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The wrong Ethernet cable can reduce your connection speed. For example, avoid using a CAT 5 cable if your internet speed is 200Mbps or more.
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A damaged Ethernet cable can also cause slow speeds. A broken clip, for instance, stops the contacts from fully connecting to the Ethernet port.
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To check everything, I will show you how to find the category of your Ethernet cable to see if it is the right one. Then, I will guide you in fixing possible Ethernet connection problems.
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Start by checking your cable’s category.
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Look at your Ethernet cable to find the category number. You should see it printed on the outer cover.
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The category number shows the cable’s design and maximum speed for a certain distance. A higher number means a newer design and better data transfer over that distance.
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For example, a CAT 3 cable is ancient and extremely slow. A CAT 8 cable is new and much faster than most home internet connections.
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Below is a list of speeds for each category.
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| Cable Type | Highest Speed (Estimated) |
| CAT 3 | 10 Mbps |
| CAT 5 | 100 Mbps |
| CAT 5e | 1,000 Mbps |
| CAT 6 | 1,000 Mbps |
| CAT 6a | 10,000 Mbps |
| CAT 7 | 10,000 – 100,000 Mbps |
| CAT 7a | 10,000 Mbps |
| CAT 8.1 / 8.2 | 25,000 – 40,000 Mbps |
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The chart indicates that you should not use a CAT 5 cable between your modem or fiber ONT and router if your internet speed exceeds 100Mbps.
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For speeds above 101Mbps, choose a CAT 5e or a newer version.
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For internet speeds up to 10,000Mbps (10Gbps), a CAT 6a or a newer cable works best.
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The chart shows that only a 49-foot CAT 7 cable can support the full speed of Ziply Fiber’s 50Gbps plan, but no known Ethernet port can handle that speed.
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Fixing Ethernet Issues
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If you are using the correct cable, check for possible issues with its length, connectors, or other factors.
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Measure the Cable Length
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Ethernet cables work best up to 328 feet. For instance, a CAT 6 cable can reach 1Gbps, while a CAT 6a cable supports 10Gbps at 328 feet.
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However, CAT 7 and CAT 8 cables allow much higher speeds but only at shorter distances.
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| Category | Highest Speed | Maximum Distance |
| CAT 7 | 40Gbps (40,000Mbps), 100Gbps (100,000Mbps) | 164 ft., 49 ft. |
| CAT 8.1, 8.2 | 25Gbps (25,000Mbps), 40Gbps (40,000Mbps) | 98 ft., 79 ft. |
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You will not notice speed differences between short and long cables if they stay within the specified limit.
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However, cables beyond the recommended length will lose signal, reducing speed. A CAT 7 cable, for example, will only provide a 10Gbps connection if it is over 164 feet long.
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Short cables are better because data travels faster over shorter distances. It is similar to a car moving at 50 MPH, reaching a 10-mile destination faster than one covering 100 miles at the same speed.
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With Ethernet, the time difference is in nanoseconds. Electricity moves at 70% of light speed through copper, making the argument irrelevant.
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Cable length only affects speed when it exceeds the specification’s limit.
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Still, using a 50-foot cable for devices placed next to each other is unnecessary. Managing the extra length would be difficult.
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Check the Cable for Any Issues
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An Ethernet cable contains multiple twisted copper wire pairs. These wires are wrapped in foil and covered with a strong PVC layer.
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If the copper wires get damaged, the connection may become slow or stop working.
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Pets like cats and dogs often chew on cables, and young children may pull on them out of curiosity. Keep cables away from their reach to prevent damage.
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If your Ethernet cables run outside, under the house, or in the attic, inspect them for any signs of wear.
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Just like phones and TV cables, they can be affected by the environment or accidents. A small cut from a tool or a rodent bite can slow down your connection.
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Check the Cable’s Connectors
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Each Ethernet cable has RJ45 connectors at both ends. These connectors contain eight contacts that align with those inside an Ethernet port.
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If the contacts are dirty, rusted, or damaged, the connection will not be stable, leading to slower speeds.
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Why Do Some Ethernet Cables Have Gold?
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Some Ethernet cables contain gold to prevent corrosion and improve electrical conductivity. Consider this factor when selecting a new Ethernet cable.
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A small clip on the connector locks it into the Ethernet port. A broken clip can cause the connector to shift, creating a loose connection.
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A loose connection can lower internet speed or disconnect the cable.
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Check Your Ethernet Port Type
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Most modern devices use one of five Ethernet port types: Fast Ethernet, Gigabit Ethernet, 2.5 Gigabit Ethernet, 5 Gigabit Ethernet, and 10 Gigabit Ethernet.
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Gigabit Ethernet is the most common port in computers, gaming consoles, media devices, routers, modems, and gateways.
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However, with faster internet services becoming popular, 2.5 Gigabit Ethernet is now more common in modems, routers, and gateways.
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A 5 Gigabit Ethernet port is uncommon. However, 10 Gigabit Ethernet is standard in fiber links, gateways, and modern Wi-Fi 7 routers like the NETGEAR Nighthawk RS700S.
