How far can copper Ethernet run?

100 meters, about 328 feet, per run for Cat6 and Cat6A. Beyond that the signal degrades. Fiber runs for kilometers, so a shop, a gate or a second building is a straightforward link.

Less than people expect. The glass strand is wrapped in aramid fiber and a polymer jacket, weighs about 30 percent less than copper, and pulls well through conduit. Tight bends are the one thing to avoid.

Does fiber replace all the copper in a house?

No. Cameras, access points, intercoms and touch panels are powered over copper (PoE). Fiber carries the data backbone; copper carries power to the devices at the end.

Do I need fiber for a normal home?

For a single-story house with short runs, Cat6A is enough. Fiber earns its place on long runs, between buildings, for multi-gig service, and in new construction where the cost of pulling it now is low.

Fiber vs Copper for Home and Business Networks

When should your network run on fiber instead of copper?

Copper Ethernet has carried building networks for decades and is reaching its limits on long runs and multi-gig speeds. This guide explains what fiber does better and where copper still belongs.

Run fiber where the cable is long, the speed is multi-gig or electrical noise is present. Fiber loses less signal, carries more bandwidth, runs farther, ignores interference and does not corrode. Copper still belongs on short runs and PoE devices, and Rivas Technology Group designs South Sound networks with both.

By Ivan Rivas, Owner and Sales Engineer · 2023-11-30 · Updated 2026-09-17

Commercial network rack and cabling installed by Rivas Technology Group

Why does fiber carry a signal farther than copper?

Lower attenuation. Attenuation is signal loss over distance, measured in decibels. Copper is a good conductor but not a perfect one, and resistance eats the signal as the run gets longer. Fiber carries light through glass, and its losses come from scattering, absorption and bending rather than resistance. A typical fiber run loses a fraction of a decibel per kilometer; copper Ethernet is specified to 100 meters (328 feet) per run and degrades past that. That is why fiber links buildings and copper links rooms.

How much more bandwidth does fiber carry?

Far more, over far longer distances. Copper category cabling supports its rated bandwidth up to 100 meters. A fiber link carries the same bandwidth for a kilometer, and higher bandwidths over shorter runs, which is why 10 Gbps and faster links in a building are fiber. In a home this matters when internet service passes 1 Gbps or when a rack feeds a theater with 8K video. It also matters when several 4K streams, cameras and a work-from-home connection run at once.

What is fiber like to install?

Lighter and thinner than copper, with one rule: respect the bend radius. Fiber cable weighs about 30 percent less than copper, has a thin diameter, and pulls well through long conduit runs because of the aramid yarn around the glass. A copper bundle of six Cat6A runs is heavy and stiff; one fiber strand replaces it. What fiber does not tolerate is a sharp bend. We have replaced ISP fiber that was kinked at the service entrance and was losing signal for exactly that reason.

Why does fiber ignore electrical noise?

Because it is not a conductor. Copper picks up interference from nearby power lines, motors and other data cables (crosstalk). Fiber carries light, so it can run alongside power in the same trench or chase without noise, and it does not carry a lightning surge from one building to another. That makes it the right link between a house and a shop, between floors of an office, and anywhere the cable path is shared with electrical.

Does fiber corrode?

No. Copper oxidizes over time, the way a penny turns green, and corroded copper conducts worse until the run fails. Glass does not oxidize, which is why fiber is the backbone of campuses, data centers and coastal buildings that see salt air and weather. A fiber run pulled at construction is still good decades later.

Where does copper still belong?

At the device. Cameras, access points, video intercoms, touch panels and Control4 controllers take power over Ethernet, and PoE runs on copper. Our standard design is a hybrid: fiber for the backbone and long runs, Cat6A for every PoE device, both terminated in one rack. In a new home we pull a fiber to each room through IFP Connect fiber switching and modules that present ordinary Ethernet ports at the wall. The design is on the fiber to the jack page, and the Tacoma version is in fiber to the jack in Tacoma.

What drives the cost?

Run count and length, conduit, terminations and whether the walls are open. Fiber terminations cost more per end than copper jacks and need the right tools, so a small single-story house with short runs is usually Cat6A throughout. Fiber wins on long runs, between buildings, on multi-gig service and in new construction, where the cost of pulling it before drywall is small. The instant quote gives a range; a site survey gives a fixed proposal.

Need it installed?

Rivas Technology Group designs and installs structured cabling, fiber and Wi-Fi for homes and businesses from Kent across south King County and Pierce County, under WA electrical contractor license RIVASGL799DR. Start on the fiber to the jack page or the Wi-Fi and networking page, or book a site survey below.