Gigaset N870 IP Pro Site Planning And Measurement Manual page 50

DECT installations in special environments
Several buildings
Planning a DECT installation for several buildings or for separate parts of buildings requires
clarification of the following:
•
Should calls only be possible within the internal rooms or across the whole site, even in the
outside area?
•
In which area should handover be guaranteed?
The cheapest way to connect separate parts of buildings with the DECT system is to use separate
clusters (subnet). In this case, only the wiring of the different buildings or building parts via the
LAN must be ensured. All phones registered with the DECT system can be used everywhere;
handover is not always possible however.
Outside area
The outside area of a building can often be included in the DECT network through a base station
close to a window. The prerequisite for this is that the glass in the window must not contain any
metal (metal film, wire mesh).
If the outside area cannot be covered by base stations within the building, a base station can also
be installed in the outside area. The base station should then be mounted in a suitable external
housing to protect it against weather conditions (available from third-party manufacturers).
The thresholds for the operating temperature of the base stations (+5° to + 40°) must be taken
into consideration.
The installation can be on a mast (not metal), on the roof or on a wall of the building. Please note
that the LAN connection must be guaranteed, as this supplies the device with power and is also
required for the connection to the DECT Manager.
The range on the site is up to 300 m, but might be restricted by other buildings, walls or trees.
A base station mounted in the outside area can also cover further indoor parts of buildings
if the walls of these areas do not reduce the radio signal too strongly.
For measurements outside, please note that weather conditions, e.g., rain or snow, can significantly
influence the send and receive properties. If necessary, perform further measurements in different
weather conditions; plan the radio coverage generously if you want to guarantee secured
reception. Changes in the vegetation (leaves on the trees, growth of bushes) can also affect
the radio conditions.
Handover over the whole site
If handover is to be achieved over the whole site, including all buildings, the transition areas
between internal rooms and the outside area must be planned and measured carefully.
Example: The building can only be accessed through a metal door with 100% absorption. In this
case, when the door is open the handover between the nearest base station indoors and the
base station for the outside area must be guaranteed. Both base stations must be synchronised
and (with the door open) have the required overlap area.
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