What are the 5Ghz non-DFS, non-overlapping channels?

Laura:

Not all of the channels in the 5 Ghz band are useable all of the time. If you are near an airport then some of the 5 Ghz channels are not available to you. DFS stands for Dynamic Frequency Selection so basically you have that feature turned on and your APs will listen for Radar or first responders using those 'shared' frequencies and not use those channels if they are being used.

Check this out.

John

I'm not an expert on the US regulatory domain so here a link to wikipedia...
http://en.wikipedia.org/wiki/List_of_WLAN_channels

The 5GHz channels don't overlap, BUT if you use channel bonding for 802.11n or 802.11ac to bond more channels to a 40 or 80 MHz channel you'd need to make sure you don't overlap.

In the latest controller version the GUI also show which of your 5GHz channels are non-DFS - just choose custom channel plan and you get the list.
The below screenshot is for AP country set to Austria ...

Thanks,
We use the non DFS channels: 36, 40, 44, 48, 149, 153, 157, 161
At some schools we use 40Mhz and other school use 20Mhz. I don't know why.

Here another slide that illustrate how channel width affects the available non-overlapping channels...

So if I were to use 5Ghz, non overlapping. non DFS channels at 40MHz, I could use 36 , 44, 149, and 157? Would that work?
Thats right. In this case you bond channels to 40 MHz channels with the upper channel selected as second channel. This results in bonding of channel 36 with 40, 44 with 46, 149 with 153 and 157 with 161. This creates a 4 channels (like a 4 channel plan) usable to develop a non-overlapping channel sheme.

Any reasons why you don't want use DFS channels? If you need smaller cell size design (voice over wifi or high density setup require this) using all available channels is i most case required to prevent channel overlapping. I some case using only 20 MHz channels even for 802.11a/n (5 GHz) is needed for scalability and higher performance even with a lower max. PHY rate thats possible with 20 MHz.

What application do you design your wifi for?

So if I were to use 5Ghz, non overlapping. non DFS channels at 40MHz, I could use 36 , 44, 149, and 157? Would that work?
I don't see neighboring APs on the same channel either.

So if I were to use 5Ghz, non overlapping. non DFS channels at 40MHz, I could use 36 , 44, 149, and 157? Would that work?
What is a good free spectrum analyzer program? or low cost

So if I were to use 5Ghz, non overlapping. non DFS channels at 40MHz, I could use 36 , 44, 149, and 157? Would that work?
Thanks for all the info. Since we have the enterasys 3605 APs, there are 2 radios. one is set to g/n 20MHz and one is set to a/n 40MHz. When i get an AP up and running and attach to it, my transmit rate on my MacAir says its 300Mbps. Does that mean I am sharing that 300Mbps with everyone else that is on the same radio as me? I dont actually get 300 Mbps to my self, do I?

Each radio should be transmitting 300Mbps, which is just the connection from the wireless device to the Access Point.

So if I were to use 5Ghz, non overlapping. non DFS channels at 40MHz, I could use 36 , 44, 149, and 157? Would that work?
Like Ronald told you at 300 mbps PHY rate you could assume about 145-150mbps throughput with iperf (udp) for a device like a laptop with a wifi adapter 2x2:2 MIMIO or better. Most tablets only have 1x1:1 MIMO wifi adapter limiting there speed to around 65 mbps throughput.

For more deeper understanding of wifi throughput i would recommend you watching this video and the reading to background pdf:

http://www.wlanpros.com/wi-fi-stress-test-a-vendor-independent-access-point-analysis/

Still waiting for the second round of the wifi stress including the extreme wireless access points.

So if I were to use 5Ghz, non overlapping. non DFS channels at 40MHz, I could use 36 , 44, 149, and 157? Would that work?
If the client is connected to the AP/controller you'd look into the GUI > Report > Clients.
The column Avg. Rate Sent/Rec gives a small clue what the client is capable off.

-Ron

Laura,

Hope this helps

On a related topic, here's a link to a 5GHz Channel Planning Guide/Best Practice.

GTAC Knowledge:
https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-create-a-5GHz-WiFi-Channel-Plan

Hub Thread:
https://community.extremenetworks.com/extreme/topics/5ghz-channel-planning-guide-best-practices

Good reference

Hi,

In middleeast and asia

how is the non-dfs channel allocated ?

Can we use dfs and non dfschannel together ?

Thank you