What Ethernet Cable To Buy?

Looking to buy an Ethernet cable? You may have noticed that there are several types to choose from, like Cat 5, Cat 5e, Cat 6, or Cat 6a. But what do these mean and do they make a difference? Which one should you buy?

What are Cat ratings?

First of all, what are “Cat” ratings? For Ethernet cables, the “cat” stands for “category”. The different numbers represent different specifications for speed, cable length and bandwidth. All cables use a RJ45 connector and newer versions should be backwards compatible but you may notice a difference in performance.

So let’s go over all the different types of ethernet cables you may come across, from Cat5 all the way through Cat7 and beyond.

The Different types of cables

Cat 6 Cable label text

First things first, though. How do you tell what kind of Ethernet cable you have? Usually, Ethernet cables have words and numbers on the side that specify the type of cable. For example, in the picture above, you can see from the printed text that it is a Cat 6 cable.

It is important to note that rating certifications on the cables are the minimum, so it’s possible that a cable could give you better results than what it’s rated for. For example, there are Cat 5 cables capable of Gigabit speeds as reported by some users.

The ratings of the cables specify the speed of data transfer, the length of the cable and the bandwidth. Higher bandwidth means that the cable is able to use a wider range of frequencies which in turn helps to improve the speed of the cable.

Cat 5 cables

A cat 5 cable is rated for up to 100 Mbps at 100 meters with a 100 MHz bandwidth. Cat 5 cables are kind of hard to find in the stores these days given that they are only good for 100 Mbps. If you are still using Cat 5 cables, you should definitely consider upgrading them.

Cat 5e cables

When you hear someone talking about Cat 5 cables, they are probably referring to Cat 5e cables. Cat 5e or “Category 5 Enhanced”, is rated for up to 1 Gbps at 100 meters with a 100 MHz bandwidth. These improvements are a result of having more cables and better shielding. Cat 5e cables use four twisted pairs of wires compared to two in Cat 5 cables, allowing for more data throughput. Better shielding helps to reduce interference.

Cat 6 cables

The next level up from Cat 5e cables is Cat 6. Cat 6 cables are rated for up to 10 Gbps at 55 meters with a 250 MHz bandwidth. Cat 6 wires also have a plastic core to separate the wires internally which helps to reduce crosstalk. If you’re looking to get new Ethernet cables, Cat 6 is a good starting point and they aren’t too expensive.

Cat 6a cables

After Cat 6 cables, we have Cat 6A or Augmented Category 6. Cat 6A cables are rated for 10 Gbps at 100 meters with a 500 MHz bandwidth. They would be good if you’re looking to get full speed out of your home 10 Gbps network.

Cat 7 cables

And finally, we have the Cat 7 or Category 7 cable. Cat 7 cables are rated for 10 Gbps at 100 meters with a 600 MHz bandwidth. They have individual shielding of the wires which goes a long way to reduce crosstalk and reliability of the data transmission.

There are even Cat 8 cables nowadays but those are only practical for data centres at the moment.

Real World Ethernet Cable Test

Enough of the theory. How does the type of Ethernet cable affect your Internet speed in the real world. Would you notice a big difference in your Internet speed if you were to upgrade from a Cat 5e cable to a Cat 7 cable?

It is surprising but there’s not much of a performance upgrade at short distances between Cat 5E and Cat 7 cables. Here is the result of an experiment transferring data between a computer and a laptop 25 feet apart, with both having 2.5G network adapters.

Internet speed test for Cat 5e, Cat 6 and Cat 7 cables (Source)

As you can see, there wasn’t much difference between the cables at 2.5 Gbps over short distances. The main bottleneck in the test wasn’t the cables itself but rather the network adapter. To notice a difference, you’d need long distances, ‘noisy’ background and a 10 Gbps connection. For most home users, this isn’t a problem at the moment as of 2022.

Should you bother buying Cat 6a and higher Ethernet cables at all?

Now, you may be wondering, what’s the point of buying these better Ethernet cables if there isn’t an improvement in performance? In data centres and commercial equipment, 10 Gbps Ethernet is more common, but we’re starting to see 10 Gigabit consumer equipment as well. For these devices, a Cat 6 cable at minimum would be needed and for longer distances, a Cat 6a cable would be recommended.

But as of 2022, 10 Gbps connections for consumers still looks like it will be a while away. In conclusion, for home connections using a 1 Gbps connection, a Cat 6 cable would be more than enough. For 10 Gbps connection, a Cat 6a or Cat 7 cable might be worth considering.

A software engineer, I have a strong interest in technology, bot software and hardware. Blogging is a way to share what I have learned and hopefully people will find it useful.

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