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System and RF Planning射频系统无线规划
作者:深圳安视源    发布于:2013-01-04 11:06:17    文字:【】【】【
 To allow optimal configuration, you must properly plan your network, especially configuration layout and RF (radio frequency). Planning is especially required if you want to install many systems in the same area, in order to prevent radio interference between the colocated devices and to select the appropriate antennas. In all cases, follow the recognized RF installation practices.
Available Frequency Bands and Channels
Communications in the following frequency bands, in North America and Europe:
2.4 GHz OFDM, also known as 802.11g
5 GHz OFDM, also known as 802.11a
2.4 GHz Band
The 2.4 GHz band provides 11 channels in North America and 13 in Europe. In these two regions, only channels 1, 6, and 11 are non-overlapping. All these channels are for indoor or outdoor use. The center frequencies of the channels are:
Channel Frequency (GHz)
1 2.412
2 2.417
3 2.422
4 2.427
5 2.432
6 2.437
7 2.442
8 2.447
9 2.452
10 2.457
11 2.462
12 2.467 (Europe only)
13 2.472 (Europe only)

5 GHz Band
In the 5 GHz band, the number of available channels and sub-bands vary depending on the country of operation. Most European countries adhere to the DFS (Dynamic Frequency Selection) and TPC (Transmit Power Control) regulations established by the European Telecommunications Standards Institute (ETSI); these regulations apply to the 5 GHz frequency band only.
In North America, nine channels are available in the 5 GHz band, all non-overlapping and for indoor or outdoor use. The center frequencies of these channels are:
Channel Frequency (GHz)
52 5.26
56 5.28
60 5.30
64 5.32
149 5.745
153 5.765
157 5.785
161 5.805
165 5.825

In Europe, the 11 non-overlapping channels, for indoor or outdoor use, are:
Channel Frequency (GHz)
100 5.50
104 5.52
108 5.54
112 5.56
116 5.58
120 5.60
124 5.62
128 5.64
132 5.66
136 5.68
140 5.70

Wireless Cells
A wireless network is designed such that information can travel back and forth between two points without the need for wires. Wireless devices are grouped into wireless cells.
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