Much like Ethernet, the existing wireless technology was
developed for use outside of industry and no considerations for
real-time response or determinism are inherent in the media.
Wireless faces additional challenges that need to be addressed
for industrial application [32]. Wireless is highly susceptible
to interference from a variety of sources, which causes transmission
errors. Within the transmission channel itself, effects
such as multi-path fading and intersymbol interference are
present. Interference from other transmission channels is also
possible, such as might occur at the boundaries between two
wireless fieldbusses.