User guide

TD 92422GB
18 February 2010 / Ver. E
System Planning
Ascom IP-DECT System
23
9 Location of the Base Stations
Once the surroundings are analysed, an exact position for each base station must be
decided. The most important thing when deciding the location is to ensure sufficient
coverage and traffic capacity.
Other things to consider are:
• LAN access, see 9.1 LAN Access.
• Power the base stations, see 9.2 Power the Base Stations.
• Antennas, see 9.3 Antennas.
9.1 LAN Access
Access to the LAN must be considered when placing the IPBSs, it should be placed as close
as possible to existing LAN ports.
The cable length limitation of the ethernet 802.3 10/100base-T is 100 metres.
9.2 Power the Base Stations
Another aspect of base station planning is powering of the base stations. The various ways
of powering and the requirements on the power supply are described in the Installation
and Operation Manual for IP-DECT Base Station (software version 4.0.x), TD
92682GB.
9.3 Antennas
This section describes the behaviour of the different types of antennas.
9.3.1 Internal and External Antennas
In an environment with much reflections (such as most office environments) there will not
be much difference in coverage of the internal and external antennas. Some areas that are
covered by the internal antennas will not be covered by the external and vice versa.In an
environment with low reflections the somewhat directional behaviour (forward bias) of
the internal antennas will be noticeable, see
figure 12. It may be worth trying to place
base stations horizontally in order to get more vertical coverage in for example stair wells.
Figure 12. Antenna pattern of the Internal and External Antennas
Front
Rear
010 Base Station Seen from Above
Base Station
Coverage Area Internal Antennas
Coverage Area External Antennas