System characteristics
25
Planning Aastra 400 DECT systems as of R1.0
syd-0457/1.0 – R1.0 – 10.2012
Fig. 8 Principle of multipath propagation with DECT signals
Obstacles may include:
• Moving metal objects such as lifts, cranes, carriages, escalators, blinds, especially
ones that are actuated automatically (the influence of such obstacles varies and
is therefore difficult to assess)
• Metal-panelled rooms and large metal-clad objects such as air conditioners,
computer rooms, metallized glassed areas (mirrored), fire protection walls, stor-
age tank installations, refrigerating units, boilers
• Building structures and installations such as steel-reinforced concrete ceilings
and walls, stairways, long corridors, rising mains, cable ducts
• Room furnishings such as metal shelves, file cabinets
dB
t
Signal can no longer be detected
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