• Routing Beacon MCS: Select the MCS that routing beacons are sent at. Higher MCS values require
less network overhead and may be beneficial for larger networks. The drawback is that the link
will break when the Routing Beacon MCS can no longer be supported.
• Training Symbols: This setting improves performance in high mobility scenarios where the
wireless channel may change rapidly. Setting this value to an unnecessarily high value may have
an impact as high as 25 percent on overall achievable throughput.
• Burst Time: The burst time determines the maximum amount of time each node is allowed to
transmit at once. A larger burst time will provide higher throughput at the cost of higher latency.
On the other hand, a smaller burst time will provide less latency at the cost of less throughput.
• Fragmentation Threshold: Allows user to determine the minimum over-the-air packet size in
bytes. Smaller packet size can improve performance in high mobility while a larger packet size will
allow for more throughput. (1600 bytes default).
• Retransmissions: You can enable or disable retransmissions here.
• MCS: Choose the modulation and coding scheme (MCS). If this is set as AUTO, the radio will
dynamically cycle between a subset of the modes depending on the quality of the link. This is
the recommended setting for most users and will provide the maximum data rate that the link
can support. The EXTENDED AUTO mode includes 64QAM rate modes on top of those included
in the AUTO mode. Table 18 below show the estimated UDP data rate and sensitivity for each
MCS. This table assumes a 5000 meter link distance, 10ms burst time, and 1600 byte
fragmentation threshold.
• GI Mode: This feature can be used to improve performance in environments where long delay
spread is present and causing intersymbol interference*. This setting allows the radio to vary its
Guard Interval** to allow for longer delay spread. When set to ‘Extended Auto – GI’, the radio
will choose between the regular GI, and the user specified longer GI (Cyclic Prefix Length in the
next setting) depending on channel conditions. Delay spread is often seen in environments
where there are high rise buildings with metal, glass, cement, or other material with a high
potential for reflections. Using a low GI mode will allow more time used sending data and
therefore give you more throughput, however a higher GI mode will give you less chance of
seeing loss due to delay spread. Below are some criteria for when you might want to increase
the amount of guard interval:
o Reported loss rate is high
o Interference is not the cause of high loss rate
o Environment radios are deployed in has the potential for RF reflections
You will know that you have reach a more appropriate GI mode if the loss rate decreases after
adjusting.
*(https://en.wikipedia.org/wiki/Intersymbol_interference)
**(https://en.wikipedia.org/wiki/Guard_interval)
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