(Revised 2013-23-10)
Page 44 of 62
Advanced Wireless Settings
RTS Threshold
: determines the packet size of a transmission and, through the use of an access point, helps
control traffic flow. The valid range is 0-2347bytes, or “off”. The default value is 2347 which means 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 octets. If the packet size the node wants to transmit is
larger than the threshold, the RTS/CTS handshake is triggered. If the packet size is equal to or less
than threshold the data frame is sent immediately
Fragmentation Threshold
: specifies the maximum size of a packet before data is fragmented into multiple
packets. The valid range is 256-2346 bytes, or the word “off”. Setting the Fragmentation Threshold too low
may result in poor network performance. Only minor modifications of this value are recommended, the
default setting of 2346 should remain in most cases.
The use of fragmentation can increase the reliability of frame transmissions. Because sending
smaller frames, collisions are much less likely to occur. The fragment size should typically be set
between 256 and 2,048 bytes.
Acknowledgment Timeout
N-Tron 702-W has an auto-acknowledgment timeout algorithm which dynamically optimizes the
acknowledgment timeout value without user intervention. This is a critical feature required for stabilizing
long-distance outdoor links. The user has the ability to enter the value manually, but this is not
recommended.
Distance:
specify the distance value in miles using slider or enter the value manually. The signal strength
and throughput falls off with range. Changing the distance value will change the ACK Timeout to the
appropriate value of the distance. The ACK timeout is calculated in microseconds and should take into
consideration the round trip flight time over the air.
ACK Timeout
: specify the ACK Timeout. This is the amount of time the subscriber station will wait to
hear an acknowledgment response from the wireless device after the data packet is transmitted. If the
timeout is set too short or too long, it will result in poor connection and throughput performance.
Changing the ACK Timeout value will change the Distance to the appropriate distance value for the
ACK Timeout.
The Auto Adjust control will enable the ACK Timeout Self-Configuration feature. If enabled, the
ACK Timeout value will be derived dynamically using an algorithm similar to the Conservative Rate
Algorithm described above.
Short Guard Interval:
The Guard Interval is used in 802.11n mode and specifies a period of time between
symbol transmissions. Enabling this setting shortens the interval to 400ns (short) from 800ns (long) and
adds approximately 10% to the achievable data rate. For example, choosing the Guard Interval along with
40 MHz channel will allow for a max rate of 300 Mbps instead of 270 Mbps.
