Aastra 400 Series - System Characteristics

System characteristics
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Planning Aastra 400 DECT systems as of R1.0
syd-0457/1.0 – R1.0 – 10.2012
4 System characteristics
4. 1 Radio characteristic of a radio unit
The coverage range of a radio unit depends among other things on the antenna
through which the radio signal is transmitted. The radio units transmit through two
integrated antennas inside the housing. The radio characteristic of internal anten-
nas is virtually spherical (with only transmission to the rear slightly diminished), in
other words registered cordless phones are able to move away from the radio unit
the same distance in every direction without the radio signal breaking up. This
does not take account of the topology that attenuates the signal’s propagation.
Fig. 5 Spherical radio characteristic of a DECT radio unit
The radio characteristic within the area to be covered is influenced by the objects
and materials located in the buildings. The spherical radio characteristic is there-
fore deformed accordingly depending on local circumstances.
Fig. 6 Radio characteristic through obstacles to radio propagation