SB3000 & BR3000 Series User
’
s Manual
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Rev. 1.1 (July, 2012)
103
12.
Appendix C- Advanced Settings
This section provides more explanation on advanced setting for routing and wireless settings.
The Advanced options page allows you to manage advanced settings that influence on the device
performance and behavior. The advanced wireless settings are dedicated for more technically advanced
users who have a sufficient knowledge about wireless LAN technology. These settings should not be
changed unless you know what effect the changes will have on your device.
12.1 Advanced Wireless Setting
The 802.11a/g data rates include 6, 9, 12, 18, 24, 36, 48, 54Mbps.
The 802.11n data rates are the MCS (Modulation Coding Scheme ) rates.
MCS0 to MCS7
are 802.11n rates, which uses only 1 Tx/Rx stream.
MCS8 to MCS15
are 802.11n rates, which uses 2 Tx/Rx streams.
The Rate Algorithm has a critical impact on performance in outdoor links as generally lower data rates are
more immune to noise while higher rates are less immune, but are capable of higher throughput.
Rate Aggressiveness :
Allows user to reduce or increase transmit rate while still remain in Fully Auto Algorithm. There are 2
scenarios that Rate Aggressiveness is useful. Environment might be noisy at times. Lower the throughput
will ensure better stability. Rate Aggressiveness allows device to reduce the transmit rate, so range or
power can be higher. Choose a range of value from -3,-2,-1.
Environment might be free of interference. But the fully auto algorithm might give low throughput.
Increase Rate Aggressiveness will increase transmit rate in this case to get higher throughput.
Choose a range of value from +3, +2, +1.
Noise Immunity
option increases the robustness of the device to operate in the presence of noise
disturbance which is usually generated by external 802.11 traffic sources, channel hopping signals and
other interferes.
RTS Threshold:
determines the packet size of a transmission and, through the use of an access point,
helps control traffic flow. The range is 0-
2347bytes, or word “off”. The default value is
2347 which means that RTS is disabled.
RTS/CTS (Request to Send / Clear to Send) is the mechanism used by the 802.11 wireless networking
protocol to reduce frame collisions introduced by the hidden terminal problem.
RTS/CTS packet size threshold is 0-2347 bytes. If the packet size the node wants to transmit is larger
than the threshold, the RTS/CTS handshake gets triggered. If the packet size is equal to or less than
threshold the data frame gets sent immediately.
System uses Request to Send/Clear to Send frames for the handshake which provide collision reduction
for access point with hidden stations. The stations are sending a RTS frame first while data is send only
after handshake with an AP is completed. Stations respond with the CTS frame to the RTS which
provides clear media for the requesting station to send the data. CTS collision control management has
time interval defined during which all the other stations hold off the transmission and wait until the
requesting station will finish transmission.
Fragmentation Threshold:
specifies the maximum size for a packet before data is fragmented into
multiple packets. The range is 256-
2346 bytes, or word “off”. Setting the Fragmentation
Summary of Contents for AirEther BR3000 Series
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