Know About Coaxial Cables: Are They Still Being Used?

Remember those thick cables running behind your TV? The ones that connected everything from your cable box to your rooftop antenna? Those are coaxial cables, and despite what you might assume, they are far from gone.

With fiber optics and Wi-Fi dominating the conversation today, a fair question comes up: Is coaxial cable still used today? The short answer is yes, and more widely than most people realize. According to the National Cable & Telecommunications Association (NCTA), over 85 million U.S. households still rely on coaxial-based networks for internet and television access as of 2024. Providers like Comcast Xfinity, Charter Spectrum, and Cox Communications together serve over 60 million residential customers, all on coaxial-based infrastructure.

So before you write off coax as old technology, let's break down exactly what it is, how it works, and why coaxial cables are still used.

What Is a Coaxial Cable?

A coaxial cable, commonly called a coax cable, is a type of electrical cable designed to transmit radio frequency (RF) signals with minimal interference and signal loss. It gets its name from its structure: all its layers share the same geometric axis, which is where "coaxial" comes from.

In simple terms, a coaxial cable carries electrical signals from one device to another, whether that's your cable modem, TV, satellite dish, or security camera, while the surrounding layers protect that signal from outside interference.

How Does a Coaxial Cable Work?

A coaxial cable transmits data in the form of electromagnetic waves that travel between its inner and outer conductors. The inner conductor carries the signal, while the metallic shield surrounding it acts as both a return path and a barrier against electromagnetic interference (EMI).

This layered design is what makes coax reliable. The signal stays contained within the cable, so it reaches its destination with far less degradation than a basic wire. That's why coaxial cable handles high-frequency signals efficiently, even over longer distances.

How Is a Coaxial Cable Built?

Understanding the structure helps you appreciate why coax performs the way it does. A standard coaxial cable has four main layers:

Inner conductor: Usually made of solid copper or copper-clad steel, this core carries the actual signal.

Dielectric insulator: A non-conductive layer that surrounds the inner conductor and maintains the correct spacing between it and the shield. This spacing directly affects the cable's impedance.

Metallic shield: This is the key protective layer. It comes in two forms:

● Foil shielding: A thin aluminum foil layer that provides 100% coverage around the cable.

● Braid shielding: Woven bare or tinned copper wires that can cover up to 95% of the cable and are easier to terminate in the field.

Outer jacket: The final protective sheath that guards the cable against physical damage, moisture, and environmental wear.

The shield serves four purposes: it keeps the signal inside the cable, blocks unwanted interference from entering, provides a uniform inner surface, and reduces crosstalk with nearby wiring.

Types of Coaxial Cables: Are There Different Coax Cables?

Yes, there are different coax cables, and each is designed for specific use cases. Using the wrong type can result in signal degradation or compatibility issues. Here are the most common ones:

● RG6: The most widely used coaxial cable for residential applications. RG6 dominates the North American market, capturing 38.3% of market share in 2024. It supports frequencies up to 1.5 GHz, making it the go-to choice for cable TV, satellite TV, and DOCSIS 3.1-based gigabit internet services.

● RG11: Thicker and lower in signal loss than RG6, making it ideal for long-distance runs of 100 feet or more. It's commonly used for outdoor installations and as a backbone cable in larger setups where RG6 would lose too much signal.

● RG59: A thinner, more flexible cable suited for shorter runs. It works well for CCTV systems, in-building video distribution, and connecting devices such as DVRs in a limited space.

● Triaxial cable: Features an extra inner shield on top of the standard design, offering superior protection against interference. It's used in broadcast environments and professional video applications.

● Semi-rigid cable: Built with a solid outer conductor rather than a braid, it provides excellent shielding but can't be bent easily. You'll find it in industrial, aerospace, and high-frequency RF applications.

If your project requires durable, reliable cabling, take a look at the coaxial cable available at Discounted Cables and choose the option that best fits your needs.

