PoE stands for Power over Ethernet. It sends both electricity and data to a camera over a single network cable, so you do not need a separate power outlet at every camera. A PoE switch is the box that supplies that power and connects the cameras to the recorder. Most professional camera systems use PoE because it is reliable, clean and easy to expand. For buyers, the questions that matter are simple: how many ports, how much power, how far can the cables run and what happens when the power goes out. This guide answers them without jargon.
This is general information. Specifications vary by product, so ask your installer to confirm numbers for your system.
1. The Short Version
| Question | Short answer |
|---|---|
| What does PoE do? | Powers a camera and carries its video over one cable. |
| What is a PoE switch? | A network switch that provides PoE to several cameras. |
| How far can a cable run? | About 100 meters (328 feet) for standard Ethernet. |
| How many ports do I need? | One per camera, plus spares for growth. |
| How much power? | Add up camera wattage and leave margin. |
| Do I need a backup? | A small UPS keeps cameras recording during short outages. |
2. Why Installers Like PoE
One cable per camera. Fewer cables mean cleaner installs and fewer failure points.
No outlets at the camera. You can mount cameras on exterior walls, eaves and poles without nearby power.
Central power. One switch, one place to protect with a backup.
Reliability. Wired connections do not depend on Wi-Fi signal.
Safety. The voltage is low, which makes installation simpler than running mains power.
Expandability. Add a camera by running a cable to an open port.
3. How PoE Works in Plain Terms
The switch detects whether a connected device supports PoE and, if so, sends a safe amount of power. Standards define how much. Common ones are PoE (up to about 15 watts at the switch port), PoE+ (up to about 30 watts) and PoE++ (up to about 60 to 90 watts). Most fixed cameras use 5 to 15 watts. PTZ cameras with heaters or motors can use 25 to 60 watts. Cameras with built-in floodlights or heaters may use more.
4. Choosing a Switch: The Basics
Number of ports. One for each camera, plus one for the recorder (unless the recorder has built-in PoE ports) and spares for growth. A four-camera home might use a 5- or 8-port switch. A sixteen-camera business might use a 24-port switch.
PoE budget. The total watts the switch can supply across all ports. Add up camera wattages and leave 20 to 30 percent margin. A switch with eight PoE ports might supply only 60 to 120 watts total, not enough for eight power-hungry cameras. Check the budget, not just the port count.
Port speed. Gigabit ports are standard and recommended for higher-resolution cameras. Fast Ethernet may be enough for small systems but limits growth.
Uplink. If the switch connects to another switch or a recorder, make sure the uplink has the speed you need.
Managed vs. unmanaged. Unmanaged switches are plug-and-play. Managed switches let you monitor, segment networks and control features. Businesses often benefit from managed switches. See our guide on camera cybersecurity.
Mounting and cooling. Switches get warm. Put them in ventilated spaces.
5. PoE Switch vs. PoE Injector vs. Recorder With Built-in Ports
PoE switch. Best for several cameras. Provides data and power centrally.
PoE injector. A small adapter that adds power to one cable. Useful for a single camera far from the switch.
NVR with built-in PoE ports. Many recorders include PoE ports for a handful of cameras. Convenient for small systems, but the ports may be limited. Adding an external switch lets you expand.
Midspan or extender. Used to extend runs beyond 100 meters. Ask your installer whether it is needed.
6. Cable Length and Quality
Standard Ethernet cable runs up to about 100 meters, roughly 328 feet. Long runs for driveways, outbuildings or large lots may need extenders, fiber or an additional switch. Cable quality matters. Use solid copper cable rated for the environment (outdoor-rated for exterior runs). Cheap copper-clad aluminum cable can cause voltage drop, overheating and failures. Ask what cable the installer uses. Our guide on wiring through brick and plaster covers routing in older buildings.
7. Power Outages and Backup
When the power goes out, a PoE switch stops powering cameras unless it has a backup. A small uninterruptible power supply (UPS) keeps the switch, recorder and router running for a time. Size the UPS for the total load and desired runtime. Some owners want 15 to 30 minutes; others want longer for businesses. A UPS also protects against surges and brownouts. Remember that the internet router also needs backup if you want remote viewing during outages.
8. Network Segmentation and Security
Cameras and recorders should not sit on the same open network as your computers and point-of-sale systems. A managed switch can place cameras on a separate network or VLAN. Change default passwords on every device, update firmware and avoid exposing the system directly to the internet. See guidance from the Cybersecurity and Infrastructure Security Agency at cisa.gov and our guide on camera hacking.
9. Mistakes to Avoid
Counting ports but ignoring the PoE budget. A switch can run out of power before it runs out of ports.
Using consumer switches with no PoE budget details. Check the specifications.
Overloading with PTZ or heated cameras. They draw more.
Cheap cable. It causes mysterious problems.
No spare ports. You will want to add a camera.
No backup power. Footage stops when the lights go out.
Putting the switch in a hot closet. Heat shortens life.
Plugging in random devices. Keep the camera network clean.
