If you've gotten this far, it's because you're considering using flat Ethernet cables Whether at home, in the office, or even in a professional rack, you're not entirely sure if they're a better option than the traditional round ones. The cable's shape might seem like a minor detail, but when you have to run it under doors, behind furniture, or along an entire hallway, it becomes a crucial factor.
Although at the standards level they all serve the same purpose, the reality is that there are important differences in installation, durability, interference protection, and space managementLet's break down, calmly but directly, everything you need to know about flat Ethernet cables: what they are, how they compare to round ones, how they perform in terms of speed and latency, what advantages they have, what drawbacks they have, and in what cases it's worth opting for one format or the other.
What exactly is an Ethernet cable and how does a flat cable differ from a round one?
An Ethernet cable is responsible for Carry the network signal via cable from your router, switch, modem, or other equipment This includes computers, consoles, smart TVs, access points, IP cameras, and other devices with an RJ45 port. Depending on the category (Cat5e, Cat6, Cat6a, Cat7, Cat8…), it will support varying speeds and operating frequencies.
In terms of form, today we basically distinguish between Flat Ethernet cables and round Ethernet cablesThe round cable is the classic: the twisted copper pairs are arranged in a circle, surrounded by insulation, fillers and, in many cases, some additional shielding layer that helps reduce interference and dissipate heat.
In a flat Ethernet cable, on the other hand, the copper wires are arranged in the form of a ribbonThe wires are laid side by side, maintaining the twisted-pair structure but in a much thinner format. This allows the cable to have a minimal thickness, ideal for passing through very narrow areas such as under carpets, baseboards, or door frames.
In both cases, typical network cable gauges are used, such as 26 AWG or even 32 AWG in some very thin modelsand can comply with the same ISO/IEC and TIA standards as long as they are well manufactured and certified for their category.
Basic technical characteristics: categories, frequency and performance
The shape of the cable doesn't determine its maximum speed; what really matters is the Ethernet cable categoryYou can find them in both flat and round formats:
- Cat5e: up to 1 Gbps (1000BASE-T), suitable for most current home connections.
- Cat6: designed for Gigabit and can reach 10GBASE-T at short distances, with typical performance up to 250 MHz.
- Category 6a: designed for 10 Gigabit Ethernet (10GBASE-T), with up to 500 MHz and improved crosstalk control.
- Cat7 / Cat8: geared towards more professional environments, higher frequencies and higher speeds, especially useful in data centers.
In the specific case of quality Cat6a flat cables, many manufacturers guarantee Supports up to 10 Gbps and frequencies up to 250 MHz or higheralways respecting the channel length limits defined by the standards (normally 100 meters maximum for copper in typical network applications).
There are also standard Cat6 UTP LAN cables, widely used as a reference, which offer Performance up to 250 MHz and compatibility with 10BASE-T, 100BASE-TX, 1000BASE-T and 10GBASE-TThey are usually manufactured with CCA (copper-clad aluminum) or pure copper conductor, PVC sheathing and 26 AWG gauge, in common colors such as blue or gray.
In short: as long as the cable meets its category (Cat5e, Cat6, Cat6a, etc.), A flat cable can offer the same speed as a round one.The differences appear more due to the physical construction, the armor and the quality of the materials than to the shape itself.
Practical advantages of flat Ethernet cables
One of the main reasons to choose flat cable is the ease of installation in real spacesNot in laboratory setups. In homes and offices, it's very common to have to navigate around furniture, door frames, and areas where a round cable is too bulky.
Thanks to their ribbon-like format, flat Ethernet cables are They can be placed against walls, baseboards, under carpets, or even through doorways with much more ease. This thinness allows the door to close better and reduces pressure on the cable, although it's best not to overuse it and avoid letting it become completely crushed for years.
Another strong point is that, being thinner and lighter, They take up less space when you group many cables together.In network racks, patch panels, or communication racks, this translates into a higher density of connections and a clearer airflow, which helps maintain good cooling.
From a storage and transport perspective, they are very manageable: They roll up easily, weigh less, and are packaged in compact reels.which is practical if you need to carry several in a backpack or work bag.
