What Are the Three Main Types of Cabling? Twisted Pair, Coaxial and Fiber Explained

Every phone call, badge swipe, camera feed, and cloud login in a commercial building travels over a physical cable at some point. Wireless gets the attention, but the network behind it still depends on wires and glass in the walls and ceilings.

So what are the three main types of cabling? They are twisted pair, coaxial, and fiber optic. Each of them is different and suitable for different applications. This guide explains how each type works, where it belongs in a modern business, and how to choose the right mix for your building. Businesses looking for reliable network cabling services in Carson, CA can choose from several cabling options based on their network requirements, building layout, and connectivity needs.

Table of contents

1. The three main types of cabling at a glance
2. Twisted pair cabling (Cat5e, Cat6, Cat6A)
3. Coaxial cabling (RG-6, RG-59)
4. Fiber optic cabling (single-mode and multimode)
5. Side-by-side comparison
6. Fire ratings: plenum, riser and general purpose
7. How to choose the right cable type
8. Common mistakes and misconceptions
9. Where cabling is headed
10. Key takeaways
11. FAQ

The Three Main Types of Cabling at a Glance

The simplest way to tell the three apart is by how they carry a signal. Twisted pair and coaxial are both copper. They move data as electrical signals. Fiber moves data as pulses of light through glass or plastic strands.

That one difference drives almost everything else, including speed, distance, interference resistance, cost, and how the cable is installed.

• Twisted pair: The standard for Ethernet data, phones, Wi-Fi access points, and Power over Ethernet devices.
• Coaxial: Common for cable TV, broadband service entry, and older analog camera systems.
• Fiber optic: The go-to for backbones, long runs, and high-bandwidth links between rooms, floors, and buildings.

Twisted Pair Cabling: The Workhorse of Commercial Networks

How twisted pair works

A twisted pair cable contains copper wires twisted together in pairs inside one jacket. The cable has four pairs of wires inside the jacket. Each pair is twisted with a different number of twists per inch to help eliminate interference from adjacent pairs and other electrical devices.

The twist is the key. When external noise affects the cable, it impacts both wires equally, and the differential signaling cancels out the interference.

Shielded vs. unshielded

Twisted pair comes in unshielded (UTP) and shielded (STP or F/UTP) versions. Unshielded twisted pair (UTP) is the most popular choice for everyday office work. Shielded cable adds foil or braid for environments with heavy electrical noise, such as industrial floors or sites near motors and large equipment.

Cable categories: Cat5e, Cat6 and Cat6A

Twisted pair is sorted into categories under ANSI/TIA-568. ANSI/TIA-568 is the primary structured cabling standard used in North America. Published by the Telecommunications Industry Association, it defines the minimum electrical performance requirements and installation practices for telecommunications cabling in commercial buildings.

The categories most businesses encounter today:

• Cat5e: CAT5E remains widely deployed in Gigabit networks and legacy commercial environments.
• Cat6: CAT6 cable is rated for a minimum bandwidth of 250 MHz according to the ANSI/TIA-568 standard. It handles gigabit comfortably and 10-gigabit only on shorter runs.
• Cat6A: Category 6A cable is specified for 500 MHz and has improved alien crosstalk characteristics, allowing 10GBASE-T to be run for the same 100-metre (330 ft) maximum distance as previous Ethernet over twisted pair variants.

Key stat: Cat6 can run 100 meters (328 feet) for standard gigabit ethernet under ANSI/TIA-568. That breaks down into a 90-meter permanent link (horizontal cable in the walls and ceiling) plus up to 10 meters of patch cords at both ends combined.

The 55-meter question

Cat6 can carry 10-gigabit, but not at full distance. Category 6 cable segment distance drops to a maximum run length of 55 metres when used for 10GBASE-T. This cable length may be further reduced in hostile alien crosstalk environments. Some references put the hostile-environment figure lower still. Cat 6 cable’s maximum length is 55 meters (180 ft) in a favorable alien crosstalk environment, but only 37 meters (121 ft) in a hostile alien crosstalk environment.

