of the data streams. Select one of the
following options:
Radio Resource Management: 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.
No ACK: Select Enable to specify that the AP should not acknowledge frames
with QoS-NoAck as the service class value.
Multicast Tx Rate (Mbps): 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.
•
Enable: The AP transmits data using a 400 ns guard Interval when
communicating with clients that also support the 400 ns guard
interval.
•
Disable: The AP transmits data using an 800 ns guard interval.
•
Enable: The AP transmits the same data stream on multiple
antennas at the same time.
•
Disable: The AP does not transmits the same data on multiple
antennas.
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User Manual