When people talk about "fibre internet," they mean a connection delivered over fibre optic cables rather than copper wire or coaxial cable. It's the gold standard for business internet — and understanding why helps you evaluate your current connection and make a more informed decision about whether upgrading makes sense for your premises.
What is fibre optic cabling?
Fibre optic cables carry data as pulses of light through extremely thin strands of glass or plastic — each strand thinner than a human hair. The light travels along the inside of each strand using a principle called total internal reflection: the light bounces off the inner surface of the fibre at an angle that keeps it contained and moving forward, rather than escaping out the side.
This allows data to travel at extraordinary speeds over very long distances, with minimal signal loss along the way. A fibre signal doesn't degrade meaningfully over kilometres — it arrives at the other end with essentially the same integrity it had when it left.
Copper cable, by contrast, carries electrical signals. Electrical signals degrade with distance — the longer the run, the weaker the signal becomes. They're also susceptible to interference from nearby electrical sources, temperature changes, and physical deterioration of the cable itself. This isn't a problem in a short run, but in a connection spanning hundreds of metres or kilometres (which is what your internet connection involves), those limitations become significant.
Why fibre is better than copper for business
The practical advantages of fibre over copper come down to three things that matter directly to business operations.
Speed potential. Copper connections have a practical ceiling. For most copper-based NBN connections (FTTN), real-world download speeds top out at around 50–80 Mbps, well below the theoretical maximum. Fibre connections can deliver multiple gigabits — and the technology supports far higher speeds than current consumer services even use. The ceiling on fibre is effectively beyond what any business currently needs.
Consistency. Copper performance isn't just limited — it's variable. The speed and reliability of a copper connection depends on how far you are from the nearest street node, the age and condition of the cable, weather conditions, and electrical interference from surrounding infrastructure. A fibre connection doesn't have these dependencies. The performance you get on a clear Tuesday is the same as what you get on a wet Friday. That predictability matters for businesses running voice, video, and cloud-critical applications where inconsistency creates real problems.
Symmetry. Most copper-based internet connections are inherently asymmetric — download speeds are far higher than upload speeds, because the technology was originally designed for consumers who mostly receive data rather than send it. Fibre connections can be configured with genuinely symmetric speeds, meaning equal upload and download capacity. For a business on video calls all day, syncing large files to cloud storage, using VoIP phones, or running hosted services, upload speed matters as much as download. Fibre makes symmetry practical in a way copper simply can't.
The different kinds of fibre in the NBN
Not all connections marketed as "NBN" deliver the same fibre experience. The NBN uses several different technologies depending on when your area was rolled out and what infrastructure was available.
FTTP (Fibre to the Premises) is the genuine article — fibre optic cable running all the way into your building. A small connection device called an ONT (Optical Network Terminal) is installed on an interior wall, and your router connects to it. Every limitation associated with copper doesn't apply here. This is the connection type that supports NBN speeds up to 2,000 Mbps and delivers the most consistent performance.
FTTN (Fibre to the Node) runs fibre to a green street cabinet, then uses existing copper telephone wiring for the final stretch to your building. That copper segment is where performance limitations originate. Depending on how far you are from the node, real-world speeds can be significantly lower than what an NBN plan advertises.
FTTC (Fibre to the Curb) is a middle ground — fibre runs to a small pit immediately outside your building, then a very short copper segment (just a few metres) completes the connection. Because the copper run is so short, performance degradation is minimal, and speeds approach what FTTP delivers.
HFC (Hybrid Fibre Coaxial) runs fibre to a node in the street, then uses the existing pay-TV coaxial cable network to reach your building. The coaxial segment is shared capacity, which can cause peak-hour performance variation, but HFC can support high-speed plans including NBN 1000.
If you're currently on FTTN or FTTC, your premises may be eligible for a free upgrade to full FTTP. This is worth investigating — the performance improvement is significant and the process is less disruptive than most businesses expect. See our FTTP upgrade page for details.
When should a business consider dedicated fibre?
For most Adelaide businesses, Business NBN on FTTP delivers excellent performance at an accessible price point. But for larger organisations, businesses with very high bandwidth requirements, or operations where shared infrastructure introduces unacceptable risk, dedicated carrier fibre offers something NBN can't: guaranteed symmetric bandwidth with a contractual SLA that operates entirely independently of the NBN network.
Dedicated fibre isn't a shared service — it's a circuit provisioned exclusively for your premises, with committed information rates rather than best-effort speeds. It costs more, but it delivers a level of reliability and performance certainty that makes it the right choice for certain business environments. Our dedicated fibre page covers this in more detail.
If you're unsure what type of connection serves your premises, or you want to know whether an upgrade to FTTP or dedicated fibre makes sense for your business, contact our team. We can check your address and give you a straight answer in a few minutes.