WLAN Pros Library

Explained guide By Keith Parsons, CWNE #3

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A plain-English guide

Cameras, Doorbells
and Baby Monitors,
Explained

A camera is the rare gadget in your home that sends more than it receives. Make yours record when it matters, and keep strangers out of it.
your camera the box upload the cloud
Keith Parsons · CWNE #3
Current as of September 2026
WLAN Pros
Start here

The short answer

Most gadgets in your home pull things in. A camera pushes video out, often all day.

That one fact explains most camera trouble. Clips start late. Live video spins. The doorbell drops offline. Each usually comes down to three things: how much your internet can send, how well the camera hears your Wi-Fi, and where the video ends up.

The one idea to rememberA camera is judged by what it can send, from the spot where it hangs.

What's inside

The camera sends3
How many cameras your line can carry4
Signal at the door5
Which Wi-Fi lane?6
Wired cameras and doorbells7
Where the video goes8
Baby monitors9
Keep strangers out10
When the Wi-Fi is cut on purpose11
Five things people get wrong12
Do this now13
Where this comes from15
A word on the wordsThe box means whatever your camera talks to over the air: your router, or the nearest unit of a mesh system. Camera covers security cameras, video doorbells and Wi-Fi baby monitors. They all send video the same way.
Cameras, Doorbells and Baby Monitors, Explained2
The big idea

The camera sends

Your internet line runs two ways. Download is what comes to you. Upload is what you send.

Download: what comes to you movies, web pages, app updates Upload: what you send camera video, video calls, photo backups camera the box the internet
Figure 1. Two directions. A camera's video leaves your home on the upload side. The big download number on your bill says little about it.

Internet plans are sold by their download number. A camera lives on the upload side, and upload is usually much smaller.

Some cameras send all the time. Others send only when something moves. Your camera's help page says which kind you have.

Cameras, Doorbells and Baby Monitors, Explained3
Do the math

How many cameras your line can carry

Cameras add up. Each one takes a slice of your upload.

Your uploadResult1 cameraLots of room3 camerasNearly full3 camerasand a video callno roomCall freezes
Figure 2. Cameras fill the upload. Each camera takes a slice of your upload. Add enough and a video call no longer fits. Not to scale.

One maker's help page says its best-quality camera sends about 3 megabits a second. A typical home upload is only a few times that.

When the upload fills, a video call freezes or a clip arrives late. Some cameras quietly switch to blurrier video instead.

Find your own upload numberOpen the free WLAN Pros Toolbox, tap Network Quality, and read the upload row. Leave room for everything else you send.
Cameras, Doorbells and Baby Monitors, Explained4
Placement

Signal at the door

Your router usually sits at the back of the house. Your doorbell sits outside the front wall.

the box doorbell Box in the back room two inside walls, then the outside wall the box doorbell Box in the front room only the outside wall
Figure 3. Same house, same doorbell. The dashed line is the Wi-Fi path. Moving the box, or adding a unit near the front, takes walls out of the way.

The outside wall is the hardest one for Wi-Fi to cross. Brick, stone and stucco take a lot of the signal. Metal siding is worse.

A camera with one bar sends slowly. It keeps the Wi-Fi busy for everyone else too. Check its signal in the camera's app, with the door shut.

Fixes, gentlest first

  1. Move the box toward the front of the house, up off the floor.
  2. Add a mesh unit or access point inside, near the front wall.
  3. Run a cable to the camera, or to an access point near the door.
Cameras, Doorbells and Baby Monitors, Explained5
The lanes

Which Wi-Fi lane?

Home Wi-Fi runs in separate lanes, called 2.4 GHz and 5 GHz.

the box 2.4 GHz lane: reaches farther, and it's crowded 5 GHz lane: far more room, shorter reach outside wall doorbell
Figure 4. Two lanes to the door. The 2.4 GHz lane reaches farther through walls but is busier. The 5 GHz lane carries more but gives up sooner.
From Keith's book

"The old outer lane is named 2.4. It reaches farther than the others, and it is also the most crowded road in the neighborhood, because every old gadget in every house nearby is crammed into it alongside yours. The middle lane is named 5. It does not reach quite as far, but there is far more room in it, and that room is what you actually feel as speed."

