A Cygnus Business Services brand
When someone tells me their office Wi-Fi is slow, my first question is whether the problem is the Wi-Fi at all. Often it's the internet connection, an old router, or one device misbehaving. The fix is different for each, so find out which one you have before you buy anything.
Step one: is it the Wi-Fi or the internet?
Plug a laptop into the network with a cable, as close to the firewall or router as you can, and run a speed test. Then run the same test over Wi-Fi from the desk where people complain.
- Both are slow. The problem is your internet service or the router or firewall in front of it. More Wi-Fi gear won't help.
- Wired is fine, Wi-Fi is slow. It's a Wi-Fi problem. Read on.
- Both are fine, but calls still drop and pages hang. You may have intermittent problems that a single test misses: packet loss, a struggling firewall, or DNS trouble. That needs monitoring over a few days, not a one-off test.
Run the tests at a busy time of day too. A connection that's fine at 7 a.m. and falls over at 10 a.m. is telling you something about capacity.
The usual causes
The ISP router is doing everything
The box your internet provider installed is a modem, a router, a firewall, and a Wi-Fi access point, all in one cheap unit. It's built for a household, not an office of 20 people on Teams calls. It sits in a closet or under a desk, so its signal is weakest exactly where people work.
The usual fix is to put the ISP box in bridge mode (or turn its Wi-Fi off), run a business firewall behind it, and serve Wi-Fi from separate ceiling-mounted access points. UniFi, Meraki, Aruba Instant On, and Fortinet all make gear that suits small offices. Which one fits depends on your budget, how many sites you have, and who'll manage it.
Access points in the wrong place
Access points belong on the ceiling, in the middle of the space they cover, not in the network closet where the cables happen to end. Walls matter too. Plenty of businesses around Dover, Exeter, and Newmarket work out of old brick mill buildings, and thick brick walls stop Wi-Fi far more than drywall does. So do the metal shelving in a warehouse and the concrete around an elevator shaft.
More access points isn't always the answer, either. Too many at full power, too close together, and they interfere with each other. Placement and power settings matter more than count.
Mesh extenders and repeaters
A wireless repeater fixes coverage by rebroadcasting a weak signal, and in most setups every hop costs you speed. It's fine for a back bedroom at home. In an office, every access point should be cabled back to a switch. If running cable is hard, that's the conversation to have, not a fourth extender.
Crowded 2.4 GHz
The older 2.4 GHz band has only three channels in the US that don't overlap: 1, 6, and 11. In a shared building with a dozen neighbors' networks, those channels are full. Microwave ovens operate in the same band, which is why the break room can be a dead zone at lunch.
Steer laptops and phones to 5 GHz, and to 6 GHz if you have Wi-Fi 6E or Wi-Fi 7 gear and devices that support it. Keep 2.4 GHz for older devices and things like label printers and sensors that need it. Set channels deliberately instead of trusting "auto" on every access point.
One slow device holds up the rest
Wi-Fi is shared airtime. An old laptop with an ancient wireless card, or a device at the edge of coverage, talks slowly and uses more of that airtime. Modern access points handle this better than older ones, but a ten-year-old access point with a ten-year-old laptop on it will drag down everyone nearby.
Everyone is on one network
Staff laptops, the guest network, the security cameras, the smart TV in the conference room, and the payment terminal should not share the same network. Separate them with VLANs and separate SSIDs: one for staff, one for guests, one for devices. It helps performance a little and security a lot. A visitor's infected phone should never be able to see your file server.
What a proper setup looks like
For a typical small office, something like this:
- A business firewall with a current security subscription
- The ISP equipment in bridge mode, or at least with its Wi-Fi off
- Ceiling-mounted access points, each wired back to a switch with Power over Ethernet
- Two or three networks (staff, guest, devices), each separated
- WPA3 where your devices support it, WPA2-AES at minimum, and no shared password that's been on the wall since 2017
- Someone watching the controller dashboard for problems before staff call
On a bigger or oddly shaped space, like a warehouse, a multi-floor building, or a medical office with lead-lined imaging rooms, a site survey before you buy is worth it. We handle these as fixed-scope projects. It tells you where to put access points and how many you need.
What to do this week
- Run the wired versus wireless speed test above, at a busy time of day.
- Find your access points. Write down where each one is and how old it is.
- Check whether the ISP router's Wi-Fi is still on alongside your own access points. If it is, you may be running two networks that fight each other.
- Confirm guests are on a separate network from staff, and change the guest password if it hasn't been changed in a year.
- Note the places people complain about. Coverage problems are almost always in specific spots.
Questions people ask
Will a faster internet plan fix our slow Wi-Fi?
Only if the internet connection is the bottleneck. If a wired speed test is fast and Wi-Fi is slow, a faster plan won't help. Fix the Wi-Fi first.
How many access points does a small office need?
It depends on the space, the walls, and how many people and devices are using it at once, more than on square footage alone. A small open office may need one or two. A building with thick walls or several floors needs more, placed carefully.
Is mesh Wi-Fi good for business?
Consumer mesh systems that link wirelessly lose speed with each hop. Business systems where every access point is cabled to a switch work far better. If your "mesh" units are plugged into the network with cables, you're already most of the way there.
Brady McNeill is the founder and CEO of Dreamline Technology. He has spent 12+ years running IT and security for small and mid-sized businesses across New England.