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| Type | Technical Name | Maximum Speed | Actual Speed |
| Ethernet | 10BASE-T (10MbE) | 10 Mbps | 9.4 Mbps |
| Fast Ethernet | 100BASE-T (100MbE) | 100 Mbps | 94 Mbps |
| Gigabit Ethernet | 1000BASE-T (1GbE) | 1,000 Mbps (1 Gbps) | 940 Mbps |
| 2.5 Gigabit Ethernet | 2.5GBASE-T (2.5GbE) | 2,500 Mbps (2.5 Gbps) | 2,350 Mbps |
| 5 Gigabit Ethernet | 5GBASE-T (5GbE) | 5,000 Mbps (5 Gbps) | 4,700 Mbps |
| 10 Gigabit Ethernet | 10GBASE-T (10GbE) | 10,000 Mbps (10 Gbps) | 9,400 Mbps |
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You’ll never get the highest speed of a port because network overhead takes up bandwidth. Network overhead includes data that helps transfer your information.
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I use 6% as an estimate for actual speeds, but the percentage changes depending on the transfer protocol. It may be higher or lower.
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Ethernet ports and cables work together. If you connect a CAT 6 cable to a Gigabit Ethernet port, you will likely get around 940Mbps, up to 980Mbps if lucky.
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If you connect the same cable to a 2.5 Gigabit Ethernet port, the speed remains around 940Mbps because the cable becomes the limitation.
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A CAT 6a cable or newer works best for multi-gig ports.
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A device with a Fast Ethernet port has a speed limit, but you can bypass it with a USB-to-Ethernet adapter that supports gigabit speeds.
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A USB-A 2.0 port allows up to 480Mbps, better than Fast Ethernet. However, a USB-A 3.x or USB-C 3.x port is better since it supports 5Gbps or 10Gbps, depending on the setup.
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Always check your Ethernet ports, as they impact connections with devices and the internet. A CAT 6a cable will not give you 10Gbps if the port only supports 1Gbps.
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What Type of USB Port Do You Have?
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Computers usually have two types of USB ports. The “A” port is rectangular, older, and more common.
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USB 2.0 ports are black and have a pitchfork-like symbol. USB 3.x ports are blue and have an SS pitchfork symbol.
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The “C” port is minor and oval and supports 5 Gbps or more speeds, depending on the hardware inside.
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Try Another Ethernet Port
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If you use Ethernet on a PC, console, or streaming device, switch the cable to a different port on the router or gateway.
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Most routers have at least four ports, and the one you use might not work correctly.
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A broken Ethernet port may slow down or stop the connection. Plugging the cable into a different port helps determine if the problem is with the port, cable, or internet.
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If the new port works well, the old one is probably faulty. Put tape over the lousy port to prevent future use.
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You may have to switch to Wi-Fi if your device has limited Ethernet ports. If the problem continues, contact the manufacturer for support.
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Review Your Network Settings
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Log into your router or gateway and check if a wired device is blocked or has a speed limit. The issue may not be with the cable or port but with a setting restricting the connection.
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Routers and gateways often have Quality of Service (QoS) settings, prioritizing specific devices and internet traffic.
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If the router gives more bandwidth to a gaming device, other devices might experience slow speeds.
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Inspect Your Ethernet Switch
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If you use multiple Ethernet connections at home or work, you might have an Ethernet switch.
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These devices send data between wired connections and are helpful if you prefer wired internet over Wi-Fi.
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Like computers, Ethernet switches sometimes need a restart to fix software or hardware issues.
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Unplugging and reconnecting the power can clear minor problems. If speed issues continue and you’re sure the switch is causing them, replacing it may be necessary.
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Looking for a New Ethernet Switch?
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The Linksys SE3008 is a good choice for gigabit speeds. There are also models designed for gamers and those who need Power over Ethernet (PoE).
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Restart and Update Your Devices
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A hardware or software problem might slow down your Ethernet. Restart your device to fix the issue.
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Keep your devices updated by installing all system updates and drivers.
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A network driver, which helps the system communicate with hardware, can cause slow speeds or disconnections if outdated.
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Companies release new drivers regularly to improve performance and fix issues. Keeping them updated is essential.
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Call Your Internet Provider
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Many modems and fiber network terminals (ONT) use Ethernet to connect to a Wi-Fi router.
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If replacing the Ethernet cable between them does not fix the speed problem, the Ethernet port on the modem or ONT might be faulty.
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The modem or ONT itself could also be failing. Contact your provider if nothing else solves the issue.
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Some Ethernet issues at home or work may need professional repair.
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Fiber services often use Ethernet cables inside walls connected to wall jacks. A damaged cable or port may require a technician to fix. it
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How to Make Ethernet Faster?
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Ethernet components cannot run faster than their design, but better hardware and cables can improve a wired network.
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Home network speed depends on two factors: Ethernet ports and Ethernet cables. Both must match, or one will slow down the other.
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For example, an internet plan with 1,000Mbps will reach about 940Mbps on a modem with a Gigabit Ethernet port.
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A modem with a 2.5 Gigabit Ethernet port will provide the full 1,000Mbps.
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Routers and wired devices follow the same rule. Gigabit Ethernet devices will not benefit from CAT 6a or newer cables—link aggregation works similarly, combining two Gigabit Ethernet ports to create a 2Gbps connection.
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Multigig Ethernet ports require CAT 6a or newer cables. Upgrading Ethernet switch boxes also helps if they are part of the network.
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Many models now offer 2.5 Gigabit Ethernet ports, but they still cost more than Gigabit Ethernet models.
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