- Jul 6, 2015
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Wi-Fi Mode and Channel explanations.
Hi, today I’m going to talk about Wi-Fi frequency, mode and channel.
Wi-Fi Frequency:
Well as you may know one of the most important factor in buying a router is the router band, the band is the frequency range that the router transmits the data on that range.
Wi-Fi works on ISM frequencies (industrial scientific and medical) these frequencies are unlicensed and free of charge. The ISM frequencies are 900 Mhz for long range radio communication and low speeds – 2.4 Ghz for medium range and medium speed communications and 5 Ghz for low range and high speed communications. The reason that the range of higher frequency is less than lower ones is the wave length, as the frequency rises the wave length would be less and less, so signals would go less distance. You might heard about dual or tri-band routers well that’s right , these kind of routers has 2 or 3 radios inside them that working on 2.4 and 5 Ghz simultaneously and for the tri-band routers there are 3 radios inside the router , one of them is working on 2.4 and two others are working on 5 Ghz.
Wi-Fi Mode or Standard:
The Wi-Fi alliance created numbers of methods for data transition they call it 802.11 standards. These standards are different from each other based on the speed each of them provide.as now in the 2016 there are 5 Wi-Fi standards including A/B/G/N. the N/B/G standards are older than A standard as well as they are working on different frequencies. As mentioned before N/B/G standards are working on 2.4 GHZ frequency. While a standard is working on 5 Ghz frequency. These standards are important to understand because when you’re going to buy a router there are different routers working on different bands and standards so depending on the receiver that you have on your device you choose one of them.
So when you’re using a smartphone that is using N ( and backward compatible) radio chipset you wouldn’t benefit from an A mode radio because N chipset only gets the signal in 2.4 frequency range and would not recognize the 5 Ghz so some people mistakenly buy AC routers while they are using N mode receivers. You can find out the kind of receiver that you device using on the device specifications.
Wi-Fi Channels:
Wi-Fi frequencies has a number of channels to transmit data , for example the 2.4 ghz – 2.47 ghz band has 11 channels (14 in some countries) these channels are important to select on frequencies like 2.4 because there isn’t much of frequency range to be divided for channels.
We have two kind of channels:
1-overlapping channels:
Overlapping channels is called to the channels that could interrupt to each other and could Couse data interruption and packet loss.
2-non-overlapping channels:
Non-overlapping channels are the channels that doesn’t meet each other on a frequency range for example there are only 3 non-overlapping channels in 2.4 ghz band (1-6-11):
These factors are important to consider when designing a high density Wi-Fi network. Otherwise in home networks or small places it’s better to set the channels in one of the Non-Overlapping channels.
Co-channel Interference: this is the situation that occurs when channels interrupt to each other and a device is getting the same information on 2 channels, in this scenario the CCI occurs and cause high packet loss and interruption. This problem only happens when the two routers are working on a same channel or using non overlapping channels.
There are 25 non-overlapping channels in 5 ghz band so it’s almost impossible that a CCI (Co-channel interference) occur.
Hi, today I’m going to talk about Wi-Fi frequency, mode and channel.
Wi-Fi Frequency:
Well as you may know one of the most important factor in buying a router is the router band, the band is the frequency range that the router transmits the data on that range.
Wi-Fi works on ISM frequencies (industrial scientific and medical) these frequencies are unlicensed and free of charge. The ISM frequencies are 900 Mhz for long range radio communication and low speeds – 2.4 Ghz for medium range and medium speed communications and 5 Ghz for low range and high speed communications. The reason that the range of higher frequency is less than lower ones is the wave length, as the frequency rises the wave length would be less and less, so signals would go less distance. You might heard about dual or tri-band routers well that’s right , these kind of routers has 2 or 3 radios inside them that working on 2.4 and 5 Ghz simultaneously and for the tri-band routers there are 3 radios inside the router , one of them is working on 2.4 and two others are working on 5 Ghz.
Wi-Fi Mode or Standard:
The Wi-Fi alliance created numbers of methods for data transition they call it 802.11 standards. These standards are different from each other based on the speed each of them provide.as now in the 2016 there are 5 Wi-Fi standards including A/B/G/N. the N/B/G standards are older than A standard as well as they are working on different frequencies. As mentioned before N/B/G standards are working on 2.4 GHZ frequency. While a standard is working on 5 Ghz frequency. These standards are important to understand because when you’re going to buy a router there are different routers working on different bands and standards so depending on the receiver that you have on your device you choose one of them.
So when you’re using a smartphone that is using N ( and backward compatible) radio chipset you wouldn’t benefit from an A mode radio because N chipset only gets the signal in 2.4 frequency range and would not recognize the 5 Ghz so some people mistakenly buy AC routers while they are using N mode receivers. You can find out the kind of receiver that you device using on the device specifications.
Wi-Fi Channels:
Wi-Fi frequencies has a number of channels to transmit data , for example the 2.4 ghz – 2.47 ghz band has 11 channels (14 in some countries) these channels are important to select on frequencies like 2.4 because there isn’t much of frequency range to be divided for channels.
We have two kind of channels:
1-overlapping channels:
Overlapping channels is called to the channels that could interrupt to each other and could Couse data interruption and packet loss.
2-non-overlapping channels:
Non-overlapping channels are the channels that doesn’t meet each other on a frequency range for example there are only 3 non-overlapping channels in 2.4 ghz band (1-6-11):
These factors are important to consider when designing a high density Wi-Fi network. Otherwise in home networks or small places it’s better to set the channels in one of the Non-Overlapping channels.
Co-channel Interference: this is the situation that occurs when channels interrupt to each other and a device is getting the same information on 2 channels, in this scenario the CCI occurs and cause high packet loss and interruption. This problem only happens when the two routers are working on a same channel or using non overlapping channels.
There are 25 non-overlapping channels in 5 ghz band so it’s almost impossible that a CCI (Co-channel interference) occur.
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