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Chapter 7: Advanced Tab
AirRouter
HP User Guide
Ubiquiti Networks, Inc.
Chapter 7: Advanced Tab
The Advanced tab handles advanced routing and wireless
settings. The advanced wireless settings should be used
by technically advanced users who have a sufficient
knowledge about wireless LAN technology. These settings
should not be changed unless you know the effect the
changes will have on your AirRouter HP.
Advanced Wireless Settings
The 802.11n data rates include MCS0, MCS1, MCS2, MCS3,
MCS4, MCS5, MCS6, MCS7 for 1x1 chain devices and MCS8,
MCS9, MCS10, MCS11, MCS12, MCS13, MCS, MCS15 for
2x2 chains devices. The ACK timeout has a critical impact
on performance in 802.11n outdoor links.
RTS Threshold
Determines the packet size of a
transmission and, through the use of an access point,
helps control traffic flow. The range is 0-2346 bytes, or
word “off”. The default value is 2346 which means that RTS
is disabled.
RTS/CTS (Request to Send/Clear to Send) are the
mechanisms used by the 802.11 wireless networking
protocol to reduce frame collisions introduced by the
hidden terminal problem. RTS/CTS packet size threshold is
0-2346 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.
The system uses a 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 a time interval defined during
which all other stations hold off transmission and wait
until the requesting station finishes transmission.
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