Why CCTV needs the right PoE switch
Power over Ethernet (PoE) lets a single network cable carry both data and power to an IP camera — no separate power supply at each camera location. That makes the PoE switch the heart of any modern CCTV install. Choose the wrong one and you get cameras that reboot, drop off at night when IR turns on, or a switch that runs out of power halfway through the project. Choose the right one and the system just works.
PoE, PoE+ and PoE++ explained
- PoE (802.3af): up to 15.4 W per port (about 12.95 W usable). Fine for most fixed bullet and dome cameras.
- PoE+ (802.3at): up to 30 W per port. Needed for PTZ cameras, cameras with heaters, and higher-power IR.
- PoE++ (802.3bt): up to 60–90 W per port. For specialised loads; rarely needed for standard CCTV.
Match the standard to your cameras' peak draw — remember that IR illumination and PTZ motors increase power consumption at night and during movement.
How to size your PoE power budget
Every PoE switch has a total PoE power budget (e.g. 130 W) shared across all ports. To size it:
- List every camera and its peak wattage (check the datasheet — use the peak, not idle, figure).
- Add them up.
- Add 20–30% headroom for cable loss and future cameras.
- Pick a switch whose total budget comfortably exceeds that number.
Example: 8 cameras at 7 W peak = 56 W; add 30% headroom = ~73 W; a 120–130 W switch is a safe, future-proof choice.
Choosing the right port count
Count your cameras and add at least one uplink port to the recorder/network. Common configurations are 4, 8, 16 and 24-port PoE switches. Leave a couple of spare ports for growth — CCTV systems almost always expand.
Unmanaged vs managed for CCTV
For a straightforward camera-to-recorder setup, an unmanaged PoE switch is ideal: plug-and-play, no configuration, lower cost, and reliable. Choose a managed switch when you need VLANs to isolate CCTV traffic, QoS, remote monitoring, or you are integrating cameras into a larger enterprise network. For most installers, unmanaged covers the majority of jobs, with managed reserved for larger or security-sensitive sites.
Quick buyer's checklist
- Enough total PoE budget (with 20–30% headroom)?
- Right PoE standard (af/at) for your cameras?
- Enough ports + uplink + room to grow?
- Gigabit ports for high-resolution cameras?
- Fanless/rugged enough for a DVR cabinet?
- Local warranty, support and stock?
Immunity Networks is bringing a Make-in-India range of unmanaged PoE switches built for exactly these CCTV requirements — register your interest for dealer pricing and early access.
Frequently asked questions
How many watts of PoE do IP cameras need?
Most fixed IP cameras draw 4–7 W (PoE); PTZ, heated or high-IR cameras can draw 15–30 W (PoE+). Always size to peak, not idle.
Do I need managed or unmanaged for CCTV?
Unmanaged is ideal for standard camera-to-recorder setups; choose managed when you need VLANs, QoS or enterprise integration.
How many cameras can an 8-port PoE switch run?
Up to 7 cameras plus an uplink — provided the total PoE budget covers their combined peak wattage with headroom.