Toshiba Strata AirLink, Руководство по установке

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Pre-installation
Step 2: Review System Component Placement
Strata AirLink Installation Guide 5/00
7
Table 2 shows attenuation obstruction caused by common materials in a building.
➤
To reduce or eliminate attenuation and fading
1. Begin the signal path without obstructions even
though signals can travel through obstacles (see
Figure 4 ).
2. If obstructions cannot be avoided, do not place
the Base Stations:
♦ On or near metallic objects or on walls that
have metallic content such as metal girders
or foil-backed insulation.
♦ Near large obstructions; for example, doors
that could temporarily obstruct antennas
when the doors open.
3. Place components in locations that ensure clear
line of sight signaling between the Base Station
and handset.
Note
In general, for optimum coverage and reduced signal fading, it is recommended that the
coverage by the Base Station overlap by approximately 25 percent. Base Stations are
designed to automatically use frequencies that are not already in use, so interference
between the Base Stations is not a problem.
4. Plan coverage for each floor separately in multi-story environments. A single Base Station can
support multiple floors. The guidelines for ensuring proper broadcast ranges and maximum
traffic must be followed.
5. Consider the high traffic areas and install the number of Base Stations required to meet the
estimated traffic demand. When multiple Base Stations are needed in the same location, you
can mount Base Stations as close as one meter apart.
Table 2 Signal Attenuation Obstruction
Object
Approximate
dB Loss
Concrete 20
Concrete with metal siding 30
Brick 15
Plaster 10
Walls with windows 10
Walls with metal coating 20
Venetian blinds
Open
Closed
10
20
Soft partitioning 3 to 4
2975
Base Station Corridor
Corridor
Figure 4 Maximum Line of Sight