Radio Path Planning - Hirschmann BAT54 Installation Manual

3
Bridge Link Planning
Data Rate 17 dBi
Integrated
48 Mbps 2.9 km
54 Mbps 1.8 km
Distances provided in this table are an estimate for a typical deployment and may be reduced by local
regulatory limits. For accurate distances, you need to calculate the power link budget for your specific
environment.
.
Data Rate 17 dBi
Integrated
12 Mbps 13.4 km
18 Mbps 12.8 km
24 Mbps 12.2 km
36 Mbps 11.1 km
48 Mbps 8.2 km
72 Mbps 4.6 km
96 Mbps 2.1 km
108 Mbps 1.3 km
Distances provided in this table are an estimate for a typical deployment and may be reduced by local
regulatory limits. For accurate distances, you need to calculate the power link budget for your specific
environment.

Radio Path Planning

Although the wireless bridge uses IEEE 802.11a radio technology, which is capable
of reducing the effect of multipath signals due to obstructions, the wireless bridge
link requires a "radio line-of-sight" between the two antennas for optimum
performance.
The concept of radio line-of-sight involves the area along a radio link path through
which the bulk of the radio signal power travels. This area is known as the first
Fresnel Zone of the radio link. For a radio link not to be affected by obstacles along
its path, no object, including the ground, must intrude within 60% of the first Fresnel
Zone.
3-2
Distances Achieved Using Normal Mode
8 dBi Omni 13.5 dBi
120-Degree
Sector
0.4 km 1.2 km
0.2 km 0.7 km
Distances Achieved Using Turbo Mode
8 dBi Omni 13.5 dBi
120-Degree
Sector
2.3 km 7.3 km
2.1 km 6.5 km
1.8 km 5.8 km
1.5 km 4.6 km
1 km 3.3 km
0.6 km 1.8 km
0.3 km 0.8 km
0.2 km 0.5 km
16.5 dBi 23 dBi Panel
60-Degree
Sector
2.3 km 9.2 km
1.5 km 5.8 km
16.5 dBi 23 dBi Panel
60-Degree
Sector
12.2 km 21.2 km
11.7 km 20.3 km
11.1 km 19.4 km
9.2 km 17.7 km
6.5 km 15.4 km
3.7 km 12.2 km
1.6 km 6.5 km
1 km 4.1 km