No, the router or the client's network card cannot restrict the duration of running an Ethernet cable.
No, the router or the client's network card cannot restrict the duration of running an Ethernet cable.
In regular network setups, most devices agree the signal stays strong up to about 100 meters. Currently this means Gigabit speeds on Cat5e or better cables. For 10Gbps you’ll need different cable types. The range changes based on the cable type—Cat6 supports roughly 50 meters, while Cat6a can reach up to 100 meters. Things become more tricky with PoE or Power over Ethernet, as each has its own distance constraints.
Ethernet can reliably reach up to 100 meters. However, many modern network cards include "power saving" or "green" modes that automatically lower transmission power when the cable is short and losses are minimal. This generally functions effectively most of the time. The issue arises with inexpensive cables labeled CCA or "copper clad aluminum," which use a thinner copper layer over aluminum instead of solid copper. These wires have increased resistance, making them less suitable for longer distances. Combined with reduced power transmission from network cards, this can lead to signal degradation and errors. If you're using such cables, check Device Manager, disable any power-saving settings, and let the card operate at full power—typically adding only a small amount of extra consumption.