AVM FRITZ!WLAN Repeater N/G Spécifications télécharger pdf (Page 33)

Frequency Ranges

2.3 Frequency Ranges

WLAN uses the frequency range around 2.4 GHz in the ISM

band or, alternatively, the frequency range at 5 GHz.

2.4-GHz Frequency

Band

In the 2.4-GHz frequency band WLAN works in the same

range as Bluetooth, microwave devices and various other

devices like some cordless telephones, radio-controlled

toys, garage-door openers and video bridges. This means

that interference may occur within WLANs operated in the

vicinity of such devices. Generally the only adverse effects

are to the transmission rate; aborted connections and da-

ta losses are rare.

WLAN in the 5-GHz frequency band is subject to less inter-

ference, as these radio frequencies are used much less of-

ten.

In the 2.4-GHz frequency range the European regulation

authorities have designated 13 channels for WLAN.

A channel can have a bandwidth of 20 MHz (throughput

up to 130 Mbit/s) or 40 MHz (throughput of up to

300 Mbit/s).

Channels located directly next to each other in the 2.4-

GHz band may overlap and result in mutual interference.

For instance, if several WLANs are operated close to each

other in the 2.4-GHz frequency range with a bandwidth of

20 MHz, a distance of at least five channels should be left

empty between each two channels used. This means that

if channel 1 is selected for one WLAN, the channels 6

through 13 can be selected for a second WLAN. This main-

tains the minimum distance between channels.

If your WLAN access point is equipped with an autochan-

nel function, you can automatically have it search for a

WLAN channel in your frequency range that is subject to as

little interference as possible.

In order to communicate with each other, the

FRITZ!WLAN Repeater and the WLAN access point must

work in the same frequency band.

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AVM FRITZ!WLAN Repeater N/G Spécifications Page 33