For a small suite, that may never matter. For a warehouse or a multi-floor office with long horizontal runs, it is often the deciding factor in favor of Cat6A.

Power over Ethernet and heat

Twisted pair does more than carry data. It also powers cameras, access points, phones, and door hardware through Power over Ethernet (PoE). Power over Ethernet has evolved from 15.4W (802.3af) to 30W (802.3at) to 60W Type 3 and 90W Type 4 under 802.3bt.

More power means more heat inside cable bundles. TIA addressed this in TSB-184-A. It also provides guidelines for managing cable temperature rise and keeping cables operating below maximum temperature ratings. Among its recommendations, using Category 6A or higher-performing 4-pair balanced twisted-pair cabling for new PoE installation and limiting the number of cables per bundle to 24 to reduce potential temperature rise caused by installation factors, high ambient temperature, 26-AWG cables and higher currents.

Best uses for twisted pair: workstations, VoIP phones, printers, wireless access points, IP cameras, access control, point-of-sale terminals, and most horizontal cabling from a telecom room to the device.

Coaxial Cabling: Still Useful, Just More Specialized

How coaxial works

Coaxial cable has a single center conductor surrounded by insulation, a metal shield, and an outer jacket. The shield sits around the conductor on the same axis, which is where the name comes from. Made of braided copper or metal foil, it protects the signal from external electromagnetic interference (EMI).

A short history

Coax once ran office networks. Historically, coaxial cables were used for early Ethernet networks (10Base‑2, 10Base‑5) and remain common in broadband internet and cable TV installations due to their reliability. Twisted pair replaced it for data because it was cheaper, easier to terminate, and supported the star layout modern networks use.

RG-6 vs. RG-59

The two coax types you are most likely to find in a commercial building are RG-6 and RG-59. Both cables have the same impedance (75 ohms) and can handle the same types of signals, so the choice depends primarily on the installation environment.

• RG-6 is thicker and handles higher frequencies with less loss. RG-6 type cables have become the standard for CATV, mostly replacing the smaller RG-59, in recent years.
• RG-59 is thinner and older. That makes it good for lower frequency signals (anything under about 50 MHz). It shows up often in legacy analog CCTV systems.

Where coax fits today

Coaxial is still used for broadband, cable TV, and CCTV, but fiber and twisted pair dominate in enterprise and residential networking. In practice, a business might see coax at the carrier’s service entrance, in a lobby or break room TV system, or in an older camera system waiting to be upgraded to IP cameras on twisted pair.

Legacy coax is also a common find during cleanups. Many older homes and commercial buildings still have RG59 installed because it was once the standard for TV connections.

Best uses for coax: cable TV distribution, broadband service entry, legacy analog CCTV, and some RF and antenna applications.

Fiber Optic Cabling: Speed and Distance

How fiber works

Fiber optic cables are comprised of a core and cladding, where the core carries the light signal and the cladding acts as a protective glass layer surrounding the core. With the core having a higher refractive index than the cladding, total internal reflection occurs within the core. Because installation involves cable routing, termination, testing, and proper organization, businesses may wonder whether network cabling is hard to install and maintain.

Because fiber carries light instead of electricity, it is not affected by electromagnetic interference. That makes it a strong fit for runs near heavy electrical equipment and links between separate buildings.

Single-mode vs. multimode

Fiber comes in two main families.

• Single-mode (OS2): A very small core carrying one light path. Over 9/125 single-mode fiber, 10GBASE-LR optics reach 10 km and 10GBASE-ER reaches 40 km per IEEE 802.3ae.
• Multimode (OM3, OM4, OM5): A larger core carrying multiple light paths. It costs less to light up and works well inside buildings.

Multimode reach depends on grade and speed. 10 Gbps (10GBASE-SR): OM3: 300 meters. OM4: 400 meters. OM5: 400 meters. At higher speeds, the reach shrinks. At 100G with SR4 optics, distances drop to 70 m (OM3) or 100 m (OM4).

