How to Choose the Right Ethernet Cable: Complete Buying Guide

Introduction

Choosing an Ethernet cable is not as simple as picking the highest category printed on the packet. The right cable depends on your internet speed, network equipment, installation length, environment and how the cable will be used. A Cat6 cable may be an excellent choice for one setup but unnecessary for another, while cable construction can matter just as much as the category. This guide explains the practical points to consider before buying an Ethernet cable for your router, computer, Smart TV, gaming setup, CCTV system or other network device.

Does Ethernet Cable Category Actually Matter?

Yes, but you should choose the category according to the capability of your network rather than automatically buying the highest specification available. Cat5e, Cat6 and Cat6A can all be useful in different situations, and buying a higher category does not by itself make your internet connection faster than the speed provided by your router, switch, network adapter or internet plan.

Our dedicated Cat5e vs Cat6 vs Cat6A guide goes deeper into the differences between these categories. For this guide, the more useful question is: which category makes sense for your particular setup?

Cat5e

Cat5e is suitable for many everyday networks and can support Gigabit Ethernet over standard installations. It is often enough for homes where the router, computer, TV or other equipment does not require higher networking speeds.

Cat6

Cat6 is a popular choice for new home, office and commercial installations because it offers greater performance headroom while remaining relatively easy to source and install. It is a sensible all-round option when you're building a new network and want some room for future upgrades.

Cat6A

Cat6A is designed for higher-performance networking and can support 10 Gigabit Ethernet over the appropriate distance. It is more commonly considered for demanding networks, commercial installations and situations where higher bandwidth and greater future capacity justify the additional cost and cable size.

What Ethernet Cable Do You Need for 100 Mbps, 500 Mbps or 1 Gbps Internet?

Your internet plan is only one part of the equation. The actual network speed is limited by the slowest component in the connection, which can include the router, switch, network port, Wi-Fi system or computer adapter.

100 Mbps Internet

A standard Cat5e cable is already more than adequate for a 100 Mbps connection. There is generally no practical reason to buy a premium high-category cable solely because your internet speed is 100 Mbps.

500 Mbps Internet

Cat5e can still be sufficient for a 500 Mbps connection because the cable category itself isn't the limiting factor in this situation. Cat6 is also a perfectly reasonable choice when you're replacing cables or setting up a new network.

1 Gbps Internet

Cat5e can support Gigabit Ethernet under standard conditions, so you do not need Cat6 simply because your internet plan has reached 1 Gbps. However, Cat6 can be a good choice for new installations when you want additional performance margin and a more future-ready setup.

Speeds Above 1 Gbps

Once you move beyond standard Gigabit networking, the capabilities of the complete network become increasingly important. Your router or switch, device network port and cable category all need to support the intended speed.

Does Cat6 Make Your Internet Faster?

Not by itself.

Replacing a working Cat5e cable with Cat6 does not automatically increase your internet speed if your internet plan, router and connected device are already operating at their maximum supported speed. For example, if your connection is limited to 100 Mbps, installing a Cat6 cable will not turn it into a 1 Gbps connection.

Cat6 becomes valuable when your network equipment and connection can actually take advantage of its capabilities, or when you're installing new cabling and want additional performance headroom.

Does Ethernet Cable Length Affect Speed?

Cable length can matter, but a normal-length Ethernet cable should not suddenly make a properly functioning network slower simply because it is longer. Standard Ethernet is designed to operate reliably over distances within its specified limits.

For typical home and office installations, cable lengths such as 2 m, 5 m, 10 m or 20 m are generally straightforward when the cable and connectors are properly made.

When Length Becomes Important

Very long cable runs require more attention to cable category, installation quality and the network speed you want to achieve. For long permanent installations, don't simply buy the longest cable available without checking its specifications.

Avoid Excess Cable Where Possible

Extra cable should not be left tightly coiled or routed carelessly just because you bought a much longer length than necessary. Measure the route and choose a practical length with enough allowance for routing and movement.

Flat vs Round Ethernet Cable: Which Should You Buy?

Flat and round Ethernet cables can both work well, but they are designed with different practical advantages in mind.

Flat Ethernet Cable

Flat cables are easier to route under some carpets, around furniture and through narrow gaps. They can be useful for short temporary connections where appearance and easy routing matter.

However, flat cables vary considerably in construction, so the shape alone should not be treated as an indicator of quality.

Round Ethernet Cable

Round cables are the more conventional choice for structured network installations and general-purpose networking. They are typically easier to identify, route through standard cable-management systems and use for longer or more permanent runs.

For a fixed home, office or CCTV installation, a good-quality round Ethernet cable is generally the more practical choice.

Copper vs CCA Ethernet Cable: What's the Difference?

This is one of the most important things to check before buying because two cables can carry the same Cat6 label while using very different conductor materials.