Finally, the design itself and the reduction in insulation and shielding material mean that, for the same category and length, Flat Ethernet cables are usually somewhat cheaper than many round models with full shielding.
Disadvantages and limitations of flat cables compared to round cables
The major historical drawback of flat Ethernet cables has been the shielding and protection against electromagnetic interference (EMI)Many inexpensive flat models do not include external shielding or additional insulation, making them more susceptible to interference in long runs or in electrically "noisy" environments.
This lack of shielding implies that, at distances close to the theoretical maximum (around 100 meters for a typical copper link), crosstalk problems between pairs and loss of signal quality may occur if the environment is demanding or if the cable runs alongside powerful electrical cables.
Furthermore, having less protective material, flat cables can be somewhat more sensitive to physical damagePinching, very forced twisting, blows or continuous crushing can end up damaging the internal conductors more easily than in a well reinforced round cable.
Heat must also be taken into account. Round cables often have internal fillings that help to... dissipate the heat generated when current flows (especially with high-power PoE). In flat cables, the insulation is less effective, so in very dense bundles or with a high PoE load, it's advisable to ensure that the manufacturer certifies its use for that type of application.
All this does not mean that a flat cable is "bad" by definition, but rather that It is not the ideal option for very long runs or installations with extreme demands.For short and medium links in residential or small office environments, these disadvantages are significantly reduced if the cable is of good quality.
Round Ethernet cables: when they are still the safest option
Round Ethernet cables continue to be the de facto standard in data centers, professional installations and structured cabling in buildings. Its classic design includes several layers of insulation, fillers and often shielding (UTP, FTP, STP, S/FTP, etc.) that protect the signal very well.
This construction makes them especially suitable for long routes, passages through walls, false ceilings and conduits where the cable may be coexisting with electrical cables, fluorescent lights, motors, or other sources of EMI for tens of meters.
In terms of durability, they usually offer greater resistance to tension, torsion and mechanical wearIf the cable is going to be installed for a long time in an industrial environment, in a data center or in infrastructures where you don't want to have to change it for many years, the round cable provides a lot of peace of mind.
They also excel when it comes to powering demanding PoE devices (access points, cameras, IP phones, etc.). Their superior heat management and, in many cases, their specifically certified for PoE or PoE++ (802.3bt) They make them better able to withstand high currents without overheating.
In return, these cables tend to be somewhat more expensive and bulky, and They are less convenient to hide behind furniture or pass under doorsBut when robustness, range, and total stability are priorities, the balance tips heavily in favor of the round cable.
Actual performance differences: speed, latency, and crosstalk
Theoretically, a flat Ethernet cable and a round one of Same category, same length, and well-made They offer the same maximum bandwidth and comply with the same standards (ISO/IEC 11801, ANSI/TIA-568, etc.). In other words, for 1 Gbps or 10 Gbps, both are valid.
In practice, the differences tend to appear as we approach the limiting conditions of the standardsVery long sections, a lot of electromagnetic noise around them, or many cables bundled together very close together. In these situations, the design and shielding of round cables usually offer a bit more margin.
Modern flat cables, especially high-quality Cat6a cables, have advanced significantly. Many now come with optimized twisted pairs that They minimize crosstalk (NEXT and FEXT) and with shielding techniques that match or closely approximate the performance of round ones.
In terms of latency, if the cable is within specification, You won't notice any appreciable difference between flat and round.Ping and stability in online games depend much more on the quality of the operator's network, the router, peering, etc., than on the physical format of the cable, provided that it is correct.
Where you might notice problems is if you use a very cheap flat cable of dubious quality, with a conductor that is too thin or poorly twisted, especially in lengths close to 20-30 meters or moreMicro-cuts, transmission errors, or speed losses can occur if the cable does not actually meet the category indicated on the sheath.
Flat cables and PoE: power and data over the same cable
Many modern devices are powered by PoE (Power over Ethernet), a standard that It sends electrical power and data through the same cableThis avoids the need to run a separate power line. This is very common in IP cameras, Wi-Fi access points, and VoIP phones.
