How to improve your business internet speed on the fibre you already pay for
Most offices leave speed on the table long after the fibre is installed. The fixes are rarely a faster package; they are the router, the wiring, the traffic rules and a plan for power. Here is how to get every megabit you are paying for.
How do I improve my business internet speed with fibre?
Match the package to your real usage with 20 to 30% headroom, then fix your own network: a business-grade router with quality-of-service, wired connections for fixed devices, and traffic rules that put VoIP and video first. Add a UPS and a failover line so a power dip does not take you offline.
What fibre speed does your business actually need?
Buying more speed than you use is a waste; buying too little throttles every call. Size it to your team and applications, then add a growth buffer.
Most small businesses (1 to 10 users) run comfortably on 10 to 20 Mbps. Mid-sized operations (10 to 50 users) typically want 50 to 100 Mbps, and larger teams or those running video production, heavy cloud apps or big data transfers need 200 Mbps or more. South African fibre packages now span 2 Mbps to 1 Gbps, though what you can get depends on the network at your address.
The number most businesses get wrong is upload. Consumer packages are asymmetrical, fast down, slow up. But cloud backups, video conferencing and VoIP all lean on upload. Aim for upload at least 50% of your download, and closer to symmetrical if the budget allows. A team of five on video calls needs roughly 2 to 3 Mbps per person in each direction, plus headroom for everything else.
How to choose the right fibre package
Four dimensions decide whether a package performs: speed tier, contention ratio, data policy and the SLA. Price alone tells you almost nothing.
Contention ratio is the one most buyers never ask about. It measures how many users share the same upstream capacity. A 20:1 ratio means you share with 19 other businesses, and at peak hours your speed can sag. Premium business lines offer 5:1 or lower, and fibre-to-the-premises usually beats fibre-to-the-cabinet on contention.
Data policy still matters here despite fibre’s capacity. Some business packages are truly uncapped; others apply a fair-use threshold. If you back up large datasets, stream, or run video surveillance, an uncapped or unshaped business line is worth the small premium.
The SLA is your safety net: it defines guaranteed uptime (for example 99.5%), a fault-response window (often 4 hours) and sometimes credits when performance drops. A cheap line without an SLA gets expensive the first time it goes down during business hours.
| Package type | Typical speed | Contention |
|---|---|---|
| Consumer fibre | 10–100 Mbps | 20:1 to 50:1 |
| Business fibre | 50–200 Mbps | 10:1 to 20:1 |
| Enterprise fibre | 200 Mbps–1 Gbps | 1:1 to 5:1 |
The hardware fixes that unlock your line
Your ISP’s connection is only as fast as your own network allows. This is where most offices quietly lose a third of their speed.
Upgrade the router. The free box bundled with a fibre line prioritises cost over performance and often lacks proper quality-of-service. A business-grade router (vendors like Ubiquiti, MikroTik and Draytek are common choices) gives you traffic prioritisation, dual or tri-band radios to cut congestion, gigabit ethernet, WiFi 6 for the long term, a real firewall and a management dashboard.
Wire what stays put. Desktops, printers and security systems belong on Gigabit ethernet (Cat6 or Cat6A). Wireless is convenient but slower and prone to interference, so reserve it for laptops and phones.
Segment the network. Put guest WiFi on its own VLAN so visitors cannot eat your business bandwidth, and separate departments or priority levels where it helps. For coverage across a larger floor, a mesh or multi-access-point setup beats one router straining to reach the boardroom.
Where your speed actually goes: the line vs your network
A faster package fixes nothing if a single large download can still starve the whole office. Traffic rules, not more megabits, protect your calls.
WhichVoIP editorial view
How to set QoS so calls always come first
Quality of Service is the art of sending bandwidth where it matters. Without it, one person downloading a large file can tank everyone’s VoIP quality.
How to monitor and troubleshoot slow speeds
Ongoing monitoring catches degradation before your team complains. Establish a baseline, then look for trends.
Run a speed test weekly at the same time of day using a reputable tool such as Speedtest.net (Ookla) or a South African-hosted tester that measures within local infrastructure. Record the results. If speeds consistently sit 20% below your contracted rate, that history is your evidence when you call the provider.
| Symptom | Likely cause | First move |
|---|---|---|
| Slow on every device, wired and wireless, same time daily | ISP-side or contention | Log it, raise with provider |
| Only WiFi slow; ethernet fine | Router or interference | Reposition or replace router |
| Everything slow after an outage | Session stuck | Power-cycle modem + router |
To isolate the problem, plug a laptop straight into the modem by ethernet. If wired speed is normal but WiFi is not, your router needs repositioning, reconfiguration or replacement rather than an ISP call.
Keeping the connection up when the power drops
Fibre itself carries light, not electricity, so the cable is fine during an outage. The equipment that turns that light into internet is not, and that is what you plan for.
Our verdict
Faster fibre is the last lever to pull, not the first. Right-size the package with headroom, insist on a sensible contention ratio and an SLA, then invest the real effort in your own network: a proper router, wired connections where they count, QoS that protects voice, and a UPS-plus-failover plan for power. Do that and the line you already pay for will perform like a faster one.
Outgrown your current fibre line?
Compare business fibre packages on speed, contention and SLA, and get quotes matched to your team size.
Frequently asked questions
Why is my fibre slower than the speed I pay for?
What upload speed does a business need on fibre?
What is a contention ratio and why does it matter?
How do I keep VoIP calls clear when the office is busy?
How do I keep internet running during load shedding?
Should I upgrade my package or my hardware first?
Keep reading
Sources: WhichVoIP editorial guidance on South African business fibre; Ookla Speedtest methodology for baseline testing. Speed, contention and SLA figures are typical 2026 SA market ranges, not a single provider’s package. Verified 14 July 2026.