UTP Cable vs. STP Cable

It is well known that twisted pair cable consists of a pair of insulated wires twisted together, which is widely used for Ethernet cable. In general, there are several types of twisted pair cables, such as, UTP (unshielded twisted pair) cable, STP (shielded twisted pair) cable, SSTP (screened shielded twisted pair) and FTP (foil twisted pair). Among these cables, UTP and STP are the two most commonly used cables which occupy the majority of the market. Are you familiar with UTP cable and STP cable? What is the difference between UTP and STP cables? Which one is better? If you don’t have enough knowledge of these two kinds of cables, you may feel confused when you plan to buy bulk Ethernet cables. As it is necessary to make a choice between UTP and STP cables for deploying the network, this article is going to introduce these two kinds of twisted pair cables in details, seeking the answer.

What Is UTP Cable?

From its name, it is easy to learn that UTP cable has no shielding. Considering that the shielding feature is mainly designed to reduce Electromagnetic Interference (EMI), does the UTP cable have this function if put into use? In fact, UTP cable reduces the interference directly through the twisted pairs inside the cable. Furthermore, without shielding, UTP cable is thinner, lighter, more flexible and more durable than STP cable, which makes cable installation easier, especially in limited space. In addition, not relying on an outer shield, less money will be spent on the maintenance of UTP cable, which is beneficial to save the investment on installation and maintenance. To better understand the inner structure of UTP cable, here is a figure for you.

UTP Cable

What Is STP Cable?

STP cable has a metal shield around each twisted pair which is composed of copper tape, a layer of conducting polymer or a braid (made of copper or aluminum mostly). The shield can be applied to each pair of the cable or to all pairs together. With the shield, EMI can be greatly reduced, which enables the high performance of data transmission between different devices. Also, the crosstalk can be efficiently prevented by the shield, which exists among the wires inside the cable. However, the shield of STP cable is quite fragile and rigid. If the shield suffers damage, the cabling system is likely to be affected by interference. Therefore, it is necessary to pay much attention to the installation and maintenance of STP cable. You can learn more about the structure of STP cable from the figure below.

STP Cable


Due to different characteristics, the two kinds of cables are used in different environment.

STP cables are often used in high EMI environment where interference is a risk. For example, airports, hospitals and factories usually have lots of machines that can produce interference, so it would be more beneficial to apply STP cables. And STP cables are also useful when cables are surrounded by fluorescent lights, microwave ovens, powerful motors and other equipment with larger electromagnetic interference.

UTP cables are typically used in offices and homes. If the interference or crosstalk is not the main concern, it is suggested to choose UTP cables which are lower in cost. But if the environment is full of powerful magnetic fields which may have an influence on the performance of network, STP cables are absolutely the optimal choice.


After discussion, we can learn that UTP cable is cheaper, easier to install and more suitable for environment with low EMI; while STP has a stronger ability for anti-interference and needs careful maintenance. If the place you deploy network has high EMI, STP cable is highly recommended; if the EMI is not a risk, you are suggested to choose UTP cable which is lower in cost. I hope this article can help you choose the suitable Ethernet cable. There are different types of Ethernet cables available in FS.COM, such as UTP bulk cat5e cable, STP bulk cat6 cable, UTP cat6a bulk cable, STP cat7 bulk cable and so on. If you want to know more details, please visit our site or contact us.

Cat6 VS. Cat6a

As the data speed increases from Fast Ethernet to Gigabit Ethernet, cables for the network connection are also required to be improved. Cat6 and Cat6a are two kinds of copper cables for Gigabit Ethernet. Do you know which one you should use, Cat6 or Cat6a? Could these two types replace each other? Now this article will tell the difference from five aspects: crosstalk, thickness, transmission distance, cost and durability. First, let’s come to the overview of Cat6 and Cat6a cables.

Overview of Cat6 and Cat6a

Cat6 is a standardized twisted pair cable for Ethernet and it is backward compatible with the Cat3, Cat5 and Cat5e cable standards. In addition, Cat6 provides performance of up to 250 MHz and is suitable for 10BASE-T, 100BASE-TX (Fast Ethernet), 1000BASE-T/1000BASE-TX (Gigabit Ethernet), and 10GBASE-T (10-Gigabit Ethernet). Cat6a is the “Augmented” version of Cat6 and offers better performance. It is defined at frequencies up to 500MHz—twice than that of Cat6, and it is popular among 10G Ethernet applications. Here is a figure of Cat6 and Cat6a cable.

Cat6 vs. Cat6a

Comparison Between Cat6 and Cat6a

The name of Cat6a indicates that it was created to further improve on the performance of Cat6 for Ethernet cables. So what are the differences between them? This part will focus on the comparison between Cat6 and Cat6a cables from from four aspects: crosstalk, thickness, transmission distance and cost.


We know that Cat6 features more stringent specifications for crosstalk and system noise, while Cat6a cable is stricter when it comes to shielding and protection against alien crosstalk. Crosstalk occurs when the signal from one cable leaks into another. This can distort the signal through the introduction of noise and force the network devices to work at a slower speed. Because of this, Cat6a cables would work better in situations where it is to be bundled with a lot of other cables.


Another identifying characteristic of the Cat6a cable is its thickness. Cat6 looks just like the Cat5 and Cat5e cables that preceded it. Cat6 cable manufacturers had to come up with approaches to adjust to the stricter alien crosstalk shielding, thereby making it thicker with others adopting odd shapes. While Cat6a cable is slightly thicker than Cat6 cable.

Transmission Distance

Cat6 cable can reach 100 meters for slower network speeds (up to 1,000 Mbps) and higher network speeds over short distances. But it can support only 55 meters at the speed of 10Gbps and 33 meters in high crosstalk conditions. While Cat6a cables can support the distance over 100 meters at the speed of 10Gbps.


The cost of Cat6a is higher than that of Cat6. Take Fiberstore’s cables as an example, bulk Cat6 cable 1000ft(305m) is 130.00 US$, while bulk Cat6a cable 1000ft(305m) is 180.00 US$. The more cables you purchase, the bigger the price difference will be. And the price difference is not only caused by the cable. Other matched connection components should also be considered.


As mentioned above, Cat6a cable is thicker and heavier than Cat6 cable. Cable trays can not hold as many Cat6a cables as Cat6 cables. When laying cables on the trays, you should better not bend cables too much as this can damage the wiring and influence network performance. The minimum radius that a cable can be bent without damaging is called the bend radius. The lower the bend radius, the more you can bend the cable. As Cat6a cable is bulkier than Cat6, Cat6a cable has a larger bend radius than Cat6 cable.


From this article, you can make a clear identification of Cat6 and Cat6a cables. When you plan to purchase this copper cable, you need to consider their differences like crosstalk, thickness, transmission distance, cost and durability, etc. Hope you can choose the suitable cable and build a high performance network.