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5.2 Wireless System Installation
152 DECT Installation
• The table below shows the transmission tendency of radio waves when they reach objects
made from various materials.
Installation Preparation
1. Prepare a drawing of the building where you want to install the Cell Station (CS).
(A drawing which shows the size or main structural material of the wall, partition wall or
ceiling is preferable.)
2. Consider the service area required for the users.
3. Examine the service area on the drawing.
a) Make a circle around the installable area by determining the radio transmission range
(inside: 25 m – 50 m, outside: 70 m – 100 m). Note that a CS cannot be installed outside
a building.
b) If more than one CS is required, the radio transmission ranges should overlap. The
overlapping range should be at least 5 to 10 meters.
Object Material Transmission Tendency
Wall Concrete The thicker they are, the less radio waves penetrate them.
Ferroconcrete Radio waves can penetrate them, but the more iron there is, the
more radio waves are reflected.
Window Glass Radio waves usually penetrate them.
Glass with wire nets Radio waves can penetrate them, but tend to be reflected.
Glass covered with
heat-resistant film
Radio waves are weakened considerably when they penetrate
windows.
Floor Ferroconcrete Radio waves can penetrate them, but the more iron there is, the
more radio waves are reflected.
Partition Steel Radio waves are reflected and rarely penetrate them.
Plywood, Glass Radio waves usually penetrate them.
Column Ferroconcrete Radio waves can penetrate them, but the more iron there is, the
more radio waves tend to be reflected or diffracted.
Metal Radio waves tend to be reflected or diffracted.
Cabinet Steel Radio waves are usually reflected or diffracted, and rarely
penetrate them.
Wood Radio waves can penetrate them, but they are weakened.