ALink-5801a
Wireless LAN Outdoor Bridge
ALCON Telecommunications Co., Ltd.
41
6.2 Data Rate
According to the following table, you will have the idea about over what range the
ALink-5801a with what kind of antenna could operate under what data rate. You
might also know the relationship between the data rate and the maximum radio range;
for example, the bridge with 12dBi antenna could operate well under 6 Mbps data rate
within 17 KM.
Data Rate
Maximum Distance
(12dBi Antenna)
Maximum Distance
(23dBi Antenna)
6 Mbps
17.72 KM
30.79KM
9 Mbps
16.82KM
29.36 KM
12 Mbps
16.07KM
28.07 KM
18 Mbps
14.64KM
25.60 KM
24 Mbps
11.66 KM
20.26 KM
36 Mbps
8.21 KM
16.85 KM
48 Mbps
3.72KM
12.23 KM
54 Mbps
1.84 KM
7.32 KM
Table 1 Evaluated Maximum Distance
6.3 Planning Radio Path
For the wireless communication, the Line-of-Sight (LOS) will be the major issue
over
building up the wireless link. This evaluated procedure is to reduce the
obstructions and to avoid the multiple-path signal degrading the communication
quality.
The first requirement is the Line-of-Sight (LOS) between the both sides
’
Antennas. The radio line-of-sight concept is the area along the radio linking path
through which is the bulk of the radio signal power travels. The area is known as
the first Fresnel Zone of the radio link. For the radio link, it should avoid to be
affected by obstacles in this path, including the ground within 60% of the first
Fresnel Zone.
The following figure illustrates the concept of a good radio line-of-sight.
