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Yesterday I received a Fire 7 (9th Gen) Tablet. According to the official datasheet, it supports dual-band 802.11n Wi-Fi. To my surprise, the SSID of my 5GHz Wi-Fi router didn't show up. After talking to support it was explained to me that the device only supports the channels 36, 40, 44, 48 on the 5GHz band. At the same moment, my router doesn’t allow me to specify the channel it is using.
So I talked to both support staff for the tablet and the router. The ISP who is the provider of my router is stated:
It's the tablet's fault it should be able to scan on all channels. Other devices can connect on the 5GHz band without problems.
The Amazon support, on the other hand, stated:
It’s the router's fault, it should be able to specify the channel it is using. The tablet can connect to other 5GHz Wi-Fis without problems.
So my question is: Which device violates the 802.11n protocol standards? Or is it totally valid that two devices which both support 802.11n on the 5GHz band aren’t able to connect?
26I don't know formal details, but the idea of WiFi device only being able to operate on a few select channels is crazy, especially on the 5 GHz band where channels don't overlap. – gronostaj – 2019-11-28T10:55:41.610
3Please edit your question: What is the make and model number of the Wi-Fi router and what country are you in? – JakeGould – 2019-11-28T14:46:16.890
3Can you specify what country the router and tablet were sold for? It is not unusual to have different variants of the same equipment which support different channels based on the country they are designed for, for instance, so if you bought one of the two in a different country, then you may easily end up with this kind of issues (though it's not the only possible reason). – jcaron – 2019-11-28T22:40:31.510