<section> <div class="wrap"> <h2>The short answer</h2> <p> Fiber optic internet sends your data as pulses of light down a strand of glass about the width of a human hair. Everything else in consumer broadband sends it as electricity down metal: copper telephone pairs for DSL, coaxial cable for cable internet. </p> <p> That single difference is where every practical advantage comes from. Light in glass does not weaken over distance the way a signal in metal does, it does not pick up electrical interference from your neighbors, and the glass itself is nowhere near its capacity limit. When a fiber provider raises your speed, they usually change equipment at the two ends and leave the glass alone. </p> <p class="notice"> <strong>The catch is not technical.</strong> Fiber is better on almost every measure that matters, and roughly four in five US residential locations still have at most one company offering it, because it was built out street by street over decades. Which is why the useful question is not whether fiber is good. It is whether it reaches your building. </p> </div> </section> <section> <div class="wrap"> <h2>The words on your bill, decoded</h2> <p> The physics is short and we have written it up separately in <a href="/guides/how-does-fiber-internet-work/">how does fiber internet work</a>. What that page does not cover, and what actually decides whether the thing you are being sold is real fiber, is the vocabulary. </p> <table> <thead> <tr><th>Term</th><th>What it means for you</th></tr> </thead> <tbody> <tr> <td><strong>FTTH / FTTP</strong><br>fiber to the home or premises</td> <td>Glass all the way to your building. This is the real thing, and the only one that delivers everything fiber is sold on.</td> </tr> <tr> <td><strong>FTTC / FTTN</strong><br>fiber to the curb or node</td> <td>Glass to a cabinet in your street, then the existing copper for the last stretch. Better than plain DSL, nowhere near FTTH, and frequently marketed using the word fiber.</td> </tr> <tr> <td><strong>ONT</strong><br>optical network terminal</td> <td>The box where the glass stops and ordinary Ethernet begins. The fiber equivalent of a modem. Usually provider owned, needs power, and usually a permanent fixture on a wall.</td> </tr> <tr> <td><strong>PON</strong><br>passive optical network</td> <td>The shared distribution design most homes get. One strand from the exchange is split between roughly sixteen to thirty two homes using no powered equipment in the street, which is why there is less to fail in a storm.</td> </tr> </tbody> </table> <p class="notice"> <strong>The one that costs people money.</strong> If a provider will not write FTTH or FTTP down, assume there is still copper in the path. The word "fiber" on its own is not a commitment, and FTTC services are routinely sold as fiber. </p> </div> </section> <section> <div class="wrap"> <h2>What installation involves</h2> <p> If fiber already runs past your building, installation is a technician visit of roughly two to four hours. They run a drop cable from the street or a nearby pole to an entry point, fit an outside box, drill a small hole, mount the ONT inside, and connect your router. In an apartment, the glass usually already reaches a communications room and the work is shorter. </p> <p> If fiber does <em>not</em> run past your building, no appointment will fix that. Extending a fiber route to one address is civil engineering work, costing thousands and requiring permits, and providers do it on their own build schedule rather than on request. This is the single most common reason a coverage map disagrees with the answer you get on the phone. </p> <p> Two things worth knowing before the technician arrives. The ONT needs power and it is usually a permanent fixture, so think about where you want it. And your existing router may or may not be reusable, because fiber plans frequently exceed what an older router can pass. </p> </div> </section> <section> <div class="wrap"> <h2>How to find out whether it reaches you</h2> <p> Coverage maps published at state or county level cannot answer this, and the reason is structural rather than sloppy. Fiber was built street by street, so a county containing one fiber-served town reads as covered, and so does the rest of it. Nationally, up to one in nine residential locations sits in a census block where fiber exists and does not reach the building. </p> <p> The only useful check is at an address. Ours reads the FCC's own filing at the census block your building sits in and shows every operator that reports service there, not one company's version of it. </p> <p class="hero-cta"> <a class="btn" href="/check-my-address/">Check what reaches your address &rarr;</a> </p> <p class="muted"> Providers self-report this data to the FCC and it is known to overstate coverage. If a provider tells you they cannot serve you, they are right and the filing is wrong. </p> <p> Related: <a href="/guides/fiber-vs-cable/">fiber vs cable</a> if you have both and are choosing &middot; <a href="/fiber/">every fiber provider we cover</a> &middot; <a href="/research/us-broadband-competition/">how much fiber choice Americans actually have</a> </p> </div> </section>