Wi-Fi Standards Explained: From 802.11n to Wi-Fi 7

The router box says "Wi-Fi 6" and "AX5400" and "up to 5.4 Gbps". Your phone says it is connected at 866 Mbps. A speed test reports 300. All three numbers are real, and none of them contradict each other. This post explains why.

Wi-Fi naming is one of the few things in tech that got clearer over time. Here is the full map, and the few things that actually matter when you read it off a screen.

The names finally line up

For two decades, Wi-Fi was named after its IEEE spec number: 802.11 plus a letter. The letters told you nothing unless you had memorized the order they shipped in. In 2018 the Wi-Fi Alliance switched to generation numbers, and they map one to one:

Two things to note first. Wi-Fi 6E is not a new generation - it is Wi-Fi 6 with access to the 6 GHz band. And the switch from letters to numbers happened mid-stream, which is why 802.11ax has two names.

The number on the box is not real

You will never see the "max PHY rate" from that table. It is worth knowing why, because it is the gap between what you pay for and what you get.

The advertised number is the physical-layer rate: every antenna running at once, on the widest channel, at close range, with a perfect signal, added up across all streams, before any protocol overhead. Real throughput is lower, for reasons that add up:

• Your device has fewer antennas than the router. A router may have four or eight streams; a phone has one or two. The link runs at the phone's limit, not the router's. This is the biggest gap.
• Protocol overhead eats 30-40%. Acknowledgements, headers, and management frames are not payload. An "866 Mbps" link delivers maybe 500-600 Mbps of real data on a good day.
• The air is shared. Every other device on the channel, plus your neighbours' networks, takes turns in the same space. Fifteen devices means each one waits for the others.
• Signal drops with distance. As dBm falls, the radio steps down to a slower, more reliable encoding. The rate you get in the same room is not the rate you get two walls away. That link between signal and speed is covered in the Wi-Fi basics post.

So "AX5400" is a 4804 Mbps 5 GHz radio plus a 574 Mbps 2.4 GHz radio - and no single device ever reaches either one. It is not a lie. It is just not a number you will ever see.

What each generation actually changed

Wi-Fi 4 (802.11n) added MIMO - multiple antennas sending separate streams at once - and 40 MHz channels. It is the oldest standard still worth having. Anything older tops out at 54 Mbps.

Wi-Fi 5 (802.11ac) went wider (80 and 160 MHz channels) and added more streams, but only on 5 GHz. Its 2.4 GHz radio is still Wi-Fi 4. That is why an "ac" router feels fast up close and average at range: at distance it falls back to the older, slower band.

Wi-Fi 6 (802.11ax) is the one people get wrong. The headline is 9.6 Gbps, but the real win is not peak speed - it is handling many devices at once. A feature called OFDMA lets the router serve several devices in a single transmission instead of taking them strictly one at a time. In an empty house, Wi-Fi 6 barely beats Wi-Fi 5. In a flat with forty devices and busy neighbours, it feels completely different. If your problem is a crowd, this is the fix - not a bigger number.

Wi-Fi 6E is the same 802.11ax chip with access to the 6 GHz band: a large, brand-new stretch of spectrum with no old devices and, for now, few neighbours. The tech did not change; the space it runs in did. This is often the single biggest real-world upgrade, because empty spectrum beats clever protocol tricks.

Wi-Fi 7 (802.11be) adds three things: 320 MHz channels (double Wi-Fi 6E's widest), denser encoding called 4096-QAM, and the headline feature, Multi-Link Operation - one device using two bands at once, either combining them for speed or switching between them to dodge interference and cut latency. MLO matters more for gaming and calls than the 46 Gbps number ever will.

Both ends set the ceiling

The rule that decides which upgrade is worth buying: a Wi-Fi link runs at the level both ends support.

A Wi-Fi 7 router with a Wi-Fi 5 laptop gives that laptop a Wi-Fi 5 connection. The router's generation is the ceiling; your device's generation is usually the floor you actually get. Before buying a router a generation ahead of everything you own, be clear that the gain is future-proofing and better handling of other devices - not a faster link for the old ones.

6 GHz makes this concrete: the best feature in Wi-Fi 6E and 7 needs a phone or laptop with a 6 GHz radio on the other end. No 6 GHz client, no 6 GHz benefit, whatever the router can do.

Backward compatible, at a cost

Every generation talks to older ones - a Wi-Fi 4 printer joins a Wi-Fi 7 router fine. But a network serving a slow old device spends airtime on it, and that airtime comes out of everyone's share. A single 802.11b device from 2003 can noticeably drag a modern network, because it holds the channel far longer to send the same data. If something old does not need Wi-Fi, give it Ethernet or retire it.

What to actually check

You do not have to trust the box. The two numbers that describe your real connection are on the phone in your hand:

• The negotiated standard and link speed - which generation you actually connected at, and the PHY rate you actually got. If a Wi-Fi 6 phone shows a Wi-Fi 5 link, something (band, distance, a router setting) capped it.
• The band and channel width - whether you landed on 2.4, 5 or 6 GHz, and at 20, 80, 160 or 320 MHz. A "Wi-Fi 6" connection stuck on 2.4 GHz at 20 MHz is Wi-Fi 6 in name and last-decade speed in practice.

NetTools: Network Analyzer shows the link speed, band, channel width and BSSID of the network you are on, so you can see which generation you actually get - not the number printed on the box. Where to place the router to hold that rate is a signal question, and that is the Wi-Fi basics post.

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Cover photo by User_Pascal on Unsplash.