Kitz Forum

Broadband Related => FTTC and FTTP Issues => Topic started by: Edinburgh_lad on December 24, 2021, 11:12:48 AM

Title: Radar and VDSL
Post by: Edinburgh_lad on December 24, 2021, 11:12:48 AM
Greetings

I was wondering if anyone knows the effects of a radar on VDSL signal? My Fritzbox has detected 'radar' in the vicinity :'( and while I know its impact on 5GHz WiFi, I know nothing about its effect on VDSL, if any. (There seems to be some kind of relationship between when the radar was detected and 'dripping blood' spikes, but this, of course, could be coincidental.)

Thank you.
Title: Re: Radar and VDSL
Post by: j0hn on December 24, 2021, 01:05:32 PM
Quote from: Edinburgh_lad on December 24, 2021, 11:12:48 AM
Greetings

I was wondering if anyone knows the effects of a radar on VDSL signal?

None what so ever.

The Fritzbox will be detecting radar on the DFS channels as is (was) required by regulation to prevent residential 5GHz WiFi interfering with radar.
AIUI OFCOM have relaxed the 5GHz DFS channels now but I'm yet to see any routers implement the changes.

All UK radar uses frequencies way above the VDSL2 spectrum.
Title: Re: Radar and VDSL
Post by: Edinburgh_lad on December 24, 2021, 01:14:46 PM
Thank you very much.
Title: Re: Radar and VDSL
Post by: meritez on December 24, 2021, 01:54:00 PM
Quote from: j0hn on December 24, 2021, 01:05:32 PM
None what so ever.

The Fritzbox will be detecting radar on the DFS channels as is (was) required by regulation to prevent residential 5GHz WiFi interfering with radar.
AIUI OFCOM have relaxed the 5GHz DFS channels now but I'm yet to see any routers implement the changes.

All UK radar uses frequencies way above the VDSL2 spectrum.

Mikrotik have made this change:
OFCOM statement was here in 2020: https://www.ofcom.org.uk/__data/assets/pdf_file/0036/198927/6ghz-statement.pdf
Title: Re: Radar and VDSL
Post by: Alex Atkin UK on December 25, 2021, 03:36:51 AM
Quote from: j0hn on December 24, 2021, 01:05:32 PM
The Fritzbox will be detecting radar on the DFS channels as is (was) required by regulation to prevent residential 5GHz WiFi interfering with radar.
AIUI OFCOM have relaxed the 5GHz DFS channels now but I'm yet to see any routers implement the changes.

Its only relaxed on band C which very few clients support as it required the end user buy a license from OFCOM to use before.

I had this argument with Zyxel as their AP doesn't support it as they claimed "most clients do not" but newer clients (Windows 11 with WiFi 6/6e cards) do which to me is the whole point of going WiFi 6, to use WiFi 6 clients.  The issue I believe is they have to pay to have their devices certified again if they enable new channels, to make sure they don't create undue interference outside their spectrum.

I mean you'd think they would do that as a matter of course for the entire band the chipset can handle, but it seems not.