2.6 Determining Distance between Wireless Network Switches
Line of Sight Distances
In line of sight, each NS50 has a maximum wireless range of 300 metres (984 feet) using high gain
directional antennas. NS50 units are generally installed with a 100 metre (328 feet) overlap of the
radio field as shown in Figure 8: Wireless channel layout and distances Distances Around Curves
This ensures sufficient coverage between NS50 units.
NS50 units within range of each other must be configured with different Wi-Fi channels. By default
every fifth channel is used (channels 1, 6 and 11) to prevent signal overlap, minimising the possibility
of inter-modulation or interference.
Figure 8: Wireless channel layout and distances Distances Around Curves
The wireless range of a NS50 decreases when going around curves. In this case, NS50 units need to
be installed closer together to provide sufficient coverage. Distances between NS50 units will vary
depending on the drift and tightness of the curve. They are installed closer together on a tight curve.
Use the following steps to estimate the distance between NS50 units:
1. Install one NS50 unit at the beginning of the curve.
2. Install the second NS50 unit between 20 metres (65 feet) to 40 metres (130 feet) from the
end of the curve.
3. Install and align antennas.
4. Perform a RF signal strength test by walking from the first NS50 to the second NS50.
5. If the strength test records levels of:
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