Specifications

Frequency Ranges

baby monitors, microwave ovens). Should problems with in-

terference persist despite this function, try to identify the

source of interference and switch it off manually.

Additional tips on interference in the WLAN radio network are

presented in the section Ruling Out Interference Caused by

Other Wireless Networks from page 92.

5-GHz Frequency Band

The FRITZ!Box can operate in the 5-GHz frequency band as an

alternative. This frequency range is used much less often

than the most common 2.4-GHz frequency range.

In the 5-GHz frequency band the FRITZ!Box supports automat-

ic channel switching by DFS (Dynamic Frequency Selection).

DFS ensures that the channels from 52 to 140 are kept free

for higher-priority users, like weather radar systems. If you

are operating your FRITZ!Box in one of these channels, it mon-

itors the selected channel periodically for higher-priority us-

ers, and, if necessary, switches to a different channel. Note

that the FRITZ!Box waits up to ten minutes, as legally re-

quired, before occupying a free channel. During this period

you cannot register any WLAN devices. The WLAN connection

is then established automatically. For more information, see

the section Avoiding WLAN Channels with DFS on page 91.

A prerequisite for use of the 5-GHz frequency band is that all

WLAN devices in the network support this frequency range in

accordance with the IEEE 802.11a or IEEE 8002.11n stan-

dard.

2.4GHz or 5GHz

The FRITZ!Box works in the wireless network either in the 2.4-

GHz range or in the 5-GHz range, but not parallel in both fre-

quency ranges at the same time.

Bandwidth

In both frequency ranges you can select between channel

bandwidths of 20 MHz or 40 MHz (exception: channel 140 in

the 5-GHz frequency band). The FRITZ!Box initially attempts

to select a channel with 40 MHz bandwidth (throughput up to

300 Mbit/s). If this is not possible due to interference or

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