Coaxial CCTV Cable: Selection and Compatibility

Coaxial CCTV cable carries video between compatible cameras, recorders, and transmission equipment. Its performance depends on the complete cable assembly—not just an RG designation. Check the video format, impedance, attenuation, connectors, and installation environment before selecting or reusing cable.

How coaxial cable is constructed

A central conductor carries the signal. Dielectric insulation separates it from an outer conductive shield, and the jacket protects the assembly. Conductor material, shield construction, and dielectric properties affect electrical performance. Use the manufacturer’s specifications rather than judging quality by jacket thickness alone.

Match the impedance and connectors

Common CCTV video connections use 75-ohm coaxial systems. Match the camera and recorder specifications, including the cable and connectors. A BNC connector describes a connection style; it does not by itself establish the correct impedance, cable fit, or video-format support.

RG59, RG6, and RG11

These names identify cable families, not guaranteed transmission distances. Individual products differ in conductor construction, attenuation, shielding, and environmental ratings. Larger cable can be harder to route and terminate. Compare actual datasheets and the equipment’s tested cable recommendations.

Do not apply a distance table for older composite video to every HD-over-coax or SDI system. Resolution, frame rate, signal format, intermediate devices, and receiver capabilities affect the permitted link.

Power needs a separate compatibility check

With Siamese cable, separate conductors provide camera power alongside coaxial video. Size that circuit for the specified voltage and maximum current, allowing for voltage drop. With Power over Coax, both the source and camera must support the selected PoC system. A usable video path is not proof of a suitable power path.

Route and environmental conditions

Select a jacket rated for the intended location and follow applicable installation requirements. Indoor cable is not automatically suitable for wet conduit, sunlight, or direct burial. For moving equipment, use cable and routing approved for the required flexing; a stranded conductor alone is not a guarantee of continuous-flex suitability.

Inspect an existing run before an upgrade

  • Identify the cable and total route length.
  • Check joints, connectors, splitters, converters, and surge devices.
  • Inspect for moisture, crushing, sharp bends, and damaged jackets.
  • Confirm support for the new camera’s video mode and power method.
  • Test live video, recorded playback, and any supported audio or control functions.
  • Repeat testing under expected night-mode power demand.

When another medium makes sense

If a route exceeds the supported coaxial link or cannot meet the project requirements, assess a compatible transmission solution or an IP network design. Any converter introduces its own format, power, distance, and maintenance requirements.

Compare security cable types, review HD-CVI compatibility, or explore the CCTV FAQ.