FTTH fiber or coaxial cable: what's the difference, and which should you choose in Belgium in 2026?

"Fiber": the word is on every brochure, but it covers two very different technologies. On one side, optical fiber pulled all the way into your home. On the other, a cable network that is only fiber up to the end of the street, then falls back to copper coax — while also branding itself as "fiber." To choose an internet plan in Belgium in 2026, you first need to know which of the two actually reaches you, and whether the difference matters for how you use the connection. Here is what really separates FTTH from coaxial cable, without needless jargon. Figures recorded in July 2026.

What is the difference between FTTH fiber and coaxial cable?

The difference lies in the final stretch, the one that enters your home. FTTH fiber (Fiber To The Home) brings an optical glass cable straight into the home over a line that belongs to you. Coaxial cable relies on a so-called HFC network (hybrid fiber-coaxial): fiber runs up to a neighborhood cabinet, then a copper coaxial cable — the same one that used to carry cable TV — covers the final metres to homes, pooling its capacity between neighbors.

This architecture explains everything else. FTTH, dedicated and fully optical, carries light with no sharing and no meaningful signal loss. Cable stays excellent for downloads but drags along the legacy of a network built to broadcast television, not to send data back up to the internet. In Belgium, cable is the network of Telenet in Flanders and of the former VOO, acquired by Orange, in Wallonia and Brussels. FTTH is carried by Proximus (and the operators that rent its network, such as Orange) and by infrastructure players like Wyre and Fiberklaar.

Is FTTH fiber really faster than cable in Belgium?

For downloads, not necessarily. Here is the counter-intuitive part: the DOCSIS 3.1 cable deployed today reaches about 1 Gbps down, plenty to run an entire household. FTTH climbs higher — 2.5, 5, even 10 Gbps on some plans — but most home devices cannot exploit such speeds. On the download figure alone, the gap is therefore often theoretical.

FTTH's real edge shows on three criteria advertising rarely highlights: upload, latency and stability at peak hours. These are what make the difference in daily use, far more than the big gigabit number. To place the plans against one another beyond technology alone, lean on our ranking of the best fiber internet plans in Belgium.

Why is upload the real weak point of cable?

Because the coaxial network was built to send a signal down, not up. It originally distributed television: all the bandwidth flowed to the subscriber. The return path, the one that sends your data up to the internet, has far less capacity. The concrete result: a cable plan advertising 1 Gbps down often caps uploads around 40 to 50 Mbps on consumer tiers.

FTTH, by contrast, is symmetric: the same speed both ways. On a 1 Gbps fiber plan, you upload at 1 Gbps. This gap is invisible as long as you only consume content, and becomes decisive as soon as you produce it: crisp, uninterrupted video calls, fast cloud backups, sending large files, live streaming on Twitch or YouTube. That is precisely why FTTH stands out for intensive remote work, where the upstream channel works as hard as the downstream.

Does cable slow down at peak hours?

It can, because coaxial cable shares its capacity among the subscribers of the same neighborhood segment. When the whole street connects on a Sunday evening, the available speed is split between active homes: cable's historic flaw. The DOCSIS 3.1 standard and the operators' continual capacity additions have greatly eased this, to the point most subscribers no longer notice it in typical use.

FTTH has no such sharing on the final stretch: each home has its own optical line to the exchange. The result shows mainly in consistency — fewer swings by the hour, lower and steadier latency. For latency-sensitive uses such as competitive online gaming, that stability matters more than raw speed, as our guide to the best fiber for gaming explains.

"Fiber" on the brochure: is it always true FTTH?

No, and it is the most common misunderstanding on the Belgian market. Several plans sold with the word "fiber" actually run on an HFC network whose final stretch is still coaxial cable. The fiber then stops in the street, at the cabinet, not in your living room. It is not a lie — there is fiber in the chain — but it is not FTTH, and the properties that matter (symmetric upload, dedicated line) do not follow.

The only way to know what you are buying is to check FTTH eligibility for your exact address, house number included, rather than trusting the plan's commercial name.

Fiber or cable: which should you choose for your usage?

The answer depends on what you do with your connection, not on the biggest number. Here is how to decide.

If you mostly stream and browse — 4K series, social media, browsing, a little occasional gaming — cable does the job perfectly. Its 1 Gbps download covers all those uses, and the limited upload will never get in your way. No need to pay more for FTTH you will not exploit.

If you work from home, create or send a lot — daily video calls, cloud, large files, live streaming — FTTH genuinely changes the experience thanks to its symmetric upload and lower latency. It is also the better choice for a household where two adults work from home on video calls at the same time.

Between the two, two criteria often decide before the technology does: the price after the promo — the real cost, not the six-month teaser rate — and real eligibility at your address. There is no point dreaming of symmetric FTTH if only the cable plan is available on your street.

Where does FTTH fiber rollout stand in Belgium in 2026?

Coverage is growing fast, but remains very uneven from one street to the next. By the end of 2025, Proximus reported around 2.6 million homes and businesses able to connect to its fiber, close to 42% of the population, with a target of 95% of homes by 2032. In Wallonia, the agreement between Orange and Proximus aims to cover roughly 70% of homes with FTTH. In Flanders, infrastructure players Wyre and Fiberklaar, alongside Telenet, are accelerating connections, with Telenet having begun a gradual shift from its cable network to fiber.

Meanwhile, cable is not going away: where FTTH is uneconomic to deploy, operators are upgrading the coax to DOCSIS 4.0, a standard that promises up to 10 Gbps down and several Gbps up. Enough to bring cable closer to fiber's performance in time — but that shift will take years. Until then, the right reflex stays the same: check what actually reaches your address before you choose.

In short, the difference between FTTH and cable is not read on the big download number, but on upload, latency and stability — three criteria cable partly offsets without matching. True FTTH fiber wins for anyone who works, creates or games; cable is enough for anyone who streams. Check first what is available where you live, read the price of the thirteenth month before the first, and set the commercial name aside: what counts is what actually enters your living room.