Can we explain CCI/ACI with this example?

[eigrpy]

Hello, Can we use the example below to explain CCI/ACI? Now we have two APs. Can we think below conclusions?

If AP1 is using channel A and AP2 is using channel A as well, we can think the two APs have CCI, no ACI

If AP1 is using channel A and AP2 is using channel B or C, we can think the two APs have ACI, no CCI

If AP1 is using channel A and AP2 is using channel D, we can think the two APs do not have no ACI and CCI as well. 

Thank you

[Scott Fella]

What are you asking? What you stated is correct using two aps as an example.

[eigrpy]

Thank you Scott for reply. If these conclusions are correct, can we say both CCI and ACI are not related with physical distance? For example, if AP1 is using channel A and AP2 is using channel D, it does not matter if the two APs are 1 meter apart or even 30 meter apart?

[Scott Fella]

Distance is not what is a factor here. It’s either channel overlap or adjacent channel interference. Signal strength makes a difference for interference and CCI.

[eigrpy]

Thanks for your confirming. Based on the concept, at a certain size building area, adding more APs(than normal standard) does not impact CCI and ACI if adjusting channel correctly. but it would cause more serious CCI or ACI if adjusting channel incorrectly. Can we say it like this?  

[Scott Fella · Accepted solution]

In theory, yes, but you can’t control RF especially from adjacent neighbors in a building, hotspots enabled on cellphones and devices that can cause interference. These days you just need to trust RRM as much as possible, you will not be able to make changes like what an algorithm can.

[eigrpy]

Thank you Scott for your explanation. One more question, in reality, its really hard to avoid CCI and ACI completely in a large wireless network. Do we have a indicator that can tell its maximum that can be allowed so that users still can communicate under the environment? 

[Scott Fella]

Again, the algorithm will make changes if needed. With many wireless networks that auto-tune per say, channels will change and is usually never static anymore. Majority or access points or wireless systems have to ability to change channel and power to make rf “better” for that environment. That means it can affect or make another environment worse. What you need to think about is proper ap placement for density and roaming. CCI and ACI is something you look into for troubleshooting. Environments are very different also, if you look at a downtown high rise building as an example, you would see many neighbor wireless that can and would interfere with your network. Now the algorithm would help and even with CCI and ACI, you can still have good or great user experience. Don’t read into things too much. The more environments you implement and validate, you will see how these environments vary and also the user’s experience varies also from state to state, country to country.

[eigrpy]

Thank you Scott!