Key stat: Under the TIA-598 standard, cable jacket color identifies fiber type: yellow for single-mode, aqua for laser-optimized OM3/OM4 50/125 multimode, and lime green for OM5.

Why single-mode is often the long-term play

Single-mode has a big upgrade advantage. An OS2 fiber pair installed today can support 100G, then 400G, then 1.6T as transceiver technology evolves, without touching the fiber plant. Multimode fiber does not support practical WDM. When an OM3 or OM4 run reaches its bandwidth ceiling, the only option is to pull additional cable.

That said, multimode is still a sensible choice for short in-building backbones. Industry guidance commonly recommends for in-building structured cabling with runs under 150 meters and high port density: OM3 minimum, OM4 preferred.

Fiber’s tradeoffs

Fiber is not the answer for every link. Fiber is more fragile and thinner than twisted-pair and coaxial cables, making it more careful to install, operate and maintain. Termination and testing also require specialized tools and training. Most devices on a desk or ceiling still connect over copper, so fiber usually serves the backbone while twisted pair handles the last stretch.

Best uses for fiber: backbones between telecom rooms, riser runs between floors, links between buildings, long warehouse runs, data center connections, and carrier service entrances.

Twisted Pair vs. Coaxial vs. Fiber: Side-by-Side Comparison

Factor	Twisted pair	Coaxial	Fiber optic
Signal type	Electrical	Electrical	Light
Common types	Cat5e, Cat6, Cat6A	RG-6, RG-59	Single-mode (OS2), multimode (OM3/OM4/OM5)
Typical max distance	100 m channel	Varies by type and signal	Hundreds of meters (multimode) to many kilometers (single-mode)
Interference resistance	Good (better with shielding)	Good	Immune to EMI
Carries power (PoE)	Yes	No (not for Ethernet PoE)	No
Relative install complexity	Lowest	Moderate	Highest
Typical commercial role	Horizontal cabling to devices	TV, broadband entry, legacy CCTV	Backbone and long-distance links

Fire Ratings: Plenum, Riser and General Purpose

Choosing a cable type is only half the decision. The jacket rating has to match where the cable runs. Article 800 of the National Electrical Code (NEC) defines communications cable ratings such as CMP and CMR, and NEC Article 770 governs optical fiber cables.

• CMP (plenum): For air-handling spaces, such as above many drop ceilings where HVAC return air moves.
• CMR (riser): For vertical runs between floors.
• CM/CMG (general purpose): For standard horizontal runs outside plenum and riser spaces.

The rule is simple. A higher-rated cable can always substitute for a lower rating, but never the reverse. Local inspectors have the final word, so verify with your AHJ — Local codes may impose additional requirements beyond the NEC.

It also helps to know that performance and fire safety are separate standards. TIA-568 governs how the cable performs, while UL 444 and the NEC govern the jacket and where it is allowed to go. A complete specification respects both at once.

How to Choose the Right Cable Type for Your Building

Most commercial buildings use all three types, or at least two. The question is where each one goes. Here is a practical way to work through it.

1. Count the devices. List every workstation, phone, access point, camera, door reader, display, and POS terminal. Each needs a drop.
2. Measure the distances. Any horizontal run approaching 90 meters, or any 10-gigabit link over about 55 meters, points toward Cat6A. Anything longer points toward fiber.
3. Check power needs. High-power PoE devices, like modern access points and PTZ cameras, favor Cat6A and smaller bundles.
4. Look at the environment. Heavy electrical noise favors shielded cable or fiber. Links between separate buildings strongly favor fiber.
5. Map the pathways. Identify plenum, riser, and general spaces so the jacket rating is right from the start.
6. Plan for growth. Cable often outlasts several generations of network equipment. Spare drops, spare fiber strands, and room in the pathways cost far less during the original install than later.

A common, well-balanced design for a mid-size commercial site looks like this: fiber backbone between telecom rooms, Cat6A horizontal cabling to Wi-Fi and high-power PoE devices, Cat6 or Cat6A to desks, and coax only where the carrier or a TV system requires it.

