By IEEE definition of the 802.11n Standard, for the 2.4 GHz band there are only 3 non overlapping channels allowed for the North American Region, the channels are:
- 1 (2402 MHz to 2422 MHz)
- 6 (2427 MHz to 2447 MHz)
- 11 (2452 MHz to 2472 MHz)
For 802.11n speeds to work on the 2.4GHz band there should be a 40 MHz “wide” channel centered on channel 6, which means that frequencies from 2417 MHz to 2457 MHz are used simultaneously, this is almost the entirely usable spectrum for 2.4 GHz.
This does not mean that older Wireless devices cannot operate in the presence of a new Wireless-N router.
To avoid interference and assure interoperability on the 2.4 GHz band with devices using 802.11b or 802.11g, the Standard defines that the router set on 802.11n must use “coexistence” algorithms to prevent the older wireless devices from being disconnected from their source (Router, Access point, peer-to peer connection, etc). These algorithms will force the 802.11n devices to “slow down” to 20 MHz channels momentarily, allowing the older devices to transmit and receive information.
Due to the existence of a large amount of wireless devices currently working on the 2.4 GHz band, which ranges from wireless cards to cordless phones, is highly probable that your router might encounter interference from neighboring wireless devices, therefore the speed of your connection might be affected.
Intel, as part of the WIFI Alliance is bound to be certified and compliant with the IEEE standard. The speeds obtained by our adapters are in accordance with the 802.11n Standard in regards of what is to be expected under normal conditions of Interference under the 2.4 GHz band.
This applies to: