Coverage area
21
Planning Aastra 400 DECT systems as of R1.0
syd-0457/1.0 – R1.0 – 10.2012
3. 1 Topology 
A radio system supplies a specific area. This area is known as the supply range. In 
practice, different independent DECT systems may exist.  A cordless phone can be 
logged on in up to four autonomous DECT systems. The supply ranges for these in-
dependent DECT radio systems can also overlap.
Fig. 3 Radio system
Coverage range of one single radio unit
Supply range = 1 radio system
Radio unit