AASTRA RFP 34 IP DECT Site Survey Kit User Guide DE - Handbuch (Seite 44)

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Measurement/Planning
The planning procedure is described below.
1. Ascertain customer requirements.
2. Roughly determine the locations for the base stations.
3. Measure out the DECT system in situ.
4. Install and re-measure the system.
Ascertaining customer requirements
Since the aim of DECT systems is to cover all kinds of different mobility requirements in a non-stan-
dardized environment, we need to determine and record precisely what sort of requirements the
customer has in mind. Records avoid misunderstandings and can be used as a working paper (e.g.
project progress report) or as specifications to be confirmed by the customer.
Important questions:
• Situation: Where are the calls to be made from – outdoors/indoors?
• Premises: What surface area and what height or depth (storeys, basement floors) form part of the
supply range? Recommendation: Request building plan or make a sketch.
• Building structure: What sort of materials and types of construction are the buildings made of?
What sort of structural changes are planned for the near future?
• Subscribers: How many handsets are required? What sort of phoning pattern do users have?
• Traffic density: How are the handsets distributed throughout the premises and which users are
where? (Specify areas with a high traffic density.)
• Dynamics: How many handsets are expected where and at what times of the day? Recommenda-
tion: Take account of special infrastructure areas such as cafeteria 9:00…10:00, meeting rooms,
open-plan office.
Initial Rough Determination of the Base Stations Locations
Radio circumstances are difficult to estimate. For this reason, situations regarded as particularly criti-
cal need to be determined on site through measurements.
This will provide a reliable idea of the equipment required and the locations for the base stations.
The following rules of thumb may be of help:
• Good connections still possible in a horizontal direction behind 2 or 3 ordinary brick walls; barely
any penetration through concrete floors and ceilings in a vertical direction and in ground floor or
basement floors, i.e. each storey must be supplied separately. A certain amount of vertical pene-
tration can be expected from the first floor upwards; generally speaking, radio propagation condi-
tions improve as the distance from the ground increases.