Power over Coax for CCTV Cameras

Power over Coax, or PoC, supplies electrical power and carries video over a compatible coaxial connection. In a supported system, this can avoid a separate power cable to each camera. It is not a feature of every analog camera, DVR, or coaxial installation.

Both ends must support PoC

Check the exact camera and recorder or power-unit models. A PoC-capable recorder does not make an ordinary camera accept power through its video connector. Verify the manufacturer’s compatibility list, supported video format, power requirements, and installation instructions before connecting equipment.

PoC and PoE are different

PoC uses a supported coaxial system. Power over Ethernet supplies compatible network devices through Ethernet cabling. The terms do not identify interchangeable connectors, adapters, or power sources. Ethernet-over-coax equipment is another category and requires its own compatibility checks.

What determines the supported distance?

Maximum distance depends on the specific equipment, cable construction, cable condition, connectors, video mode, and power demand. A distance stated for one manufacturer’s tested combination is not a universal PoC limit. Use the approved cable and distance table for the selected camera and power source, including any restrictions on intermediate devices.

Test the camera under its highest expected load, including infrared lighting, heaters, and motorized functions where fitted. An image during a short daytime test does not establish reliable night operation.

Can existing coax be reused?

Possibly, after inspection and compatibility testing. Identify the complete cable route and any joints, surge devices, splitters, or converters. Equipment that passes video may not pass PoC power safely or correctly. Do not apply an improvised power supply to a video cable.

Installation checklist

• Record the camera, DVR, and PoC power-unit model numbers.
• Confirm that the manufacturer supports the complete combination.
• Check cable type, route length, terminations, and environmental rating.
• Follow the specified connection sequence and safety instructions.
• Test recording and camera operation under expected day and night loads.
• Document the cable route and include the power source in outage planning.

Benefits without blanket promises

PoC may simplify cabling where compatible equipment and suitable coax are available. It does not guarantee a fixed percentage of savings, unlimited compatibility, or immunity to cable faults. Compare the complete installed system and maintenance needs before choosing between PoC, separate camera power, and IP cameras with PoE.

Learn about coaxial CCTV cable, HD-CVI compatibility, and the CCTV FAQ.