Aastra 400 Series - Location Areas; DECT in an Aastra Intelligent Net (AIN)

Planning
40
Planning Aastra 400 DECT systems as of R1.0
syd-0457/1.0 – R1.0 – 10.2012
5. 3. 2. 3 Location areas
Up to 4 location areas can be configured in an Aastra 400 DECT system. With in-
coming calls each cordless phones is called by the system simultaneously via all the
radio units of a location area in which the cordless phones is logged on. As the ca-
pacity of the signalling channel is limited, splitting the radio units into several loca-
tion areas needs to be considered in the following cases:
• As of approx. 80 cordless phones and a large volume of incoming calls
• If more than 9 incoming calls are to be signalled on the cordless phones within
one second
Distributing the radio units over several location areas ensures that the radio traffic
involved in locating cordless phones for incoming calls is distributed across the lo-
cation areas. This means that overall more calls can be processed simultaneously.
If a cordless phone switches from the coverage range of one location to that of an-
other, cordless phones will automatically log into the new area from scratch. To
prevent cordless phones from constantly logging themselves on in location areas,
make sure you observe the following points:
• The radio units of any given location area should cover a contiguous area (see
example on page 22).
• Cordless phones should be used mainly within the same location area.
• Cordless phones should not be continually used in the overlap zone between
two location areas.
5. 3. 2. 4 DECT in an Aastra Intelligent Net (AIN)
Radio units on a node
If possible, it is basically advisable to connect all radio units in an AIN on the master,
if this latter also has access to the public network. This saves some VoIP resources
for the internal and external voice traffic and allows a handover within the entire
coverage range.
It may also be sensible, with big DECT systems, to use a satellite as DECT server. To
avoid unnecessarily overloading the connection between the master server and
the satellite, the satellite should have its own network interfaces.