Quatech 802.11B/G Especificaciones descargar pdf (Pagina 51)

100-8004-102G Airborne Wireless LAN Node Module Data Book

Page 45

Quatech, Inc. Confidential

IEEE 802.11 wireless nodes, like your Airborne WLN Module, use radio-frequency signals in the

Industrial, Scientific, and Medical (ISM) band between 2.4 GHz and 2.5 GHz to communicate

with each other.

Due to the spread-spectrum effect of the signals, a node sending signals on a particular channel

uses the frequency spectrum 12.5 MHz above and below the center channel frequency. As a

result, two separate WLANs in the same general vicinity that use neighboring channels (channel

1 and channel 2, for instance) can interfere with each other. Applying two channels that allow

the maximum channel separation decreases the amount of channel cross-talk and provides

performance gains over networks with minimal channel separation.

Note:

The available channels supported by wireless products in various countries

are different.

The preferred channel separation between the channels in neighboring wireless networks is

25 MHz (5 channels). Neighboring channels are 5 MHz apart. To minimize adjacent channel

interference, you can apply a maximum of three different channels within your WLAN. There are

11 usable wireless channels in the United States. It is recommended that you start using

channel 1 and grow to use channel 6, and 11 when necessary, as these three channels do not

overlap. The following chart lists the 802.11 radio-frequency channels that are used.

Table 18. 802.11b/g Channel Frequencies

Channel Center Frequency Frequency Spread

1 2412 MHz 2399.5 MHz - 2424.5 MHz

2 2417 MHz 2404.5 MHz - 2429.5 MHz

3 2422 MHz 2409.5 MHz - 2434.5 MHz

4 2427 MHz 2414.5 MHz - 2439.5 MHz

5 2432 MHz 2419.5 MHz - 2444.5 MHz

6 2437 MHz 2424.5 MHz - 2449.5 MHz

7 2442 MHz 2429.5 MHz - 2454.5 MHz

8 2447 MHz 2434.5 MHz - 2459.5 MHz

9 2452 MHz 2439.5 MHz - 2464.5 MHz

10 2457 MHz 2444.5 MHz - 2469.5 MHz

11 2462 MHz 2449.5 MHz - 2474.5 MHz

12 2467 MHz 2454.5 MHz - 2479.5 MHz

13 2472 MHz 2459.5 MHz - 2484.5 MHz

14 2484 MHz 2471.5 MHz – 2496.5 MHz

APPENDIX B

RADIO FREQUENCY CHANNELS

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 66 67

Sin comentarios

Quatech 802.11B/G Especificaciones Pagina 51