Keith Parsons, Fix Your Own Wi-Fi, chapter 3

Some cameras only use 2.4 GHz. If yours can use either and hangs far from the box, 2.4 GHz often holds better. Close by, 5 GHz gives it more room.

Cameras, Doorbells and Baby Monitors, Explained6
Cables

Wired cameras and doorbells

"Wired" can mean two different things on a camera box.

  • Wired for power. A plug-in camera, or a doorbell on your old doorbell wires. Its video still goes out by Wi-Fi.
  • Wired for video. An Ethernet camera. One network cable can carry both power and video, so there's no radio link at all. Most routers can't send power down the cable, so it may need a small power box.
BatterycamerarouterPowerbatteryVideoWi-Fistill needs Wi-FiWired for powercamerarouterPowera wireVideoWi-Fistill needs Wi-FiWired for videocamerarouterPowerthe cableVideothe cableno radio at all
Figure 5. What the wire carries. Only the one on a network cable sends its video without Wi-Fi. The other two still need a good Wi-Fi signal.

A battery camera is the easiest to mount anywhere. It needs charging, and weak Wi-Fi drains it faster.

Why the cable wins, where you can run oneA cable has no walls to cross and no neighbors in the same lane. An Ethernet camera works the same on the busiest evening as it does in the middle of the night. It's the best choice for the camera that watches your door.

Can't run a cable to the camera? A cable to an access point just inside the front wall does most of the same good.

Cameras, Doorbells and Baby Monitors, Explained7
Recording

Where the video goes

Every camera saves its video somewhere: in the cloud, or in your home.

camera memory card the box home recorder the maker's cloud cloud recording leaves home through your upload local recording stays in the house, on a card or a recorder
Figure 6. Two places to keep video. Many cameras can do both.

Cloud

A thief who takes the camera doesn't take the video already saved. It uses your upload, often needs a monthly plan, and stops saving if the internet drops.

In your home

A memory card or a home recorder keeps saving when the internet is down. But a card inside the camera leaves with the camera.

Cameras, Doorbells and Baby Monitors, Explained8
The nursery

Baby monitors

A baby monitor is a camera with one job and one viewer. There are two kinds.

Direct-radio monitorWi-Fi monitorcameraparent screenStraight from camera to screen.No internet, no app, no account.camera, your Wi-Fi, the internet, your phoneWatch from anywhere.Lock it down like any internet camera.
Figure 7. Two kinds of baby monitor. One talks straight to its own screen. The other goes through your Wi-Fi and the internet to your phone.

If you only need to watch from inside the house, a direct-radio monitor keeps the nursery off the internet. If you want to check in from work, a Wi-Fi monitor needs the same care as a front-door camera.

Stop
Keep the monitor and its cord out of reachBaby monitor cords have strangled children. Keep the monitor and its cord at least 1 m (3 feet) from any part of the crib. Never put a monitor in the crib or on its edge.
Cameras, Doorbells and Baby Monitors, Explained9
Security

Keep strangers out

A camera on the internet needs a lock. Four habits do most of the work.

Its own passwordnever the defaultTwo-step sign-ina code on your phoneUpdates onfixes arrive by themselvesCheck who can watchremove old viewers
Figure 8. Four ways to lock a camera down. Do all four, starting with the password.
  1. Give it its own password. Never keep the one it came with, and don't reuse one from another account.
  2. Turn on two-step sign-in. A code on your phone stops someone who guesses the password.
  3. Keep it updated. Turn on automatic updates in the camera's app.
  4. Check who can watch. Remove anyone who no longer needs to see your cameras.
Cameras, Doorbells and Baby Monitors, Explained10
Resilience

When the Wi-Fi is cut on purpose

A jammer is a gadget that drowns out radio signals nearby. Police have warned about burglars using them to cut wireless cameras off.

Wireless, cloud recording only While the link is down, nothing is saved. Wireless, with a memory card If it's set to record to its card, it keeps recording. Wired, over Ethernet No radio link to interrupt, while it has power.
Figure 9. When the radio link drops. The red X is any break in the Wi-Fi hop: a jammer, a box that's switched off, or plain weak signal.

