Samsung DECT 500, Installation And Programming Manual

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Part 1: Site Survey and Overview of DECT Systems
3
Environmental Considerations for Users and Buildings
y
Carefully track the movement of users to establish movement patterns. The number of
Base Stations required is determined by the number of users and their movements.
y
The distance between Base Stations should be at least 3m to avoid interference. Keep the
distance between Base Stations shorter the more frequently users move while in conversa-
tion.
y
Do not install a Base Station where it could spoil architectural features.
y
Consider ease of maintenance when installing a Base Station.
Other Considerations
y
There should be at least one Base Station with an RSSI (Receive Signal Strength Indicator)
value greater than 65 hex and a “Q” value (bit error rate) greater than 52 at some location
within the service area for DECT users.
y
Take into account radio interference caused by objects such as trees, walls and glass. Try
to install in an open environment where masking by objects is minimised. Refer to Table 1
for details.
Table 1: Radio Interference by Materials
Material Approximate Loss in dB
Glass 2
Glass, metal reinforced grid 10
Glass, metal-clad sun guard 10
Wall, indoor, wood 2
Wall, brick, 10cm 3.5
Wall, concrete, 15cm 9
Wall, concrete, 20cm, large windows 6
Wall, concrete, 40cm 17
Concrete 15
Concrete, metal clad 30
Concrete, window 8–9
Venetian blinds open 10
Venetian blinds closed 20
Soft partitioning 3–4
y
When installing cables for Base Stations, keep them away from high-speed LAN cables and
power cables which can cause electrical interference. Maintain at least 1m distance.
y
Avoid installing a Base Station near windows since radio interference between floors of a
building might be more active due to diffraction of radio waves.
y
It is recommended that a Base Station should be installed at a distance of 2m from the floor
and 30cm from the ceiling, and cables should come from the ceiling rather than the floor.