5G vs Fixed Wireless for Business Internet: Choosing the Right Link

Australia's geography makes universal fibre coverage impractical. Outside of the NBN fibre-to-the-premises footprint, businesses in regional towns, industrial estates, and new developments often face months of lead time and significant build costs to get a wired connection. Even in metro areas, a second tenancy in a multi-storey building may find the only available NBN technology is fixed wireless or satellite. Wireless broadband — whether delivered by 4G, 5G, or dedicated fixed-wireless infrastructure — provides an alternative that can be provisioned in days rather than months.

For IT resellers, understanding the trade-offs is essential when scoping a customer's WAN design. Recommending the wrong technology can lead to complaints about video-call dropouts, VPN instability, or unexpectedly high monthly bills. The three primary contenders in the Australian market today are 5G Fixed Wireless Access (FWA), NBN Fixed Wireless, and of course fibre where it is available. Each has distinct performance characteristics, contention models, and pricing structures that resellers must be able to articulate.

5G FWA uses the mobile carriers' 5G radio network to deliver broadband to a fixed location, typically via an outdoor CPE (customer premises equipment) unit or a window-mounted modem. In Australia, Telstra, Optus, and TPG/Vodafone all offer 5G FWA plans aimed at both residential and business customers. The key advantage is speed — 5G sub-6 GHz deployments commonly deliver 100 to 300 Mbps download, with millimetre-wave (mmWave) sites capable of exceeding 1 Gbps in ideal conditions. Upload speeds typically range from 20 to 50 Mbps, which is a significant improvement over many NBN tiers.

Latency on 5G FWA is generally between 10 and 30 milliseconds to the first hop, comparable to a good VDSL connection and significantly better than satellite. However, because the radio spectrum is shared with mobile phone users, performance can degrade during peak hours or at congested cell sites. Carriers manage this through traffic shaping and, in some cases, deprioritising FWA traffic relative to mobile handset users. For a business that relies on consistent throughput — for example, running hosted VoIP or real-time video conferencing — this variability is a genuine concern that must be tested on-site before committing.

NBN Fixed Wireless is a purpose-built broadband network operated by NBN Co using TD-LTE technology on licensed spectrum. It serves approximately 7 per cent of Australian premises, predominantly in regional and outer-suburban areas where deploying fibre was deemed too costly. The outdoor antenna connects to an NBN network termination device (NTD) inside the premises, and the customer then chooses a retail service provider (RSP) for their plan. Business-grade plans on NBN Fixed Wireless now support speeds up to 75/10 Mbps on standard tiers, with NBN Co progressively upgrading towers to support higher speed tiers through its fixed-wireless upgrade program.

One key difference between NBN Fixed Wireless and 5G FWA is contention management. NBN Co designs its fixed-wireless cells with a known subscriber base and provisions backhaul accordingly, whereas 5G FWA shares spectrum with a much larger and more variable pool of mobile users. In practice, this means NBN Fixed Wireless tends to deliver more consistent speeds during peak periods, although the absolute maximum throughput is lower than what 5G can achieve. Latency on NBN Fixed Wireless is typically 15 to 30 ms, which is acceptable for most business applications including VoIP and VPN.

Where available, fibre remains the preferred business broadband technology. NBN fibre-to-the-premises (FTTP) supports symmetrical speeds up to 1 Gbps on business plans, with latency under 5 ms to the first hop. Enterprise-grade fibre services from carriers like Telstra, Vocus, and Aussie Broadband offer committed information rates (CIRs), service-level agreements (SLAs) with uptime guarantees, and rapid fault restoration — features that wireless technologies simply cannot match. For businesses running on-premises servers, hosting public-facing services, or transferring large data sets, fibre's symmetrical bandwidth and low jitter are difficult to replace.

The downside is cost and lead time. Provisioning a new enterprise fibre service can take 30 to 90 business days and may involve construction charges running into thousands of dollars if the building lacks existing fibre infrastructure. For short-term leases, temporary sites, or businesses that cannot justify the upfront investment, wireless broadband becomes the pragmatic alternative.

