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8.4. ABOUT 2.4 GH
Z
WIRELESS COMPONENTS ON-SITE PLACEMENT
Important!
The system wireless networks’ ability to automatically select a data transfer route
to the Control Panel through a large number of retransmission levels makes
wireless device installation completely independent from the complexity of the
facility, quantified by the number of obstacles for wireless signal propagation
(walls, intermediate floors, etc.). Thus, it is possible to cover long corridor
structures of large buildings such as hotels, medical institutions, industrial
facilities, etc.
The nature of radio signal propagation has little effect on layout of system components,
i.e. devices may be placed in those locations defined at a design stage. This is achieved
by the ability of free introducing of more routers than originally designed into the
retransmission circuit. The mechanism for introducing such is quite simple: just register
the additional router in the wireless network and place it between the components with
problematic connection. An automatic wireless
network functioning algorithms “integrate”
new component creating new routes without subjective interference.

The average communication range between a detector and wireless network
coordinator or a detector and a router is approximately 15-20 meters with 2 dry
walls of 1 brick thick (partitions between rooms) or one industrial reinforced
concrete intermediate floor of up to 40 cm thick.

The average communication range between a router and wireless network
coordinator or a router and another router is approximately 20-50 meters with 3
dry walls 1 brick thick (walls between rooms) or one industrial reinforced
concrete intermediate floor of up to 40 cm thick, combined with one dry wall of 1
brick thick.

Facility construction materials such as glass or dry wood (with final water content
of 5-8%) do not significantly decrease wireless communication range; therefore,
the average distance on the “detector – wireless network coordinator” or
“detector – router” line may be up to 50-100 meters, and a distance on the
“router – wireless network coordinator” or “router – router” line may be of up to
350-400 meters.

Metal reinforcing mesh structures (in reinforced concrete or plaster) do not cause
significant attenuation of wireless signals until the linear dimensions of
structural cells or their projection onto a plane perpendicular to the propagation
axis is greater than the wavelength in the range of 2.4 GHz: 12.5 cm.
When selecting wireless device installation locations, observe the requirements that follow
from the physical laws that are the basis for the operation of all types of wireless
devices: