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Why fiber is the road, and 5G rides on top of it
Every new access technology 'will replace fiber.' Why, in practice, 5G and FTTH complement each other — they don't compete.
Every time a new access technology shows up, the same headline returns: "this will replace fiber." I've seen that prediction about several generations of radio, and to this day it hasn't come true. With 5G — and with FWA, fixed access over 5G — it's no different. It's worth separating enthusiasm from structure.
I'll start with the point almost no one likes to remember: 5G depends on fiber. To deliver the speed and capacity it promises, each antenna needs fiber behind it, in the backhaul. In other words, the more 5G a country wants, the more fiber it will have to bury. At that layer, the two technologies don't compete — one sustains the other.
Where they do meet is in access to the end customer. And there each has its place:
- FWA (fixed 5G) is strong on flexibility. Where running fiber is expensive or unfeasible — rural areas, low density, difficult terrain — it delivers decent broadband without street works. It's the right tool to reach those whom fiber would take years to serve.
- FTTH (fiber) wins on capacity, latency and stability. For those who use the connection intensively and critically, it's another level of reliability — and it has practically unlimited capacity, because what evolves is the equipment at the ends, not the cable.
That's why I don't believe in replacement, but in complementarity. The balance between the two will vary with geography, density and demand. In a country the size of Brazil, with the inequalities it has, it makes little sense to choose just one.
The real challenges, in the end, aren't about technology — they're about execution: the cost of deploying at continental scale, regulation that changes from municipality to municipality, recovering the investment in low-income regions. Whoever solves that isn't the one with the prettiest slide about 5G. It's the one who knows how to build and operate networks on the ground, year after year.
Fiber isn't the past that 5G comes to retire. It's the road on which 5G — and whatever comes after it — will ride.