The 2.4GHz 802.11n standard supports 40MHz channel bandwidth which will use two channels to increase wireless throughput.

On DrayTek wireless routers, the main 2.4GHz wireless channel is selected in [Wireless LAN(2.4GHz)] > [General Setup].

The extension channel will depend on the main channel selected, and is always four channels apart from the main one. The extension channels used in Vigor Wireless Router are listed below:

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