Contec FXA3000 Series, Руководство пользователя, Страница: 81 / 113

5. Wireless Link Mode and Wireless LAN Function
74 FXA3000 Series
Operating Environment and Radio Waves
When using this product to construct a network, install and operate it considering the radio environment
to optimize the performance.
Is allowed to use radio equipment at the installation location?
In some medical institutions and laboratories, radio-sensitive precision instruments are used and it may be
prohibited to use radio equipment.
Radio waves are attenuated.
Although a radio wave is attenuated naturally as it travels from its transmission source, it may also be
attenuated by an object existing in its way. Major obstacles that attenuate radio waves are as follows
:
- Concrete wall
- Metal surfaces in the vicinity of the antenna
Obstacles blocking radio waves include metal walls and walls containing a metal firewall.
Strictly speaking, nearly all objects in the path of the radio waves (such as partitions or people) cause
some attenuation but these do not have a significant impact on network performance.
RSSI (Receive Signal Strength Indication) utility is available as a means of knowing the signal strength of
an incoming radio wave. Placing this product for a greater RSSI value makes the communication state
more stable. If the RSSI value is small and slightly moving the position of the product does not increase
the RSSI value, it indicates radio wave attenuation either to the distance or by an obstacle.