Coax Cable Connector Types

Connectors are just as important as the cable itself. A poor-quality or mismatched connector can cause signal loss and compatibility issues. Here are the different types of coax connectors:

● F-connector: The standard threaded connector used for cable TV, satellite, and cable internet. It's the one you'll find on the back of your TV and cable modem.

● BNC connector: A twist-lock connector widely used in CCTV systems, broadcast video equipment, and test instruments. It provides a secure, reliable connection.

● N-connector: A weatherproof, threaded connector used in outdoor and high-frequency applications such as cellular antennas and Wi-Fi access points.

● TNC connector: Similar to the N-connector but with a threaded coupling instead of a bayonet lock. It performs better at higher frequencies and is used in mobile and military communications.

Always match your connector type to your cable's impedance: 75 ohm for video and TV applications, and 50 ohm for data and wireless communications. Mismatching these can noticeably degrade your signal quality.

What Are Coax Cables Used For?

Coaxial cable is used across more industries than most people realize. Beyond connecting your TV, coax handles critical infrastructure behind the scenes.

Cable and Satellite Television (CATV)

Coaxial cable is still the standard medium for delivering cable TV signals to millions of homes. Its ability to carry high-frequency signals over long distances with minimal signal loss makes it ideal for high-definition and 4K video content.

Broadband Internet

Cable internet providers use what's called a Hybrid Fiber-Coaxial (HFC) network. In this setup, fiber runs from the provider's main facility to a neighborhood node, and coaxial cable handles the "last-mile" connection from that node to your home. This is how Comcast Xfinity, Charter Spectrum, and Cox deliver internet service to tens of millions of customers.

CCTV and Security Camera Systems

RG59 and RG6 cables are heavily used in surveillance systems. They carry high-quality video feeds over long distances, making them a reliable choice for both indoor and outdoor security setups.

Telecommunications and Telephone Networks

Telephone trunk lines have historically relied on coaxial cables for long-distance signal transmission. Many legacy telecom networks still use coax as part of their backbone.

Satellite Dishes and TV Antennas

The coaxial cable connecting your satellite dish to your receiver is almost always RG6. It handles the high-frequency microwave signals that come off the dish without significant signal degradation.

Aerospace and Defense

Coaxial cable is used extensively in radar systems, military communications, and aircraft. In these environments, signal reliability and shielding against interference are non-negotiable.

Can You Use Coaxial Cable for the Internet?

Yes, and hundreds of millions of people already do. Cable internet runs on coaxial cable using DOCSIS (Data Over Cable Service Interface Specification), a set of standards that defines how high-speed data travels over existing coax infrastructure.

Here's how the DOCSIS landscape looks today:

● DOCSIS 3.0 supports download speeds up to 1 Gbps, which is what most cable internet customers currently use.

● DOCSIS 3.1 supports download speeds up to 10 Gbps and is already deployed by major providers, including Comcast and Charter.

● DOCSIS 4.0 is the newest standard and began rolling out in select cities like Atlanta and Philadelphia in late 2024. It's designed to future-proof coaxial infrastructure well into the next decade.

So the idea that coax internet tops out at 100 Mbps is outdated. Over coaxial cable using DOCSIS 3.1, you can receive gigabit internet speeds, and DOCSIS 4.0 pushes that ceiling even further.

Coaxial Cable vs. Fiber Optic Cable: Which Is Better?

The most common question people ask is “Is coaxial cable better than fiber?”, and the honest answer depends on your situation. Here's a clear difference between coaxial and fiber optic cable:

Fiber optic cable transmits data as pulses of light, which means it experiences virtually no signal attenuation and can support symmetrical upload and download speeds. Coaxial cable, on the other hand, uses electrical signals, which means speed and signal quality can degrade over longer cable runs.

That said, fiber isn't available everywhere, and where coax already exists, upgrading to DOCSIS 3.1 or 4.0 delivers gigabit speeds without requiring a full infrastructure overhaul. That's a significant cost advantage for providers and ultimately for consumers.