Three defenses, strongest first

  1. Wire the cameras that matter. A cable has no radio link to drown out.
  2. Record on a memory card too. The camera keeps saving while its Wi-Fi is down.
  3. Turn on offline alerts. The app can tell you when a camera goes quiet.
Caution
Jammers are illegal in the USUsing, selling or importing one is against the law, with fines and even prison. Ordering one online from overseas counts as importing. Don't buy one to test your own cameras.
Cameras, Doorbells and Baby Monitors, Explained11
Straight facts

Five things people get wrong

Each myth is followed by what's true.

1Upload iswhat countsdownloadupload2One baris too weakslow, blurryvideo3The wire isonly powerpowervideo4Its ownpasswordchange the oneit came with5Home recordingworks toocard or recorder,no cloud needed
Figure 10. What's true, in pictures. Each numbered panel goes with the myth of the same number below.
MythA fast internet plan covers my cameras.
FactCameras send. The upload number is the one that counts, and it's usually much smaller.
MythOne bar at the front door is fine.
FactA camera that barely hears the box sends slowly, may blur its own video, and slows the Wi-Fi for everyone.
MythA "wired" doorbell sends its video over the wire.
FactIn most homes the wire only powers it. The video still goes out by Wi-Fi.
MythThe default password is fine on my own network.
FactChange it. The first rule for any camera is its own password.
MythCloud recording is the only option.
FactMemory cards and home recorders keep video in your house.
Cameras, Doorbells and Baby Monitors, Explained12
Appendix

Do this now

Half an hour, one camera at a time. Start with the one at your door.

Check the upload

  1. Look up each camera's upload on its maker's help page, and add them up.
  2. In the free WLAN Pros Toolbox, tap Network Quality and read the upload row. Compare.

Check the signal where it hangs

  1. Open the camera's app and find its signal reading, with the door shut.
  2. If it's weak, work through the fixes on page 5.

Lock it down

  1. Its own password, two-step sign-in and automatic updates on every camera.
  2. Baby monitor and cord at least 1 m (3 feet) from the crib.
Cameras, Doorbells and Baby Monitors, Explained13
Appendix

Do this now, continued

1Unplug the boxno internet for now2Walk past itgive it motion to record3Plug in, lookclip on card or recorder?A clip is thereIt records at home, even withthe internet down.No clipIt saves onlyto the cloud.
Figure 11. The unplug test. Take the internet away, give the camera something to record, then look on its card or home recorder. A clip there means it records at home.

Test recording without the internet

  1. When nobody needs the internet, unplug the internet line from the box for five minutes, and walk past the camera.
  2. Plug it back in. If the clip isn't on the memory card or your home recorder, the camera saves only to the cloud.
Cameras, Doorbells and Baby Monitors, Explained14
Sources

Where this comes from

Checked in September 2026. Rules, plans and products change, so check the ones you rely on.

  • FCC, "Jammer Enforcement," updated September 2026: fcc.gov/general/jammer-enforcement
  • FTC Consumer Advice, "How To Secure Your Home Security Cameras," February 2023: consumer.ftc.gov/articles/how-secure-your-home-security-cameras
  • FTC Consumer Advice, "Securing Your Internet-Connected Devices at Home," August 2022: consumer.ftc.gov/articles/securing-your-internet-connected-devices-home
  • Google Nest Help, "Learn about internet bandwidth & speed requirements for Nest cameras": support.google.com/googlenest/answer/9245832
  • US Consumer Product Safety Commission, OnSafety, "Baby Monitor Cords: 3 Feet from Baby," 11 July 2012: onsafety.cpsc.gov
  • Police warnings, as reported: PCWorld, "Burglars are jamming Wi-Fi security cameras," 12 November 2024 (LAPD Wilshire Division, 2024); NBC Los Angeles, 17 March 2025 (LAPD Chief Jim McDonnell)
  • Keith Parsons, Fix Your Own Wi-Fi (WLAN Pros, in preparation, 2026), chapter 3
About this guideWritten for people who aren't technical and want their cameras to work when it matters. The figures come from one maker's help page because it publishes per-camera upload numbers; they're one maker's numbers, not a rating, and no maker had a part in this guide. The guide is independent and isn't affiliated with any camera maker, provider or carrier.
About the authorKeith Parsons, CWNE #3, has designed, installed and troubleshot Wi-Fi for over 25 years. He runs Wireless LAN Professionals and the WLPC conferences.
Cameras, Doorbells and Baby Monitors, Explained · Keith Parsons · CWNE #315