What Is a BNC Cable? Everything You Need to Know

If you’re dealing with video surveillance, broadcast systems, or radio-frequency applications, you may have come across the term BNC cable. But what exactly is it, and how is it used?

what is bnc cable

In this article, we’ll explain what a BNC cable is, its components, common applications, and how it compares to other types of coaxial cables.

What Is a BNC Cable?

A BNC cable is a type of coaxial cable that uses a Bayonet Neill–Concelman (BNC) connector. The BNC connector is a quick-connect/disconnect RF connector that provides a secure, twist-lock mechanism. It is most commonly used for:

• Analog video transmission

• Radio frequency (RF) signals

• Test equipment

• CCTV security camera systems

Components of a BNC Cable

A typical BNC cable includes:

• Center conductor – Carries the signal

• Dielectric insulator – Maintains spacing and supports impedance control

• Shielding – Blocks electromagnetic interference (EMI)

• Outer jacket – Protects the cable

• BNC connector – A twist-lock connector designed for secure, easy attachment

BNC connectors typically support 50 ohm or 75 ohm impedance, depending on the application.

Common Uses of BNC Cables

✅ CCTV and Security Systems

BNC cables are widely used in analog and HD security cameras (e.g., AHD, HD-TVI, HD-CVI).

✅ Broadcast and Video Equipment

They are used to connect professional video equipment such as monitors, mixers, and recorders.

✅ Test and Measurement Devices

Oscilloscopes and signal generators use BNC cables for reliable high-frequency connections.

✅ Ham Radio and RF Communication

They’re popular in RF systems for antennas and signal transmission.

BNC Cable vs. Other Coaxial Cables

Types of BNC Cables

• 75 Ohm BNC Cable – Used for video and broadcast (e.g., RG59 or RG6)

• 50 Ohm BNC Cable – Used for RF and data transmission (e.g., RG58)

• HD BNC (Mini BNC) – Smaller version used in HD video applications

Are BNC Cables Still Relevant?

Yes! While digital video (like HDMI and IP cameras) is common today, BNC cables are still widely used, especially in:

• Existing CCTV systems

• Specialized RF and lab environments

• Low-latency or interference-sensitive applications

They offer secure connections, high reliability, and low signal loss, making them a trusted standard in many professional fields.

Conclusion

So, what is a BNC cable?
It’s a coaxial cable equipped with a BNC connector—used to transmit analog video, RF signals, or test signals in applications like CCTV, broadcasting, and lab equipment.

Whether you're installing a security system or connecting lab instruments, BNC cables offer secure, high-quality signal transmission in compact, easy-to-use form.

Need Help Choosing the Right BNC Cable?

We offer a wide selection of BNC cables in various lengths, impedances, and grades for professional and home use. Contact us today for guidance on the best cable for your system.