The latest 802.11ac is only defined for 5GHz but all devices still support 802.11n and … Here’s an image to give you an idea. IP traffic predictions from the Cisco annual Mobile Visual Networking Index.

The four bands in the 5GHz spectrum are: U-NII-1 (lower) comprises four 20 MHz … There are UNII bands 1,2,3 and 2e. Wi-Fi networking provides us with 2 bands for the operation of wireless LAN networks: the 2.4Ghz band and the 5GHz band.

This would be U-NII-2B, 5.350 – 5.470 GHz and U-NII-4, 5.850 – 5.925 GHz .

In the next few chapters, I hope to provide an overview of the current and proposed DFS require-ments for Europe and the proposed DFS requirements for the US. the 5GHz bands for unlicensed, and possibly licensed devices. The 2.4 band is allocated for microwave heating. There are a total of 23 U-NII channels available for use. This range is also referred to as UNII-2A. 802.11h adds a further 11 channels plus the use of UNII-3. 802.11a uses Orthogonal Frequency Division Multiplexing (OFDM) and there are 12 channels in the 5GHz bands. It has lowered the barrier of entry for new-comers and enabled low-cost deployments that have made Wi-Fi a ubiquitous local network connectivity technology.

Creating 40 MHz, and larger channels involve bonding multiple neighboring channels together.

The 2.4-GHz and 5-GHz frequency bands support a limited number of non-overlapping 20-MHz and 40-MHz channels. The lowest 8 channels currently used lie in the 100MHz bands UNII-1 and UNII-2. UNII-3 (Upper) band ranges from 5.725-5.825 GHz and has 4 channels. 5 GHz U-NII Bands – Antenna Gain and Emissions Rules Talking Points June 13, 2014 Mimosa filed a Petition for Partial Reconsideration of the 5 GHz U-NII technical rules adopted March 31, 2014. Key Points Each of them has varying usage (indoor/outdoor) and power restrictions. Depending on which book you read (and when it was written) around 23 channels are available in the USA in the 5GHz … Additionally, manufacturers must ensure that parameters including output power, restricted channels and DFS functionality, in the 5 GHz U-NII bands cannot be changed by third parties. All the channels are non-overlapping. In order to use this range, your device needs to be equipped with Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC). The ISM bands are allocated for industrial, scientific, and medical wireless services. 5GHz was introduced in 802.11a, but the radios were expensive and the band didn’t gain popularity. However, in the US, one can use channels from both of the UNII: 2 and UNII: 3 sub-bands… Both UNII-2 and UNII-3 can be used indoors or outdoors.

4 bands within 5 GHz . The UNII-2C/UNII-2 Extended range is found between 5,470MHz and 5,725MHz. This range includes channels from 100 to 140. With 5GHz however your legal limits are defined by which frequency you are operating within and which frequency you need to operate within is defined by your link requirements. As of this writing, there are 4 Unlicensed National Information Infrastructure bands (U-NII). Table 1: 20 MHz channels on the 5 GHz band. At 5GHz there are four “Bands” available, each containing a bunch of WiFi channels. This is then broken down into 3 different bands (Band A, B and C). 802.11n was defined for both 2.4GHz and 5GHz bands, which finally launched 5GHz use. The availability of unlicensed spectrum in the 2.4-GHz and 5-GHz bands has driven Wi-Fi growth. The first band, UNII-1, is designed mainly for domestic use because from Unii-2 upwards, your router needs to have DFS (dynamic frequency selection) and TPC (transmit power control) built in, which will automatically adjust the channel and power output of your router so it doesn’t interfere with military, radar, weather station signals and so on. Now, just above and below these bands are licensed bands where you have things such as the 4.9 GHz Public Safety band and 6.0 GHz licensed band. As explained in Section 3, this radio is based on a set of 5 GHz GaAs building blocks. Each bonded channel has a primary 20 MHz channel that is used when an 802.11n or 802.11ac access point communicates with a legacy 802.11a client or an 802.11n or 802.11ac client that is artificially limited to smaller channels. Channel Width of each channel is 20Mhz. (The “ISM band is reserved for industrial, scientific and medical use.) The 2.4GHz band has a reputation of being something of a “sewer” of a band, due to its limited number of usable channels, the number of Wi-Fi devices already using the band, and the high levels of non-Wi-Fi interference that it experiences. This is to restrict the module to operate outside the parameters it was certified with. The bands are allocated fro specific wireless services. For the most part, you can do what you want in the 5 GHz band though. Note: the FCC is currently considering whether to add two more U-NII bands in the 5 GHz band. texts talk about how the 5GHz band is divided up in to a number of UNII bands. (Range: 100MHz) Total of 23 channels are present in the 5GHz range and all the channels are non-overlapping and we get a range of 550MHz to transmit data. But it has also contributed to its woes, as unlicensed spectrum …