CTP Systems CTPhone 1900, Applications Manual

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DOC00101-01 2-9
CTPhone 1900 System Planning
Determining Base Station Placement
Once you have completed the steps described in Site Survey on page 2-6
and determined the number of base stations you need, you should deter-
mine where to install the base stations for optimum coverage and opera-
tion of the CTPhone 1900 system. This section provides guidelines and
examples you can use to determine base station placement in your site.
General Guidelines
1 In open, symmetrical areas, mount base stations in a centralized loca-
tion on the ceiling, and rotate the antennas perpendicular to the ceiling.
You can mount a base station above a dropped ceiling as long as the
dropped ceiling is not metallic.
2 In corridors or non-symmetrical areas, mount base stations on walls
and facing towards the area you want to provide the greatest cover-
age. You should mount them mid-way between the floor and perma-
nent ceiling, but above any obstructions such as cubicle walls.
Antennas on wall-mounted base stations must be rotated parallel to
the wall.
3 Place base stations to maximize direct line of sight between handsets
and base station antennas. Signals should begin their path with a clear
line of sight to reduce the affect of signal fading.
4 Do not place base stations on or near metallic objects or on walls that
have metallic content such as metal girders or foil-backed insulation.
5 Do not place base stations near large obstructions. For example, do
not mount them near doors that could temporarily obstruct antennas
when the doors open.
6 Overlap coverage of base stations by approximately 25%.
7 To minimize blocking in high traffic areas, install the number of base
stations required to meet the estimated traffic demand (see Traffic
Guidelines on page 2-7.) When multiple base stations are needed in
the same location, you may mount base stations as close as one meter
apart.
The base stations are designed to automatically use frequencies that
are not already in use, so there is no problem of interference between
base stations that are mounted near each other.
8 In multi-story environments, plan coverage for each floor separately.
However, because RF signals can travel between floors, a single base
station could support multiple floors as long as base station broadcast
area, traffic requirements, and other general guidelines are followed.