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Why my ERA 100 just can't detect my 5G WIFI?

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My router is LINKSYS WRT1900ACS. It broadcasts 2.4G and 5G in different SSID. But the 5G SSID never shows up in the ERA 100 WIFI connection list. My ERA 100 works well with 2.4G, but it can't detect my 5G WIFI, and can't get connected by manually input.

My other devices, ipad, computer detects and works well with my 5G WIFI.

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Stanley_4Answer

Grand Maestro

What channel is your 5 GHz network on? Try changing it to something in the 36-64 range as a test.

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ratty

I don't know why channel setting is so important to SONOS.

It isn’t. My system’s currently working on channel 112 (5560 MHz).

Maybe your router is a bit quirky.

Allowed Wifi frequencies vary by location, so maybe the OPs router is set for one country and the Sonos gear for another? Or maybe it is trying 6GHz? OP doesn’t list their location.

The OP’s router is dual band. My point was that Sonos gear works on DFS channels without issue. It’s conceivable that the router held back from transmitting, beyond the statutory scanning period at startup.

Stanley_4

Grand Maestro

For a bit of info on why DFS channels shouldn’t be your first choice, particularly when adding new devices this has some good information. Once working, and if the channels are clear in your area there is no reason to avoid them.

https://wifinc.net/dfs-channels-and-why-to-avoid-them-even-though-you-say-you-cannot/

What is a DFS channel? These channels share the spectrum with Weather Radar and Radar systems. For the FCC and IEEE to approve the use of these channels in WIFI, a mechanism had to be in place where these channels could co-exist. A mechanism called DFS (Dynamic Frequency Selection) was created to have the WIFI devices listen for radar events and either stop using the channels or automatically move off these channels. When RRM/ARM is used, and an AP hears a radar event it must pick a new channel and inform its clients to move to this new channel. If RRM/ARM is not used, then AP after hearing a radar event must stop transmitting for 30 minutes. (much more there)

ratty

My ASUS AX mesh chooses 160MHz DFS channels by itself.

Ken_Griffiths

My understanding from an article I came across online a while ago, is that these are the DFS channels we are allowed to use at Home and that there are some slight differences for US & Canada…

52-64, 100-144 in the US
52-64, 100-116, 132-144 in Canada
52 to 64, 100 to 112 and 132 to 140 Rest of the world

Stanley_4

Grand Maestro

A lot of defaults are set to give pretty results when being tested by folks doing reviews, bigger numbers are the highest priority. I tend to go for maximum stability when starting out and only bump things up if I need the speed (I don’t yet) and things still work well.

The article isn’t about Sonos but very similar low-latency, delay intolerant voice streaming gear and makes some interesting points I thought might apply here.

Since I don’t use the DFS channels I haven’t looked into what Sonos does when a DFS channel has to be vacated due to a radar being detected. If I can’t find a usable non-DFS channel I’ll probably have to look into that but I’d rather not.

Stanley_4

Grand Maestro

Channels for 5 GHz by country. The 2.4 channels are earlier on the same page.

https://infogalactic.com/info/List_of_WLAN_channels#5.C2.A0GHz_.28802.11a.2Fh.2Fj.2Fn.2Fac.29.5B17.5D

ratty

My understanding from an article I came across online a while ago, is that these are the DFS channels we are allowed to use at Home and that there are some slight differences for US & Canada…

52-64, 100-144 in the US
52-64, 100-116, 132-144 in Canada
52 to 64, 100 to 112 and 132 to 140 Rest of the world

UK: 52-64, 100-144, plus 149-173 but those are short range/low power only

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