For help applying this to a real site, see our [Network Cabling Company Carson CA](INTERNAL LINK) page for cable options, or our [Commercial Network Cabling Company in Carson, CA](INTERNAL LINK) page for office, warehouse, and retail projects.

Common Mistakes and Misconceptions

“Cat6 does 10-gigabit, so it’s future-proof.” Only on short runs. Past about 55 meters, 10GBASE-T needs Cat6A.

“Wireless means we need less cabling.” The opposite is often true. Every access point needs a cable, and newer access points draw more power. Wireless replaces cabling: Not for high‑performance or critical networks.

“Any fiber is the same.” Single-mode and multimode are not interchangeable, and the optics must match the fiber. Mixing them on one link will not work.

“A cable that lights up is a cable that passes.” A basic continuity test does not prove performance. A wire-map test does not validate 10G. Run a Level IV+ certifier in channel mode and save the report.

“Riser cable is fine above the ceiling.” Not if that ceiling is a plenum space. Using the wrong jacket rating can mean failed inspections and costly rework.

“Old coax can be reused for the new network.” Legacy RG-59 from an analog camera system generally cannot carry modern Ethernet. Upgrades to IP cameras usually mean new twisted pair runs.

Where Cabling Is Headed

A few trends are shaping how businesses cable their buildings now:

• Higher PoE loads. As more devices run on 60W and 90W PoE, bundle size, heat, and cable gauge matter more during design.
• Cat6A as the new default. CAT6 and CAT6A are the current standards for new commercial installations that require higher bandwidth, Power over Ethernet (PoE++), and future scalability.
• More single-mode in backbones. Its ability to support faster optics without new cable makes it attractive for long-term plans.
• Updated standards. ANSI/TIA-568.2, was updated to revision E in late 2024 and defines how categories like Cat6 and Cat6A are specified and tested.
• Coax continuing to narrow. Coax will likely stay at service entrances and in video distribution, while new camera and data work moves to twisted pair and fiber.

Key Takeaways

• The three main types of cabling are twisted pair, coaxial, and fiber optic.
• Twisted pair (Cat5e, Cat6, Cat6A) is the standard for connecting devices and delivering PoE.
• Coax (RG-6, RG-59) remains common for TV, broadband entry, and legacy cameras.
• Fiber (single-mode and multimode) is the best choice for backbones, long runs, and links between buildings.
• The right jacket rating (CMP, CMR, CM) matters as much as the cable type.
• Certified testing and documentation prove the system performs as designed.

Frequently Asked Questions

What are the three main types of cabling?
The three main types are twisted pair, coaxial, and fiber optic. Twisted pair and coax carry electrical signals over copper, while fiber carries light through glass or plastic strands.

Which type of cabling is most common in offices?
Twisted pair, usually Cat6 or Cat6A, is the most common cable for connecting computers, phones, printers, Wi-Fi access points, and cameras in commercial buildings.

Is fiber optic better than copper?
Fiber is better for long distances, high bandwidth, and areas with electrical interference. Copper twisted pair is still the practical choice for most device connections because it is easier to install and can deliver Power over Ethernet.

What is the difference between Cat6 and Cat6A?
Cat6 supports gigabit at 100 meters and 10-gigabit at shorter distances. Cat6A supports 10-gigabit across the full 100-meter channel and is recommended for new PoE installations.

Is coaxial cable still used for networking?
Coax is rarely used for internal business networks today. It remains common for cable TV, broadband service from carriers, and older analog security camera systems.

What is the difference between single-mode and multimode fiber?
Single-mode fiber carries one light path and reaches many kilometers. Multimode carries several light paths, costs less to connect, and suits shorter runs inside a building.

What does plenum-rated cable mean?
Plenum-rated (CMP) cable has a fire-resistant, low-smoke jacket designed for air-handling spaces, such as some areas above drop ceilings. Riser-rated (CMR) cable is for vertical runs between floors.