Construction sites, agricultural operations, mining camps, and pop-up retail outlets share a common challenge: they need internet connectivity at locations where fixed-line infrastructure does not exist and may never be built. 5G FWA excels in this scenario because of its rapid deployment — a ruggedised outdoor CPE and a SIM card can have a site online within hours. Vendors such as Cradlepoint (now part of Ericsson) and Peplink offer industrial-grade 5G routers with dual-SIM failover, GPS tracking, and centralised cloud management, making them ideal for fleet and site deployments that resellers can manage as a service.

For regional sites outside 5G coverage, NBN Fixed Wireless or even 4G with external high-gain antennas may be the only viable option. Resellers should maintain a toolkit of Yagi and panel antennas, signal meters, and a selection of carrier SIMs to perform on-site assessments. In many cases, the difference between an unusable 5 Mbps connection and a workable 50 Mbps link is simply antenna placement and the correct carrier selection for that specific tower.

One of the strongest business cases for 5G and fixed wireless is as a secondary WAN link for automatic failover. If a customer's primary fibre connection goes down — whether due to a carrier outage, a damaged cable, or exchange equipment failure — a 4G/5G backup link can keep critical services running within seconds. Modern SD-WAN platforms from vendors like Fortinet, Cisco Meraki, and Peplink can monitor link health in real time and seamlessly switch traffic to the cellular backup, or even bond multiple links together for aggregated bandwidth during normal operation.

When designing a failover architecture, resellers should ensure the cellular link uses a different carrier and ideally a different physical path to the internet than the primary connection. Using Telstra fibre as the primary and a Telstra 5G SIM as the backup provides limited resilience if the issue is within Telstra's core network. A better design pairs Telstra fibre with an Optus or Vodafone 5G failover link. The SD-WAN device should also be configured to test reachability to meaningful endpoints — not just the default gateway — to detect partial outages that a simple ping might miss.

Australia's wireless broadband market is shaped by three mobile network operators — Telstra, Optus, and TPG Telecom (which operates the Vodafone, TPG, and iiNet brands) — plus NBN Co for the fixed-wireless network. Telstra has the widest 5G footprint, particularly in regional areas, and offers business-grade 5G FWA plans with static IP options. Optus has focused its 5G rollout on metro and suburban areas, with competitive pricing and unlimited data on some plans. TPG Telecom's 5G network is the smallest of the three but is expanding, and its plans are often the most affordable. Resellers should maintain relationships with all three carriers to ensure they can recommend the best option for each customer's location.

Beyond the big three, MVNOs (mobile virtual network operators) such as Aussie Broadband, Superloop, and SpinTel resell capacity on these networks, sometimes with more flexible contract terms or bundled services. For business customers, the choice between an MNO and an MVNO often comes down to support quality and SLA availability. MNOs typically offer dedicated business support teams and priority fault resolution, while MVNOs compete on price and may bundle wireless with NBN and voice services for simplified billing.

Latency is often more important than raw bandwidth for business applications. A VoIP call requires only 100 kbps of bandwidth but becomes unusable above 150 ms of round-trip latency. Similarly, remote desktop protocols like RDP and Citrix ICA are highly sensitive to latency — users notice sluggishness above 50 ms. 5G FWA and NBN Fixed Wireless both add radio-access latency that fibre avoids entirely. While 10 to 30 ms may sound small, it compounds with the latency to cloud-hosted servers, which for Australian businesses connecting to Sydney or Melbourne data centres might already be 10 to 40 ms depending on distance. A regional business on 5G FWA connecting to a Sydney-hosted application could easily see 60 to 80 ms total latency, which is workable but far from ideal.

For resellers advising business customers, the decision framework is straightforward. If fibre is available and the customer has a long-term lease, fibre should be the primary WAN link — the cost premium is justified by reliability, symmetrical speeds, and SLA coverage. If fibre is unavailable or the lead time is unacceptable, 5G FWA is the next best option where coverage exists, offering the highest speeds and lowest provisioning time. NBN Fixed Wireless fills the gap in areas without 5G coverage and offers more predictable performance than mobile-network-based solutions. In almost every scenario, a cellular backup link should be part of the design — the cost of a $50-per-month SIM plan is trivial compared to the cost of a full-day outage for a business.