10. News Context
A reliable power and network design matters because cameras must be recording when something happens. In August 2026, ABC7 New York reported that thieves broke into several Bay Ridge restaurants overnight, and surveillance cameras captured a hooded figure with a flashlight in a basement. In September 2026, News 12 reported that NYPD sought two suspects in 19 commercial burglaries across 16 Brooklyn neighborhoods. Incidents often happen at night and during power or internet issues. A switch, recorder and router on backup power help the system keep recording.
NYPD reported burglary down 19.5% citywide in May 2026 compared with May 2025 (NYPD).
11. Costs
Planning ranges in 2026 for equipment (before labor):
| Item | Typical price range |
|---|---|
| 5- to 8-port PoE switch | $60 to $250 |
| 16-port PoE switch | $200 to $600 |
| 24-port managed PoE switch | $400 to $1,200 |
| PoE injector | $15 to $60 |
| UPS for switch and recorder | $120 to $450 |
| Outdoor-rated Cat6 cable, per run | Varies with length and routing |
Installed camera systems: four cameras $1,600 to $3,600; eight cameras $3,000 to $6,800; sixteen cameras $6,500 to $13,000. These are planning ranges, not quotes.
12. Questions to Ask Your Installer
- How many PoE ports and what total PoE budget will my system have?
- Is there room to add cameras later?
- What cable will you use, and how long are the runs?
- Will I have battery backup, and for how long?
- Is the switch managed, and will you segment the cameras?
- Where will the switch and recorder be placed?
See our local pages for commercial camera installation in Manhattan, home camera installation in Queens, security camera installation in Hoboken and our services page.
Not sure whether your cameras are powered properly? Revolvis will walk the property with you and mark the spots.
13. A Sample Spec for an Eight-Camera Business
Eight 4 MP fixed cameras at about 8 watts each total 64 watts. Add a PTZ at 30 watts and the total is 94 watts. With 25 percent margin, aim for a PoE budget of at least 120 watts. A 16-port gigabit PoE switch with a 150-watt budget fits and leaves ports for growth. The switch, recorder and router connect to a UPS sized for about 30 minutes. Cameras connect with solid copper outdoor-rated Cat6 cable, none longer than 90 meters. The camera network is segmented from the office network on a managed switch. Estimated equipment cost for the switch and UPS: $450 to $900.
14. A Simple Way to Think About It
A PoE switch is the heart of a wired camera system. Choose one with enough ports and power, install good cable, protect it with backup power and keep the camera network separate and secure. If the installer can explain those four points in plain language, you are probably in good hands.
More From Revolvis
Cameras are one layer of a secure property. The same in-house crew also handles the rest:
- Keyless entry installation and smart lock installation
- Access control systems and commercial access control
- Video doorbells and intercoms
- Alarm system installation
- Complete unified security
Learn more about Revolvis, meet the team, see all services, browse the blog or contact us.
Areas We Serve
Revolvis installs residential and commercial camera systems across the New York metro area. Every borough and county has its own building stock, rules and wiring challenges, so the plan for a Queens two-family is not the plan for a Manhattan co-op.
- Staten Island: houses, detached garages and shop fronts. See security camera installation in Staten Island.
- Brooklyn: brownstones, row houses and storefronts. See security camera installation in Brooklyn.
- Queens: attached brick homes, two-families and busy commercial strips. See security camera installation in Queens.
- The Bronx: pre-war buildings, bodegas and warehouses. See security camera installation in the Bronx.
- Manhattan: co-ops, condos, offices and retail. See security camera installation in Manhattan.
- Long Island: Nassau County and Suffolk County.
- New Jersey: Jersey City, Newark, Hoboken and nearby towns.
The full list is on the service areas page.
Get a Custom Quote After a Site Visit
Revolvis prices every job after a site visit, because the building sets the cost as much as the equipment does. A few things make the estimate faster and more accurate:
- The address and property type: house, apartment, co-op, condo, storefront or warehouse.
- Which doors, sides and areas you want covered, and what worries you most.
- Photos of those spots and any spots where you already have cabling or power.
- How many days of footage you want to keep and whether you want to watch on your phone.
- Any landlord, board, lender or insurer requirement.
Call 347-258-9165 or use the contact page to book a site visit. The quote you receive is written and itemized, so you can compare it line by line.
Frequently Asked Questions
What is a PoE switch? A network switch that powers cameras and carries their video over the same Ethernet cable.
How many PoE ports do I need? One per camera plus spares and a port for the recorder if needed.
How far can a PoE camera be from the switch? About 100 meters, or 328 feet, with standard Ethernet cable. Extenders can go farther.
What is a PoE budget? The total watts a switch can supply across all ports. Check that it exceeds your cameras' combined needs.
Do I need a UPS? It is recommended so cameras keep recording during short outages.
Can I use Wi-Fi cameras instead? Yes, but wired PoE is generally more reliable for businesses and critical coverage.
Ready for a custom quote? Call Revolvis at 347-258-9165 for a site visit and a written, itemized estimate.
Safety note: A camera system supports, but does not replace, good locks, lighting, alarms and everyday habits. If you are in danger or witnessing a crime, call 911. Prices and legal summaries in this guide are general information for the New York metro area, not an offer or legal advice. A written quote after a site visit governs your actual price, and for legal questions you should confirm with the agencies linked in the article or a licensed attorney.