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Wi-Fi 802.11ac 1.7 Gbps (160MHz channels) advisory

Networking Forum - forum.notebookreview.com
Hello and welcome to a thread dedicated to 802.11ac Wi-Fi and specifically to questions and issues related to 160 MHz channels.

802.11ac standard has been with us for a while now and so were - in theory - 160 MHz channels, however there were no Wi-Fi cards capable of 160Mhz channels until Intel 9260 came along, so that part is new.

As such people are not aware of specific issues that arise only or mostly when those channels are used.

Let's get through some of the basics:

1. How 160 MHz channels came to be?

These channels are either two continuous 80MHz channels bonded together (usually designated as 160) or two separate (not continuous) 80 MHz channels working together (usually designated as 80+80).

The second type - 80+80 is far better for a couple of reasons - one is that it's hard to find a clear/free 160MHz of 5GHz band but it's much easier to find free 80MHz, so one could use two free channels to form one super-channel

Secondly one could use two non-DFS channels to form 160MHz channel i.e. one from the lower part of spectrum (channels 36-48) and one from the upper part (149-165) omitting the middle part where DFS is required.

This all sounds great but not all of the routers support 80+80 and moreover we are not sure that Intel 9260 and its twin Killer 1550 even support that.

2. What the hell is DFS?

DFS is Dynamic Frequency Selection - it's goal is to stop routers and other 5GHz devices interfering with weather radars (see this file if you're interested in details - The idea is that the router will detect specific radar patterns and will switch channels to avoid causing interference.Also once the router is booted up, before the 5 GHz radio starts it's going to scan the channel to make sure it can be used without causing interference to any radar installations.On most channels that scan takes 1 minute and in that time it might seem like 5GHz radio is not working, but on some channels it takes 30 minutes (I don't have a source for that but it seems on upper channels)See


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