One of the most frequently asked questions when choosing an Ethernet cable for home or office networks is whether cable length affects internet speed. Generally, Ethernet connections can operate without speed loss up to 100 meters when the appropriate cable is used. However, this limit is not the same for all cable types and connection speeds. So, which cable slows down how much?
Does Ethernet Cable Speed Drop with Length?
The 100-meter limit here does not refer solely to the cable running from wall to wall. In standard network installations, approximately 90 meters of permanent cable can be supplemented with up to 10 meters of flexible patch cable at both ends, totaling 100 meters. Therefore, the total distance is considered 100 meters. In daily use, a high-quality Ethernet cable of 3, 10, 25, or 30 meters is not expected to reduce connection speed.
Especially if your internet connection is at 1 Gbps, you might not experience issues even over much longer distances with the correct category cable. So, which Ethernet cable supports how many meters? Cable category becomes more important, especially for connections above 1 Gbps. Here, Cat6 forms a significant exception. Although Cat6 cables can support 10 Gbps connections, the standard distance for 10GBASE-T is limited to approximately 55 meters. If a 10 Gbps connection up to 100 meters is planned, Cat6a is a more suitable option.
- Cat5e: Up to 1 Gbps over 100 meters
- Cat6: Up to 1 Gbps over 100 meters
- Cat6: Up to 10 Gbps over approximately 55 meters
- Cat6a: Up to 10 Gbps over 100 meters
On the other hand, exceeding the specified cable length does not mean that speed will suddenly drop. For instance, a Cat6 cable slightly longer than 55 meters might still provide a 10 Gbps connection under suitable conditions. However, if you experience errors, connection drops, or performance fluctuations, switching to Cat6a would be more appropriate.
What to Do for Distances Longer Than 100 Meters?
If the distance between two network devices exceeds 100 meters, it might be more logical to place an Ethernet switch in between rather than using a single, very long copper Ethernet cable. This way, two separate cable lines can be created. Alternatively, fiber optic cables can be preferred for long distances. A media converter or a fiber-supported switch can be used to connect fiber and copper infrastructure.
For PoE (Power over Ethernet) connections, distance becomes even more critical. Although the 100-meter limit generally applies, power reaching devices can be insufficient in long cables. Therefore, in systems using PoE, the power requirements of both the cable and the switches and devices must be checked separately.
For those unaware, PPPoE connections are used in both VDSL and Fiber (FTTH) infrastructures. ISPs mandate this protocol in both technologies to authenticate your subscription and assign you an IP address. However, the method of establishing the connection may vary depending on your infrastructure.
In VDSL Infrastructure, PPPoE is established by connecting the telephone cable coming from the wall directly to the DSL modem. In Fiber (FTTH) Infrastructure, the thin fiber optic cable coming to the home is first connected to a small box called an ONT (Optical Network Terminal), and then to the modem with an Ethernet cable.
In conclusion, for a 1 Gbps connection, Cat5e or Cat6 is sufficient, and for a 10 Gbps connection up to 100 meters, Cat6a is adequate for most users. Purchasing higher-category Cat7 or Cat8 cables alone does not guarantee higher speeds; the router and computer's Ethernet ports must also support these speeds.
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