Pure Copper Ethernet Cable

Copper conductors offer good electrical conductivity and are the preferred choice for reliable network cabling. Quality copper Ethernet cables are suitable for permanent installations and demanding network applications.

CCA Ethernet Cable

CCA stands for Copper-Clad Aluminium. These cables use an aluminium conductor with a copper coating rather than a solid copper conductor.

CCA cables can be cheaper and may work for some basic applications, but they are not equivalent to proper copper network cabling. Their electrical characteristics and performance under higher loads or longer runs can differ from copper conductors.

If reliability matters, especially for permanent installations, check the conductor material rather than buying purely on the Cat category printed on the package.

UTP vs Shielded Ethernet Cable: Do You Need Shielding?

Most home networks use UTP (Unshielded Twisted Pair) cable, and that is perfectly adequate for many ordinary installations. Shielding becomes more relevant when the cable is installed in an environment with significant electromagnetic interference.

UTP

UTP cables are simpler, flexible and widely used in homes, offices, televisions, routers and general networking applications.

Shielded Cable

Shielded Ethernet cables include additional protection designed to reduce electromagnetic interference. They can be useful in environments with substantial electrical equipment, industrial machinery or other sources of interference.

For a normal home router-to-PC or router-to-TV connection, you generally do not need to pay extra for shielding unless your installation actually presents an interference problem.

Solid vs Stranded Ethernet Cable

The internal conductor design also matters when choosing cable for a permanent installation versus a short patch connection.

Solid-Core Cable

Solid-core Ethernet cable uses a single solid conductor for each wire. It is commonly used for permanent installations where the cable is routed through walls, conduits or structured network infrastructure.

Stranded Cable

Stranded cable uses multiple small strands for each conductor, making it more flexible. It is well suited to short patch cables that are frequently moved or connected between devices and network equipment.

For example, a cable running permanently from a network cabinet to a wall outlet may be better suited to solid-core construction, while a short router-to-computer patch cable benefits from the flexibility of stranded cable.

What Should You Look for in an RJ45 Connector?

The connector is another part of the cable that can affect reliability. A good RJ45 connector should fit securely into the Ethernet port, make consistent contact with the pins and include proper strain relief where the cable enters the plug.

Connector Fit

The plug should click securely into the Ethernet port and should not feel excessively loose.

Strain Relief

A good strain-relief boot helps protect the cable where it meets the connector, particularly on cables that are frequently moved or unplugged.

Connector Quality

A poor-quality connector can cause intermittent connectivity even when the cable itself is otherwise good. For pre-terminated cables, look for consistent construction and a secure locking tab rather than judging the cable solely by its outer appearance.

Indoor vs Outdoor Ethernet Cable

The installation environment matters when choosing an Ethernet cable. A cable running behind a TV or inside an office has very different requirements from one exposed to sunlight, rain, temperature changes or outdoor conditions. Using the appropriate cable for the environment helps prevent premature damage and connectivity problems.

Indoor Ethernet Cable

Indoor cables are suitable for bedrooms, offices, server rooms, TV units and other protected environments. They are generally easier to route and can be chosen primarily based on category, conductor material, flexibility and the required length.

Outdoor Ethernet Cable

Outdoor Ethernet cables are designed with additional protection against environmental conditions such as sunlight and moisture. If the cable will run along an exterior wall, terrace, garden or between buildings, choose a cable specifically rated for outdoor use rather than assuming an indoor cable will provide the same durability.

Can You Use Cat6 With an Older Router or Device?

Yes. Ethernet standards are designed to work across different generations, so a Cat6 cable can generally be used with equipment that supports Cat5e or another compatible Ethernet standard. However, the cable does not upgrade the network device itself.

For example, connecting a Cat6 cable to a router with a 100 Mbps Ethernet port will still give you a maximum link speed determined by that port. The same cable can later be reused with faster equipment, which is one reason Cat6 can be a practical choice when replacing older cables.

Can You Use Cat6 Cable for a Cat5e Device?

Yes. Using a higher-category Ethernet cable with a lower-category compatible device is generally fine. The network will operate according to the capabilities of the connected equipment rather than automatically adopting the maximum capability of the cable.

This means you can use Cat6 between a router and a computer that currently supports Gigabit Ethernet without any problem. If you upgrade the equipment later, the existing cable may already be suitable for the newer network.

Can Ethernet Cable Be Used for CCTV?

Yes. Ethernet cable is widely used in IP CCTV systems, but the exact requirements depend on the cameras, network equipment and installation distance.

IP Cameras

IP cameras can use Ethernet cabling to carry network data, and some systems can also use Power over Ethernet (PoE) so that compatible cameras receive both data and power through the same network cable.

PoE and Cable Choice

For PoE installations, conductor quality becomes especially important. Proper copper Ethernet cable is preferable for reliable power delivery, particularly for longer runs. Avoid choosing cable purely by the Cat number when the cable will also carry power.

