When it comes to connecting a desktop computer or laptop to a home network, users often encounter confusion over terminology. Many search for "Wi-Fi cable for computer," not realizing that Wi-Fi itself is a wireless technology that doesn't require wires to transmit a signal. However, a physical cable is still required to connect the router to the ISP or to connect the PC to the router. This cable ensures stable data transmission and is often used in areas where radio signals are less reliable.
In the technical world, this cable has a specific name - twisted pairThat's what engineers and installers call it. In common parlance, you might encounter names like "network cable," "patch cord," or "internet cable." All of these terms describe the same type of product, but with slight nuances in design and purpose. Understanding the differences between them will help you avoid mistakes when purchasing and setting up equipment.
In this article, we'll take a detailed look at the correct name for the cable used to connect to a router, the different speed standards, and why cable quality directly impacts your internet speed. You'll learn the differences between different cable categories and what to consider when choosing a ready-made solution or DIY crimping materials.
Technical name and types of network cables
The main technical name of the wire used to build local area networks and connect to the Internet is twisted pair (Twisted Pair). It got its name from its internal structure: insulated copper conductors twisted together in pairs. This twisting is not random; it is necessary to minimize electromagnetic interference that can arise from adjacent pairs or external radiation sources.
There are two main types of cable construction that are important to distinguish when purchasing. The first type is UTP (Unshielded Twisted Pair), which stands for unshielded twisted pair. This is the most common option for home use, and does not have an additional protective layer. The second type is FTP (Foiled Twisted Pair), which is equipped with a foil shield to protect against strong interference.
⚠️ Caution: Using shielded cable (FTP) without grounding the equipment may result in static electricity build-up and degrade the signal rather than improve it.
Cables with four or eight active wires are most often used to connect a computer to a router. Although a cable may physically contain eight wires, only four are sufficient for speeds up to 100 Mbps. However, modern standards require the use of all eight wires to achieve gigabit speeds.
Twisted Pair Cable Categories: CAT 5e vs. CAT 6
When choosing a cable for your computer, you will definitely come across markings CAT (Category), followed by a number. This classifies the cable by bandwidth and frequency characteristics. For home internet, two categories are most relevant: CAT 5e And CAT 6.
Category cables CAT 5e These cables are the current de facto standard for most home networks. They can transmit data at speeds of up to 1 Gbps over distances of up to 100 meters. This is more than sufficient for most ISP plans and for high-definition video streaming. Internally, these cables often contain four pairs of twisted wires.
Category cables CAT 6 CAT 5e cables are a more advanced version. They have thicker wires and are often equipped with a plastic separator inside, which separates the wire pairs further from each other. This allows for speeds of up to 10 Gbps over short distances (up to 55 meters). For the average user, the difference from CAT 5e may not be noticeable, but the performance boost is a welcome addition.
| Parameter | CAT 5e | CAT 6 | CAT 7 |
|---|---|---|---|
| Maximum speed | 1 Gbps | 10 Gbps (up to 55 m) | 10 Gbps |
| Frequency | 100 MHz | 250 MHz | 600 MHz |
| Shielding | Usually no | Often there is | Necessarily |
| Price | Low | Average | High |
What is a patch cord and how is it different?
In electronics stores, you'll rarely find a cable simply called "twisted pair." More often than not, the finished product with the connectors already installed is called patch cord (patch cord). This is a piece of cable of a certain length, with connectors attached to the ends. RJ-45.
Patch cords are designed to connect active equipment (computers, routers, switches) to network ports. They typically have a more flexible structure to withstand repeated bending. Unlike trunk cables, which are installed in walls and can be rigid, patch cords are designed for frequent use in user devices.
It's important to distinguish between pre-made patch cords and cable sold by the meter. Pre-made products undergo factory testing and have a guaranteed crimp quality. Cable cut from a coil and crimped by hand may be less expensive, but its quality depends on the skill of the technician and the tools used.
Can I use a telephone cable for internet?
