SmartRTSPQuick answer
A camera PoE switch must provide the camera’s required power standard on each port and enough total PoE budget for all connected devices. Add margin for cable losses, night IR, heaters and PTZ use. An ordinary Ethernet switch provides data only unless it explicitly supports the required PoE output.
Match the standard on every camera port
Read the camera datasheet and switch specification together. IEEE 802.3af, 802.3at and 802.3bt describe different PoE capabilities; a switch advertising PoE does not automatically satisfy a high-power PTZ camera. Check the supported type or class, per-port limit and the ports that actually supply power.
Use standards-based equipment matched to the camera. Passive PoE products can use fixed voltage and wiring arrangements rather than the negotiation expected by a standards-based device, so do not connect them merely because both connectors are Ethernet. If a camera uses a separate supply, verify that supply against its manual instead. A data link and compatible power are two distinct requirements.
Calculate the whole switch budget
The per-port rating and the switch’s total PoE budget are different limits. Four ports advertised at 30 W each do not imply the switch can supply 120 W simultaneously. Count every powered device, including access points, and check the budget for the exact switch hardware revision and power supply.
For example, four cameras specified at 12 W maximum require 48 W at the cameras before accounting for the switch’s allocation method and cable losses. A 40 W total budget is insufficient even if each port individually supports them. Choose additional headroom for your installation rather than treating the arithmetic minimum as a reliable night-time design.
Steps
- List each camera’s required PoE standard and maximum consumption from its datasheet.
- Confirm each planned switch port can support that camera individually.
- Add the maximum requirements and follow the switch vendor’s allocation and cable-loss guidance, leaving capacity for expected additions.
- Test with IR illumination, heaters and PTZ functions active where available, then inspect power status and any restart events.
Check cabling, uplinks and night operation
Typical daytime consumption can exclude IR illumination or heaters. Cameras that work in daylight but restart at night deserve a power-budget and cable check before you change viewer settings. Use suitable copper Ethernet cabling, sound connectors and the installation distances and environmental protection specified by the equipment vendors.
Also size the uplink for simultaneous camera traffic and keep intended network paths reachable. Managed switch features can help inspect power and port state, but network isolation still needs an access plan for the viewer. Once power and addressing are stable, verify the configured streams in SmartRTSP. A successful PoE negotiation is useful installation evidence; it does not confirm codec compatibility, account permissions or the correct RTSP path.
Frequently asked questions
Can an ordinary Ethernet switch power a camera?
Only if it explicitly supplies compatible PoE on the connected port. Otherwise the camera needs an appropriate injector or its specified separate power supply.
Why does a camera restart when IR turns on?
IR may increase power demand. Check the camera maximum, per-port capability, shared budget and cable condition, while also checking the manufacturer’s diagnostics.
Does a bigger total budget fix an incompatible port?
No. Each port must support the camera’s required standard and power level, even when unused total capacity remains.