Which technology provides power and data connection through a single cable in CCTV systems?

The technology that provides both power and data connection through a single cable in CCTV systems is Power over Ethernet, commonly referred to as PoE. This technology utilizes Ethernet cables to deliver electricity along with network connectivity to devices such as IP cameras. By combining both functionalities into one cable, PoE simplifies installation and reduces the amount of wiring required, making it particularly beneficial in scenarios where running multiple cables would be impractical or costly.

PoE works by allowing power to be delivered over the standard Ethernet cabling that is typically used for data transmission. This means a CCTV installer can use a single cable to not only connect the cameras to the network but also to power them, streamlining the installation process and enhancing flexibility in where cameras can be placed.

While HDMI is primarily used for high-definition audio and video transmission and does not carry power, coaxial cables are generally used for analog signals and do not support data and power together either. Ethernet cables can provide data connection but without PoE, additional power cabling would be necessary. Thus, PoE is the best choice for providing both power and data in modern CCTV systems.