Advantages of Coaxial Cable

● Strong shielding against electromagnetic interference (EMI): The metallic shield makes coax far more resistant to interference than standard twisted-pair wire.

● Long-distance signal transmission: Coax can carry high-frequency signals over hundreds of feet without requiring amplification in most residential applications.

● Cost-effective and widely available: Coaxial cable is relatively inexpensive to manufacture and easy to install, and it's already present in millions of buildings.

● High bandwidth capacity: RG6 supports frequencies up to 1.5 GHz, enabling simultaneous HD and 4K video, broadband internet, and data services.

● Proven durability: Properly installed indoor coaxial cable can last 10-20 years, making it a dependable medium for long-term infrastructure.

What Are the Disadvantages of Coaxial Cable

No technology is without trade-offs. Coaxial cable has real limitations worth understanding:

● Signal attenuation over long distances: The longer the cable run, the more signal loss you experience. This is especially noticeable at high frequencies. Keeping cable runs as short as necessary helps minimize this.

● Asymmetric speeds: Cable internet over coax delivers much faster download speeds than upload speeds. For most home users, this is fine, but it's a limitation for businesses with high upload demands.

● Susceptibility to moisture and physical damage: Outdoor coaxial cable is vulnerable to water ingress and corrosion over time, especially in humid or coastal environments. Quality outdoor-rated jackets help, but maintenance is still required.

● Stiffer and bulkier than alternatives: Coax is harder to route through tight spaces compared to Ethernet cables, and bending can damage the shield and degrade signal quality.

● Shared bandwidth in cable networks: Unlike fiber, cable internet delivered over coax is often a shared connection in a neighborhood. During peak hours, speeds can dip as more users are online simultaneously.

How Long Do Coaxial Cables Last?

Under normal indoor conditions, a quality coaxial cable can last 10–20 years. For outdoor installations exposed to UV, moisture, and temperature fluctuations, expect a lifespan closer to 10-15 years before performance starts to degrade noticeably.

The connector is often the first point of failure rather than the cable itself. Poorly crimped or corroded connectors can cause signal loss well before the cable itself reaches the end of life. Regular inspection of connectors, particularly for outdoor runs, extends the overall system lifespan.

Is Coaxial Cable Obsolete?

Not by a long shot. Coaxial cable is a legacy technology in the sense that it's been around for decades, but "legacy" doesn't mean "outdated." Fiber optic networks are absolutely the future of high-speed internet, and they outperform coax in almost every technical metric. But fiber-to-the-home infrastructure is expensive to build and still unavailable in vast portions of the country and the world.

In the meantime, coaxial cable, upgraded with DOCSIS 3.1 and now DOCSIS 4.0, continues to deliver gigabit internet to tens of millions of homes. HFC networks are actively being invested in and improved. And in applications such as satellite TV, CCTV, and aerospace communications, coax remains the preferred choice, with no near-term replacement in sight.

For anyone building or upgrading a network today, the right choice depends on your specific needs. If you're running structured cabling and need high-speed Ethernet inside a building, Cat6 plenum cables are a strong choice for performance and safety compliance. If you need coaxial cable for TV, internet, or surveillance, RG6 remains the reliable standard. And if you're unsure what cabling solution fits your project, a knowledgeable network cable supplier can help you make the right call.

Final Thoughts

Coaxial cable has been the backbone of TV and internet connectivity for decades, and it's still earning its place in 2026 and beyond. It's not the fastest medium available, and it does have real limitations compared to fiber. But for the infrastructure that already exists and the hundreds of millions of homes and businesses still wired with coax, it continues to be a practical, cost-effective, and actively improving technology.

The key is knowing which type of coax to use, pairing it with the right connectors, and keeping cable runs as short as your setup allows. When used correctly, coaxial cable is a reliable transmission medium that will remain relevant for years to come.