Community discussions

MikroTik App
 
VoltarGomes
just joined
Topic Author
Posts: 1
Joined: Sat Nov 21, 2020 11:37 am

Strange behaviour on 5 GHz radio with 6.46.x RouterOS?

Sat Nov 21, 2020 11:47 am

Hi,

I am not sure when it started to happen, but IMO after upgrading to 6.46.x firmware. I have tried both hAP ac2 and brand new (bought today) RB4011iGS+5HacQ2HnD-IN.

Let's focus on hAP ac2 as first.
When it starts up, the 5 GHz starts broadcasting SSID, devices are connecting to it, and then it disappears for a while (20-30 secs) and comes back. Then it has problems with keeping up the signal. It doesn't matter if it's under CAPsMAN or normal (out-of-the-box config).

RB4011 does similar, however, it takes much, much, much longer for 5 GHz radio to start broadcasting SSID. When it's under CAPsMAN it is a bit longer, however in the log you can read that it is started up, but no information appears in Wireless section. After 1,5-2 minutes it starts broadcasting and works until it's turned off and on (you don't have to reboot router to repeat the situation, if you turn radio down and up it is the same). Is this normal? I have checked 6.46.2 and 6.47 beta - the same.
 
andriys
Forum Guru
Forum Guru
Posts: 1391
Joined: Thu Nov 24, 2011 1:59 pm
Location: Kharkiv, Ukraine

Re: Strange behaviour on 5 GHz radio with 6.46.x RouterOS?

Sat Nov 21, 2020 2:11 pm

Sounds like the DFS (radar detection) in action to me. Search the forum, there is plenty of information about it here.
 
User avatar
bpwl
Forum Guru
Forum Guru
Posts: 1081
Joined: Mon Apr 08, 2019 1:16 am

Re: Strange behaviour on 5 GHz radio with 6.46.x RouterOS?

Sat Nov 21, 2020 5:49 pm

In 5 GHz DFS starts at 5500 MHz (channel 100) upward till 5700. Channel 120-128 (5600-5640 MHz) are the weather channels.

DFS has to be silent for 1 minute, after every change to the WLAN setting, and by any radar signal detected (what forces a freq change).
The same for the weather channels, only it is 10 minutes then.

If you are on "auto" freq setting, it's the lottery. You don't know what you will get.
If you use wide channels (e.g. 80 MHz= 4 channels wide) then just one of them could be DFS or weather channel, and the AP will remain silent for the mandatory time.

Who is online

Users browsing this forum: Google [Bot] and 41 guests