Alvarion BREEZENET BU-DS.11 Manuale Utente

 

2-6 

Path Loss 

Path loss is determined mainly by several factors: 
♦  Distance Between Sites: Path loss is lower and system performance is better 

when distances between sites are shorter. 

♦  Clearance: Path loss is minimized when there is a clear line of sight. The 

number, location, size, and makeup of obstacles determine their contribution 
to path loss. 

♦  Antenna Height: Path loss is lower when antennas are positioned higher. 

Antenna height is the distance from the imaginary line connecting the 
antennas at the two sites to ground level. Ground level in an open area is the 
actual ground. In dense urban areas, ground level is the average height of the 
buildings between the antenna sites.  

Rooftop Installation 

Rooftop installations offer several advantages: 
♦  Fewer obstacles in the path. 
♦  Improved performance due to greater height. 

Antennas for Outdoor Applications 

The 

BreezeNET DS.11 series can be used in point-to-point or point-to-multipoint 

configurations.  

Point-to-Point 

The BU-DS.11/RB-DS.11 can be equipped with a directional antenna. The 
required antenna gain depends on the required range and performance. 

Point-to-Multipoint 

Setting up a point-to-multipoint link requires the use of a Base Unit equipped with 
an omni-directional antenna (or an antenna with sufficient bandwidth to 
illuminate all units) and at least two remote units equipped with high-gain 
directional antennas. 

Antenna Polarization 

Antenna polarization must be the same at both ends of the link. In most 
applications, the preferred orientation is vertical polarization, which is better for 
above ground propagation. To verify antenna polarization, refer to the assembly 
instructions supplied with the antenna set.