Intel Wireless Adapters: How to Configure 802.11n Channel Bonding for Network and I/O

Documentation

Install & Setup

000005799

12/21/2015

Channel bonding creates more room for data by bonding or combining together two 20 MHz channels into a 40 MHz channel. Channel bonding increases the data rate because data rate is directly proportional to channel bandwidth. 802.11a/b/g networks use a single 20 MHz channel. 802.11n networks can use a 40 MHz channel.

IEEE 802.11n channel bonding is configured under the Microsoft Windows Network Adapter* Properties Advanced tab. It is referred to as 802.11n Channel Width. A Microsoft Windows 7* example can be seen below. Microsoft Windows XP* has a similar interface.

Channel Bonding

There is a separate configuration parameter for each frequency band that the wireless device supports (not all Intel wireless devices support 5.2 GHz). Two configuration values are available for Channel Width, 20 MHz Only and Auto. Choosing a 20 MHz channel width effectively disables channel bonding. Choosing Auto will allow the Access Point (AP) to determine the channel width. If the AP supports channel bonding, then the channel width will be 40 MHz. If the AP does not, the channel width will be 20 MHz.

Notes Although configurable on most wireless devices, Intel does not recommend using 40 MHz channel width in the 2.4 GHz frequency band because of the limited number of non-overlapping channels.
The 2.4 GHz channel width cannot be configured on the Intel® Wireless WiFi Link 4965AGN adapter because it does not support channel bonding in that frequency band.
Related topics
What are the supported Wi-Fi channels for IEEE* 802.11n 40MHz?
What is Multiple-Input/Multiple-Output (MIMO)?