Siemens Desigo TRA Engineering, Mounting And Installation Manual page 79

STEP 3:
Draw range circles
Siemens
Building Technologies
The center of the circle represents the ideal position for RF gateways.
This allows for a shield-free connection in all corners of the fire protection section
(possible sensor positions).
Real-world experience suggests that unfavorable conditions and shortcomings are
commonplace. Planning at 10-12 meter radiuses provide a high level of security;
against future changes to environmental changes as well (light walls, furniture,
personnel in the room, etc.). One meter either way for the gateway position is not
an issue due to reserves, even later.
A very robust RF system can be achieved by implementing a redundant RF
reception path. This can be accomplished by programming neighboring RF
gateways for parallel reception of the RF transmitter.
Even if carefully planned, the field strength measuring device should be used on
site to test ranges. Unfavorable conditions can be improved through more suitable
re-positioning of the devices or through the use of a repeater.
Desigo TRA Engineering, mounting and installation
EnOcean RF networks
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