Table of Contents
Advertisement
Part 1: Site Survey and Overview of DECT Systems
Environmental Considerations for Users and Buildings
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.
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.
Do not install a Base Station where it could spoil architectural features.
Consider ease of maintenance when installing a Base Station.
Other Considerations
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.
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.
Glass
Glass, metal reinforced grid
Glass, metal-clad sun guard
Wall, indoor, wood
Wall, brick, 10cm
Wall, concrete, 15cm
Wall, concrete, 20cm, large windows
Wall, concrete, 40cm
Concrete
Concrete, metal clad
Concrete, window
Venetian blinds open
Venetian blinds closed
Soft partitioning
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.
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.
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.
Table 1: Radio Interference by Materials
Material
Approximate Loss in dB
2
10
10
2
3.5
9
6
17
15
30
8–9
10
20
3–4
3
Advertisement
Table of Contents
