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• Fire resistant doors.
• A wall of steel cabinets, large computer equipment or machinery.
• Thick concrete floors.
During the site survey, be aware of the following:
• Choose a corridor or other large open space, rather than an enclosed area, so that the
radio signal passes through as few walls as possible to reach as large an area as
possible.
• Radio reception inside a vehicle is poor unless the user is close to the DAP.
• Ensure that the DAP is placed high enough to be unaffected by surrounding objects. For
example, a DAP in a car park needs to be placed higher than a vehicle that is parked next
to it.
• Ensure that DAPs are separated by at least 1 meter.
• The presence of another unsynchronised DECT System, or any similar system in adjacent
buildings, causes interference.
• A DAP or a DECT Handset interferes with sensitive laboratory equipment and medical
equipment (for example, ensure that DAPs are installed outside of an operating room at
an hospital.)
• Ensure that significant interference from unsuppressed engines or electric motors is
accounted for.
Traffic density calculations
Perform the traffic density calculations so that you have a low blocking probability in the
system.
For traffic calculations, you must know
• the number of users
• the type of users
The following table lists the three user types.
Table 3: Three user types
Traffic
Average
High
SIP DECT Fundamentals
Low
Executive and secretary groups
help desks, Tele-services
Application
normal offices
Site planning
Erlang/User
0.05
0.1-0.15
0.2-0.25
October 2012
39
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