In principle, flat Ethernet cables are compatible with PoE as long as the manufacturer specifies it and the conductor section and materials are sized accordinglyIn fact, there are flat models specifically designed to support everything from standard PoE to PoE++ (802.3bt type 3 and type 4).
The key is that the cable is of good quality and that we don't abuse extreme runs that push the limits of the standard, especially if we combine great length, very dense bundles, and high PoE powerIn these cases, the heat generated can be greater, and a round cable with better dissipation may be a more conservative option.
For typical home or small office installations, with moderate distances and reasonable PoE consumption (cameras, home access points, etc.), a good Cat5e or Cat6a flat cable is sufficient. It shouldn't cause feeding problems if it is properly certified.
Cable management and use in network racks
In communications cabinets and racks, cable management is key to having a clean, accessible infrastructure with good airflowFlat cables have gained ground there, especially when combined with specific cable management systems.
Its reduced cross-section and greater flexibility allow it to achieve much less bulky cable bundlesThey are easier to organize and secure. In some retractable cabling systems, flat Cat6a patch cables are used to pull out and retract the exact length needed without leaving excess cable in the rack, thus avoiding the typical "nests of spaghetti."
Furthermore, by taking up less space, they can help to improve airflow inside the rackreducing hot spots and making cooling more efficient. This is especially useful in data centers or densely populated racks where every inch counts.
However, for long vertical installations within buildings, plant backbones, or hidden runs in conduits, most integrators still opt for round copper cable or fiber optic cable to guarantee maximum robustness and long-term protection.
When to choose a flat Ethernet cable and when to go for a round one
A simple way to make the decision is to think about distance, environment and physical installation requirementsIt's not about one being "good" and the other "bad," but about using each one where it makes the most sense.
Flat Ethernet cables fit perfectly into short or medium installations in homes and officeswhere you need to hide the cable and prevent it from getting in the way: connect a PC or a console to the router in the same room, bring the network to a Smart TV just by crossing a door, or run the cable under a discreet rug.
If your scenario involves bringing network to The other end of the house with 20-30 meters of cable, several turns and two doorsA good quality flat cable can work very well as long as you protect it a minimum (don't keep squashing it with the door and avoid areas where it can be stepped on roughly).
For large installations, long runs, or environments with a lot of interference, round cables remain the logical choice. We're talking about data centers, wired office buildings, industrial facilities, or residential network backbones where the cable is embedded or passes through conduits shared with electrical lines.
Beyond the form, remember that the priority should always be Choose the correct category (Cat5e, Cat6, Cat6a…) and the appropriate lengthIt is preferable to leave a small margin of extra length without exceeding 100 meters of total channel length, and to ensure that the RJ45 connectors are properly crimped or of good quality if they are prefabricated patch cables.
Electrical quality, conductivity and evolution of flat cables
The first flat Ethernet cables had a reputation for being unreliable because many cheap models They did not maintain a constant electrical qualityOver time, the designs have improved and today it is possible to find flat cables with excellent conductivity.
By placing the conductors side by side, some manufacturers optimize the geometry to reduce irregularities in cable impedance and resistanceThis can help maintain a more uniform electrical path, resulting in less attenuation and fewer transmission errors.
At the same time, shielding technology has progressed: it is used metal sheets, improved insulators, and twisting schemes specific to combat crosstalk and interference, even in flat twisted pair formats.
This has allowed many modern flat cables to meet demanding standards such as ISO/IEC 11801 Class Ea and ANSI/TIA-568 for Cat6a, placing them at the same level as many round cables for channel certification purposes.
In summary, if you choose a flat cable from a reliable brand, with a clearly specified category and visible certifications, You will obtain a perfectly adequate electrical quality. both for home networks and for many professional applications.
With all of the above in mind, it can be said that the choice between flat and round Ethernet cables is not so much about speed as it is about... adapt to the physical environment, the length of the installation and the level of demandFlat cables have gone from being "the odd one out" to a very serious alternative, especially in homes, small offices and racks where space management and aesthetics are paramount, while round cables continue to be the workhorse for long runs, critical environments and projects where robustness is key.
