Wifi - 2.4, 5 or 6 GHz? Wi-Fi 5, 6 or 7? A Simple Guide

vihangvasa

39 minutes ago

5 min read

Most people buy Wi-Fi by the number on the box. That number tells you less than you think. Here is what actually matters.

◆ First, Wi-Fi is light you cannot see

Wi-Fi is an electromagnetic wave, the same family as the light from a bulb, only at a much lower frequency. The two behave in a similar way. The closer you are, and the fewer things in between, the stronger it is.

The light-bulb test: Picture a bare bulb where your access point is mounted. Wherever that bulb would light a spot directly, with nothing in the way, your Wi-Fi will be at its strongest. Corners in shadow, behind a concrete column or a staircase, are where the signal gets weaker.

Two warnings. Wi-Fi can pass through some walls that light cannot, but every wall costs signal. And some things that let light through stop Wi-Fi cold: large mirrors, tinted or energy-saving glass, metal sheets, and even an aquarium (water soaks up Wi-Fi).

◆ The three bands: the roads your data drives on

Band	Strength	Weakness
2.4 GHz	Longest reach, best through walls	Slowest; crowded by neighbours, Bluetooth and microwave ovens
5 GHz	Fast, much less crowded	Shorter reach; struggles through thick walls
6 GHz	Fastest, cleanest, almost no interference	Shortest reach; needs a newer phone or laptop

A simple rule: the higher the number, the faster it goes, and the shorter the distance. That is why good homes use several access points instead of one powerful router.

India legally opened the lower 6 GHz band for indoor Wi-Fi in January 2026, so 6 GHz is now a real option here.

◆Frequency, Channel and Channel Width: the three words everyone mixes up

Think of your Wi-Fi as traffic on a highway.

1. Frequency (the band) = which highway 2.4 GHz, 5 GHz and 6 GHz are three different highways. Each has its own speed and reach, as the table above shows. Your devices pick one highway at a time.

2. Channel = which lane on that highway Each highway is divided into lanes, called channels. Your Wi-Fi uses a lane, and your neighbour’s Wi-Fi uses a lane too. If you both pick the same lane, you slow each other down, like two buses fighting for one lane.

On 2.4 GHz there are only three lanes that don’t overlap: channels 1, 6 and 11. That is why 2.4 GHz feels crowded in apartment buildings. The 5 GHz and 6 GHz highways have many more lanes, so they are far less crowded.

3. Channel width = how wide the lane isA lane can be 20, 40, 80, 160 or, with Wi-Fi 7 on 6 GHz, 320 MHz wide. A wider lane carries more data at once, so it’s faster. Double the width and you roughly double the speed.

The catch: wider lanes mean fewer lanes fit on the highway. In a busy building, a very wide lane is more likely to overlap with a neighbour, and it picks up more noise, so the signal doesn’t reach as far. Wider is faster up close and worse in a crowd.

◆ What we do in practice:

2.4 GHz: 20 MHz, on channel 1, 6 or 11. Never wider.
5 GHz: 40 or 80 MHz, depending on how crowded the area is.
6 GHz: 160 MHz, or 320 MHz with Wi-Fi 7, where the highway is still quiet.

So the right setting isn’t the biggest number. It’s the one that suits your home and your neighbours. This is part of what a proper Wi-Fi survey works out.

◆ The three generations: the cars on those roads

Generation	Bands	Strength	Weakness
Wi-Fi 5(802.11ac)	5 GHz	Proven, cheap	Struggles once many devices connect at once
Wi-Fi 6 / 6E(802.11ax)	2.4 + 5 GHz (6E adds 6 GHz)	Handles dozens of devices smoothly, saves phone battery	6 GHz needs 6E hardware
Wi-Fi 7(802.11be)	2.4 + 5 + 6 GHz	Very low lag; can use more than one band at once (Multi-Link Operation); widest channels	Costs more; your devices must also support Wi-Fi 7 to get the full benefit

The real gain from Wi-Fi 6 and 7 is not just speed. It is calm under load: thirty devices, two 4K streams and a video call, all at once, without the network falling over.

◆ Why we install Alta Labs

A fast access point on paper means nothing if it drops connections every evening. Here is why I install Alta Labs:

Wi-Fi 7 done properly. The AP7-Pro runs all three bands, with 4×4 radios on 5 GHz, and a 10 Gbps cable connection so the wire never holds the wireless back.
Strong performance from Wi-Fi 6 too. The AP6-Pro borrows a speed feature from Wi-Fi 7 (4096-QAM) while working with the devices you already own.
Smooth roaming. You can walk from bedroom to terrace on a video call, and your phone moves between access points without dropping.
AltaPass. A patented feature that lets one network name use different passwords, for family, guests and staff, each kept separate.
Built-in filtering and full cloud management, at no extra subscription cost.
Design you don’t have to hide. Compact, clean units that sit well on a well-finished ceiling.

But hardware is only half of it. Reliable Wi-Fi comes from placement, cabling and tuning, and that is the part we do.

◆ The takeaway

2.4 GHz reaches far, 5 GHz is the everyday workhorse, and 6 GHz is the fast lane.
Pick the right lane and the right lane width. The widest setting is not always the fastest in real life.
Wi-Fi 6 is the sensible baseline today. Wi-Fi 7 is the right choice if you are wiring a home for the next decade.
Several well-placed access points beat one big router, every time.

◆ If your Wi-Fi feels slower than your internet plan, the problem is almost never the plan.

◆ Your Wifi Specialist in India

Technology is only as good as the team that deploys it. Photonics Enterprise is a certified Alta Labs specialist based in Mumbai, providing professional site surveys, RF planning, and network design tailored to your premises. Their offer rapid on-site support, in-house IT team training, and ongoing post-sale monitoring — with a direct escalation channel to Alta Labs global engineering when needed.

Alta Labs products are available in ready stock through Photonics Enterprise, allowing immediate deployment without the usual procurement delays.

Part of the Photonics Enterprise culture is to share knowledge openly with interested and like-minded people, to build new relationships, and to evolve together. If anything in this guide raised a question, we would be glad to talk it through.

To arrange a demonstration or a conversation, please get in touch with Photonics Enterprise.