The way DFS works on your router is fairly simple. Through a bunch of technological wizardry, it looks to see if those channels are being used. If not, then it shuts them down. See, Wi-Fi channels work similarly to lanes on a highway. The more lanes there are, the less crowded everything gets.
But when there are more cars around, things become crowded, and some lanes become faster than others. Now, not a lot of routers have this yet, but one of ours does. All rights reserved. Connect with. Remember Me. Obviously there are times when we need to use a large channel plan.
Yes, your WLAN could be even more efficient if you used more channels, but at what cost to the quality of the connection and the roams, and the risk of phantom issues later? This is why I dislike DFS channels. There are only 4 in Europe, it is very challenging to establish a radio plan with such few channels. No, I am not recommending a 4 channel plan in Europe. Sadly we just have to accept that our channel plan will contain DFS channels in Europe.
If you can avoid the DFS channels then great. But if you need 8 channels then make sure 4 of them are the non-DFS channels. Great article and I agree in principle and in my deployments. Stick with Eight and your 5Ghz Wi-Fi will be great! Very good article. Could you please indicate what is the ETSI requirement that specifies that this must happen at least once every 24hrs and for a minimum of 60s?
You can see that section 4. I cannot remember what part of the document states 24hrs but its in there somewhere! Thanks for your reply. If you could please inform where is that reference on the ETSI Hi Sergio, thanks for picking up on this! It looks like I transplanted this requirement from the EN standard for Broadband transmitters.
It was a great learning experience and hoping to learn more from the question below! Does the iPhone have this same or similar ability? Do other cell phone brands? Yes, iOS absolutely keeps track of the channels known to be around it, either from its own scanning or from 11k reports, and scans a subset of channels instead of the full list.
Question though, why not stick with 2. There are only 3 or 4 usable channels anyway, and there is no DFS. On your 5Ghz you can dump all your high bandwidth services. Background Wi-Fi networks operate in areas of RF spectrum that require no licence to operate. This is in contrast to many other areas of the radio spectrum that generally require some form of paid-for licence to operate radio equipment.
All wireless services are generally subject to a range of enforceable technical restrictions to ensure they operate in a manner that will minimize interference to other wireless services. This may include restrictions on parameters such as RF transmit power levels and limiting the spectral characteristics of transmitted signals e.
Even though they may be licence-exempt, Wi-Fi networks are still subject to restrictions to minimize their impact on other wireless services and equipment in the same areas of spectrum used by WLANs.
One particular service that shares spectrum with wireless LANs is radar. Some types of radar installation operate in the 5GHz band that is used by Wi-Fi network. This means that they may use some of the same frequencies that are used for Wi-Fi networks.
The AP will listen for 60 seconds for the presence of radar signals. In some regions, where channels — are allowed for use by Wi-Fi networks, there may be an increased channel availability check of 10 minutes. This means that the 5GHz radio is not available until 10 minutes after the access point has booted up. This extended checking period is due to weather radar restrictions on those channels. The AP must continuously monitor its channel for the presence of radar signals.
At the end of this period, the AP will have ceased transmissions and moved to a new channel. Support for this on both WLAN infrastructure and client equipment seems to be optional from my own observations and should not be relied upon as a reliable method for clients to find the AP on its new channel. Experience shows that there are variations between WLAN solutions around which channels an AP will choose to move to when radar is detected.
In some solutions, APs that detect radar will move to channel 36 exclusively. Behaviour in this area seems to be inconsistent and is not defined within the This is a minute period in which no further transmissions will be made by the AP on the affected channel.
At the end of the minute period, most APs will attempt to return to their original channel, subject to a channel availability check. Social impact. Support Support Support Close. Support overview. Mobile support overview. Account management. International trip planner. Order status. Download My Verizon App. Community Forums. Home support overview. Fios Internet.
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