3 Setup
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FX-DS540-AP, FX-DS540-APP
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:
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Concrete wall
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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.
Pay attention to radio interference.
Radio interference means the reception of radio waves in the frequency band used by this network that
are generated by equipment that is not part of the network to which this product belongs. Listed below
are major examples of sources of interfering radio waves generated in general environments excluding
plants and factories:
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5GHz band wireless networks that do not comply with IEEE802.11
When the FX-DS110-CFC has been installed in the CF2 slot
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2.4GHz band wireless networks that do not comply with IEEE802.11
Non-network sources of radio interference
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Microwave ovens
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Security gates(Installed near the entrances of some department stores and rental shops)
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Copiers
Where there is a large metal wall such as in a warehouse, the radio wave generated from the sender is
reflected, resulting in those radio waves reaching the receiver which have taken different routes (thereby
phase-shifted). This has the similar effect as the generation of interfering radio waves, possibly slowing
down data transfer.
Most of the interfering radio wave sources other than wireless networks have local and/or temporary
effects, not so affecting network performance. Rarely, however, the date rate is reduced and, in the
worst case, communication is disabled temporarily. In such cases, change the location of this product
and the channel used for communication. This may solve the problem.