Distance

If you're installing cameras at longer distances, check the camera, PoE switch or injector specifications and the recommended cable type before installation. Don't assume that any Ethernet cable will provide identical results over every distance.

Ethernet Cable for Gaming: Does It Actually Matter?

A wired Ethernet connection can provide a more consistent connection than Wi-Fi in many gaming environments because it avoids wireless interference and signal fluctuations. However, the cable category does not directly reduce gaming ping simply because it is a higher category.

For most modern gaming setups, a good-quality Cat5e or Cat6 cable is already sufficient for Gigabit networking. If you're building a new setup and want additional headroom, Cat6 is a sensible choice. The bigger factors affecting latency are your internet connection, routing, server location and network conditions.

Ethernet Cable for Smart TV: Which One Should You Buy?

For connecting a Smart TV directly to your router or network switch, you usually do not need an extremely high-specification cable. A properly made Cat5e or Cat6 cable is sufficient for most TV streaming and network applications.

The important advantage of using Ethernet with a Smart TV is consistency. A wired connection can be useful when Wi-Fi is unreliable, the TV is far from the router or the wireless signal has to pass through several walls.

Ethernet Cable for a Computer or Laptop

For desktop computers and other devices that remain in one place, Cat5e or Cat6 are practical choices depending on the network speed and installation. A short flexible patch cable is convenient for connecting a computer directly to a router or switch.

For laptops, a USB-to-Ethernet adapter may be required if the laptop does not have an Ethernet port. In that case, the adapter's supported network speed also becomes part of the overall connection.

Pre-Made Ethernet Cable vs Cable by the Metre

Choosing between a ready-made Ethernet cable and cable sold by the metre depends on the type of installation.

Pre-Made Ethernet Cable

Pre-terminated cables already have RJ45 connectors attached and are convenient for routers, computers, TVs, gaming consoles and other devices. They require no specialised termination tools and are ideal for short, straightforward connections.

Cable by the Metre

Cable sold by the metre is useful for permanent installations where you need to route the cable through walls, conduits, ceilings or larger spaces. You can cut the cable to the required length and terminate it with compatible connectors.

This approach requires the correct tools and termination technique, so it makes more sense for structured installations than for a simple router-to-TV connection.

Common Ethernet Cable Buying Mistakes

Choosing the wrong Ethernet cable is usually a result of focusing on one specification while ignoring the rest of the installation.

Buying Only by Cat Rating

Cat6 is not automatically better for every situation. Consider your network speed, installation and cable construction before paying extra for a higher category.

Ignoring CCA Construction

A cable can be marketed as Cat5e or Cat6 while using CCA conductors. Always check whether the cable uses proper copper conductors if reliability is important.

Buying Much More Length Than Needed

Extra length can complicate cable management and make installation unnecessarily messy. Measure the route and choose a practical length with some allowance.

Using Indoor Cable Outdoors

Indoor cable can deteriorate when exposed to sunlight and moisture. Use cable specifically intended for outdoor environments when required.

Choosing Shielding Without Needing It

Shielded cable can cost more and may be less flexible. For an ordinary home network, UTP is usually sufficient.

How to Choose the Right Ethernet Cable for Your Setup

Start with the device and installation, not the cable packet.

For a basic home network, Cat5e may already be sufficient. Cat6 is an excellent all-round choice for many new installations. For higher-performance networks or specialised applications, a higher-category cable may be appropriate.

Then check the details that are easy to overlook: copper vs CCA, cable length, indoor vs outdoor use, solid vs stranded construction, shielding and connector quality. These factors can matter just as much as the category printed on the box.

Frequently Asked Questions

Is Cat6 faster than Cat5e?

Cat6 has higher performance capability, but it does not automatically make your internet faster. The actual network speed depends on the complete connection.

Can I use Cat6 for my Smart TV?

Yes. Cat6 is suitable for connecting compatible Smart TVs to a router or network switch.

Is CCA Ethernet cable good?

CCA can work in some basic situations, but it is not equivalent to proper copper network cable. For reliable permanent installations, copper is generally the better choice.

Can Ethernet cable be used outdoors?

Yes, but use a cable specifically designed for outdoor installation when it will be exposed to sunlight or moisture.

Does a longer Ethernet cable reduce speed?

Standard Ethernet is designed to work over specified distances, but very long installations require more attention to cable quality, category and installation conditions.

Conclusion

The right Ethernet cable is the one that matches your network speed, equipment, installation distance and environment rather than simply having the highest category number. For many everyday connections, Cat5e or Cat6 is more than sufficient, while demanding or specialised networks may justify higher specifications.

Before buying, check the cable's category, conductor material, length, construction and intended environment. A well-chosen Ethernet cable can give you a reliable wired connection without spending extra on specifications your network cannot use.

Looking for the right networking products? Explore our Cat6 cables, LAN cables, adapters and other connectivity products featured below.

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