Operating Environment And Radio Waves - Mitsubishi NZ2WL-US User Manual

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 it allowed to use wireless devices at the installation location?
In some medical institutions and laboratories, radio-sensitive precision instruments are used and
it may be prohibited to use wireless devices.
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 and 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 does not increase by slightly moving the position of the
product, it means that the radio waves may be being attenuated by distance or obstacles.
Pay attention to radio interference.
Radio interference means that radio waves in the frequency band used by this network occurred outside
the network this product belongs to and that the reception of the radio waves is affected. Listed below
are major examples of sources of interfering radio waves generated in general environments other than
plants and factories:
- 5GHz (using IEEE802.11a) or 2.4GHz (using IEEE802.11b/IEEE802.11g) band wireless networks
that do not comply with IEEE802.11
- Using IEEE802.11b/IEEE802.11g. (e.g. electronic devices that give off 2.4GHz band radio waves,
such as microwave ovens, security gates installed near entrances of some shops, and copiers)
When 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 giving great effect to the network performance. Rarely, however, communication speed is
decreased and communication is disabled temporarily in the worst case. In such cases, changing the
location of this product may solve the problem.
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4. Wireless Link Mode and Wireless LAN Function
25