Product manual

Configuration directions, Base station planning - additional information
Technical Product Manual - DCT1800-GAP
TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C
© 2006
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with surprises. A well-positioned base station on the top floor (20 to 30 metres at most from the room
where coverage is required) usually provides sufficient coverage for the maintenance rooms on the
roof, but it is better to be safe than sorry so check by means of measurements.
Basement/indoor car park
There is little to say here because this varies depending on the situation but it is mentioned for the
sake of completeness. Treat them in the same way as special areas and see 1.2.2 Walls and 1.2.3
Ceilings and floors.
4.2.2 Walls
Walls, ceilings and floors are in general, and with the exception of the client’s requirements, the most
important factors in the entire site survey process. For this reason it is important for the site survey
engineer to have some experience of these. A distinction must be drawn between a large number of
different types of wall. A list of the commonest types and the approximate range achieved with these
specific materials is given in table
2. Please bear in mind that when a concrete wall is mentioned, it
encompasses very many different possibilities. The most common can be summarised as follows:
Note that these are only estimated values. Furniture (cupboards etc.), and the amount of movement
in the area to be covered, e.g. cranes in a production hall (see also 1.2.7 Metal halls) are further factors.
4.2.3 Ceilings and floors
In principle the same applies here as to the walls. The difference lies in the fact that different materials
are used. Concrete and reinforced concrete are the main materials used. It is very important when
dealing with floors and ceilings to determine the level of coverage of a base station on the floor above
and below. This is because in general you are able to make good use of this. If, for example, you are
dealing with a ‘normal’ concrete ceiling, there will also be partial coverage for the storey above (and
below). For ‘normal’ concrete this coverage extends to a radius of approx. 15-20 metres. Bear in mind
that here too common sense has a part to play: an open stairwell or an atrium can sometimes be used
to provide coverage to a whole area on two floors at the same time (see figure
6).
Type Feature Range in meters
Stud wall Plaster 30-60
Concrete 10-30
Reinforced con-
crete
Fire wall, for example 0-10
Stone/brick 30-50
Metal May be a panel on brickwork 0-10
Wood 30-60
Wired glass For fire protection 0-10
Surface coated
float glass
Only of importance for coverage outside if the
base station is installed inside
40-80
None Open-plan office or outdoors 150-300
Table 2 Typical cell sizes