Preventive Maintenance Guidelines
Thermo Fisher Scientific Smart-Vue Administrator Manual 25
repeater, and 100 to 400 meters (330 to 1300 ft) using up to three
repeaters. Variations in range are due to mostly to obstacles in the
environment.
2.1.2.2 Radio wave propagation In order to setup wireless network architecture, it is useful to keep in
mind some of the basics of Hertzian radio wave propagation, particularly
when setting up repeaters to achieve optimal range. The uninhibited
propagation speed for waves in a vacuum is 3.10
8
m/s. In all other
environments, signals are attenuated by absorption, reflection, refraction,
and diffraction.
2.1.2.3 Radio wave absorption When a radio wave encounters an obstacle, part of its energy is absorbed
and transformed into lost energy, while part continues to propagate in an
attenuated manner. Part may also be reflected. Signal attenuation during
transmission is referred to as power loss. Attenuation increases with
distance. In addition, when radio waves collide with obstacles, the
attenuation value depends largely on the obstacle’s composition. Metallic
obstacles generally reflect radio waves strongly, while water absorbs the
signal.
Note : It is important for the wireless signal strength indicated in
Smart-Vue Client to be 30% or higher. If the signal strength for any given
end-point module or repeater is lower than 30%, then you must try to
reposition end-point modules for better performance or consider using
one or more repeaters to achieve a stronger end-to-end signal.
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