Businesses today have more connectivity options than ever — fixed-line NBN, 4G and 5G mobile broadband, and in genuinely remote locations, satellite services. Having more options is generally a good thing, but it also creates more room for confusion. The right combination for your Adelaide business isn't necessarily the fastest-sounding technology — it's the one that delivers consistent, reliable performance for how your team actually works day to day.
Fixed-line NBN — the workhorse
For virtually every Adelaide business, NBN is the right primary internet connection. It delivers consistent, high-speed internet over fixed infrastructure — whether that's fibre optic cable, copper, or coaxial cable depending on your premises — and that consistency is what makes it suitable for carrying business-critical workloads.
Unlike mobile broadband, NBN doesn't compete with the smartphone in your pocket for tower capacity. It doesn't fluctuate based on how many people in your suburb are streaming video on a Thursday evening. Speeds are predictable, latency is low, and Business-grade NBN plans come with a fault restoration SLA — meaning if your service goes down, your provider has a contractual obligation to restore it within a defined timeframe rather than just getting to it when they can.
Whether you have one staff member or a hundred, NBN — or in higher-demand scenarios, dedicated carrier fibre — is the right starting point for your connectivity stack. Everything else is built around it. See Caznet's Business NBN plans for speed tiers and inclusions.
4G and 5G — genuinely great backup, limited as primary
Mobile broadband works by transmitting data between a SIM-equipped device (a router or modem) and a nearby mobile tower. It's the same network your mobile phone uses, and in areas with strong coverage, the speeds can be impressive. 4G is well-established across Adelaide's suburbs and CBD. 5G coverage is expanding steadily, with theoretical peak speeds approaching 1 Gbps under ideal conditions.
Here's the practical reality for a business: real-world speeds on 4G and 5G vary considerably. Tower load at peak hours, the construction materials of your building, your distance from the nearest tower, and interference from surrounding structures all affect what you actually get. A 5G connection that delivers 400 Mbps at 9am on a quiet Monday might deliver 60 Mbps at 11am when everyone in the nearby office towers is on their phones simultaneously. That variability is the fundamental limitation of shared mobile infrastructure.
There's also the cost-per-gigabyte question. Mobile broadband data is significantly more expensive per GB than NBN at volume. Running 20 staff on mobile broadband as a primary connection is not a cost-effective approach, and data caps can become a real problem in a busy office environment.
Where 4G and 5G genuinely shine is as a failover connection. When your NBN service drops — due to a line fault, scheduled maintenance, or an unexpected outage — a 4G/5G backup link automatically takes over. Your EFTPOS terminals keep processing, your VoIP phones keep ringing, your cloud applications stay connected, and your team keeps working. The failover lasts until the NBN fault is resolved, then automatically switches back. Caznet can add 4G/5G failover to any Business NBN service — it's one of the most cost-effective resilience measures available to a small or medium business.
What about satellite internet?
Low Earth Orbit satellite services — Starlink being the most prominent — have genuinely changed the picture for remote connectivity. Unlike geostationary satellite (which had latency of 600ms or more due to the distance involved), LEO services like Starlink operate from satellites orbiting much closer to Earth, bringing latency down to 20–60ms and delivering usable speeds in the 100–200 Mbps range under reasonable conditions.
That said, satellite internet has characteristics that limit its usefulness for most business applications. Performance varies with weather — heavy rain and cloud cover can degrade the signal. Latency, while much improved over older satellite, is still higher than fixed-line NBN. The service is delivered via a dish mounted on the roof, which requires clear sky visibility and isn't always practical in dense commercial areas.
For an Adelaide CBD business, a suburban office with access to the NBN, or any premises where fixed-line connectivity is available, satellite doesn't make sense as a primary or backup connection. It's a tool for locations where nothing better exists — remote farms, mining operations, construction sites, vessels at sea. If you're in that situation, it's worth exploring. If you're in Adelaide with NBN access, it isn't the answer you're looking for.
Which should your business use?
The framework is straightforward once you understand what each technology is actually good for:
NBN as primary — choose a Business-grade plan rather than a residential one (the SLAs and support structures are meaningfully different). If your business is genuinely dependent on connectivity — financial services, medical, retail, professional services — select a plan with a fault restoration SLA. If you're on FTTN or FTTC and eligible for a free FTTP upgrade, take it.
4G/5G as failover — add this as a secondary connection that activates automatically. The monthly cost is low for the peace of mind it provides. Think of it as insurance for your connectivity.
Satellite only if nothing else is available — if you're operating in a genuinely remote location without fixed-line infrastructure, satellite may be your only viable option, and it's worth it in that context.
The one approach that doesn't work well: substituting mobile broadband for NBN as your primary connection to save money. You'll pay more per GB at volume, experience inconsistent speeds under load, and lack the SLA protection that comes with a business-grade fixed-line service. It's a false economy.
Not sure which combination makes sense for your premises? Call our team and we'll look at your address, your staff count, and your applications, and give you a straight recommendation.