Enterasys Networks 9033348-02 - Manual (Page 14)

Determining the Antenna Locations
1-2 Site Preparation
Determining the Antenna Locations
The locations where the antennas can be placed relative to one another and the distance
between them are based on the following factors:
•
Type of antennas. The RoamAbout antennas are described in the “Antenna Options”
section on page 1-9 .
•
Length of cable from the antenna to the Access Point.
•
Data rate required.
•
Obstructions in the signal path.
•
Type of RoamAbout PC Card.
•
In a LAN-to-LAN network, the distance between the buildings.
•
In a wireless infrastructure network, the area around the antenna where clients need to
communicate with the Access Point.
Typically, the RoamAbout directional and omni-directional antennas are installed on
rooftops. The directional antenna can also be installed to the side of a building. The
vehicle-mount antenna is mounted to a vehicle and connected to the client with a 2.5 meter
(8 foot) cable. The following sections describe the factors that affect the range of the
antennas.
Maximum Distances Between Antennas
The following tables list the maximum distance between antennas at a given data rate. The
distance in tables are based on the following:
•
15 meter (50 foot) low-loss antenna cable from the antenna to the Access Point.
•
Type of PC Card (standard or Hi-Gain matched). See the “RoamAbout PC Card
Variations” section on page 1-4 .
•
No obstructions in the line of sight. See Table 1-1 and Table 1-2 . The Line of Sight
Clearance column indicates the radius of the radio beam. Obstructions in the line of
sight reduces the total distance, as described in the
“Line of Sight” section on page
1-4 .