Connector

T hese three connectors—RJ45, BNC, and DC—are staple components in networking, surveillance, and electronics, primarily used for connecting cables to devices for data, video, or power transmission.

RJ45 (Registered Jack 45) :

• An 8-pin (8P8C) modular connector, often called an Ethernet connector, used to terminate twisted-pair networking cables (Cat5e, Cat6).
• Connects computers, routers, switches, smart TVs, and IP cameras to a Local Area Network (LAN).
• It uses a locking tab for a secure, click-in connection. It supports high-speed data transfer and Power over Ethernet (PoE), allowing it to carry both data and electrical power to devices.

BNC (Bayonet Neill-Concelman) :

• A type of coaxial cable connector featuring a "bayonet" (twist-and-lock) coupling mechanism, named after its inventors, Paul Neill and Carl Concelman.
• Commonly used for professional video (SDI, CCTV cameras), radio frequency (RF) equipment, and in some older, specialized networking applications.
• It provides a very secure, low-signal-loss connection, usually for 75-ohm (video) or 50-ohm (RF) systems.

DC (Direct Current) Connector/Jack :

• A specialized plug or socket used to supply low-voltage direct current power to electronic devices.
• The most common form is the DC Barrel Jack, often used to power CCTV cameras, laptops, routers, and small electronics.
• They generally have two conductors (positive and negative/ground). In surveillance systems, a "DC Male/Female" connector often accompanies a BNC connector to provide 12V or 24V power to the camera.