Technically, a telephone cable (RJ-11) has 2 or 4 conductors and is thinner. Connecting it instead of a network cable (RJ-45) will not work without losing speed and stability, as the connectors are physically different, and the bandwidth of a telephone cable is insufficient for modern Ethernet standards.
RJ-45 connector design
At the ends of a computer network cable there is a connector, commonly called a "jack" or "connector." The correct technical name is RJ-45It is a transparent plastic box with 8 contacts through which the signal is transmitted to the device.
Inside the connector are metal contacts that, when crimped, pierce the insulation of the cable wires, creating a secure connection. On the top of the connector is a plastic tab that snaps into place in the computer or router port, preventing the cable from accidentally falling out. Be careful: this tab is quite fragile and can easily break if handled carelessly.
There are two standards for wiring the wires inside the connector: T568A And T568BTo connect a computer to a router (computer-to-computer or computer-to-router connection), both ends of the cable must be terminated using the same pattern; pattern B is most commonly used. If the color order is reversed, the cable will not work.
⚠️ Caution: When crimping the cable yourself, ensure that the cable's outer sheath insulation extends into the connector under the clamp. This will prevent the wires from breaking at the very entrance to the connector.
How to choose cable length and material
Cable length plays a critical role in connection stability. According to Ethernet standards, the maximum length of a twisted pair cable segment should not exceed 100 meters. However, for home use, it's more important to stay within reasonable limits to avoid unnecessary loops and tangled cables.
The material of the wires also matters. The ideal option is copper (Cu). It provides the best conductivity and flexibility. However, copper-clad aluminum (CCA) cables are often found on the market. They are cheaper, but have poorer signal conductivity, oxidize more quickly, and can break when bent.
When choosing the length, follow the principle "better a little longer than too tight." The cable should lie freely, without tension. A taut wire creates mechanical stress at the connector entry points, which over time leads to contact failure and network loss.
Instructions: How to connect a cable to a computer
Connecting a physical cable to a computer is extremely simple, but requires care. First, make sure your router is turned on and configured, and your internet connection is working. Then, locate the network port on the back of your computer.
The network port (LAN) looks like a cable connector, but is slightly narrower than a telephone jack. Insert the RJ-45 connector into the port until you hear a click. This means the latch is engaged. The operating system should then automatically detect the connection.
Check the lights near the port on your computer or router. They usually light up green or orange and may blink, indicating data is being transferred. If the lights are off, check the cable for damage or try a different port on the router.
☑️ Checking the cable connection
Common problems and their solutions
Even with high-quality equipment, users can encounter problems. One of the most common is Speed LimitIf your plan allows 500 Mbps, and the cable is old (CAT 5) or damaged, the speed may drop to 100 Mbps or even 10 Mbps.
Another common problem is intermittent disconnections. This often indicates a loose RJ-45 connector or a broken wire within the cable. This may not be noticeable visually, but the system will constantly display the message "Network cable not connected."
It's also worth mentioning the compatibility issue. Some older network cards don't support automatic cable type detection (Auto-MDIX). In these rare cases, a special crossover cable may be required, although modern equipment handles this issue automatically.
FAQ: Frequently Asked Questions
Is it possible to connect two network cables into one?
Yes, this can be done using a special RJ-45-to-RJ-45 coupler. However, each connection introduces additional signal loss. For home use, it's better to use a single, continuous cable of the required length.
Will the internet work if the connector only has 4 wires?
Yes, for speeds up to 100 Mbps, 4 conductors are sufficient. However, for higher speeds (1 Gbps and above), all 8 conductors must be present and functioning properly.
Does cable color affect internet speed?
No, the color of the outer insulation (blue, white, or black) is purely a matter of design and labeling convenience. The jacket color has no effect on technical specifications or data transfer speed.
What is the name of the USB to network cable adapter?
This device is called a USB to Ethernet adapter. It's necessary if your laptop or ultrabook doesn't have a built-in RJ-45 network port.