ONT
Line device linked to the FNO or installation.
Fibre and Home Internet
Fibre ONT and Router Explained in South Africa
Many fibre homes have two devices: an ONT for the fibre line and a router for Wi-Fi. They are not the same thing.
Quick Answer
The ONT connects the fibre line to Ethernet. The router creates Wi-Fi and local network access. Both usually need power during load shedding.
Router
Wi-Fi device linked to the ISP package.
Power
Both usually need backup power to stay online.
ONT vs router
| Device | Purpose | What to ask |
|---|---|---|
| ONT | Converts fibre signal to Ethernet | Who owns it, can it be moved and what lights mean fault? |
| Router | Shares internet over Wi-Fi and Ethernet | Is it free-to-use, rented, owned or returnable? |
| UPS | Keeps devices powered | How many hours do you need for ONT and router together? |
Before replacing a router
- Check whether the ONT has power and normal status lights.
- Test Ethernet from router if Wi-Fi is weak.
- Restart ONT and router only if the provider does not warn against it.
- Ask the ISP whether the router is locked, leased or free-to-use.
- Do not move the fibre wall box or ONT without provider approval.
Sources checked for this guide
Reviewed by Riccardo Vallaro, Telecom & Mobile Services Specialist
Last reviewed: 20 June 2026
Sources we check: Afrihost fibre, Mweb Openserve fibre explainer. Price examples checked 20 June 2026; final fibre availability and pricing must be confirmed by exact address.
Why trust this: Guides are based on public operator pricing, USSD flows, official support pages, and South African prepaid user needs.
Found outdated info? Send a correction.
Related DataCost Pages
Fibre hubStart with the full DataCost fibre decision guide.How fibre worksUnderstand the line, ONT, router, ISP and installation steps.FNO vs ISPKnow who owns the line, who bills you and who fixes faults.Fibre pricesCompare checked price examples with source dates and caveats.Check coverageUse exact-address checks before comparing monthly prices.Installation costsUnderstand setup, router, delivery, cancellation and clawback terms.Fibre vs LTE/5GChoose between fixed fibre, prepaid fibre, LTE, 5G and mobile data.
Frequently Asked Questions
Can DataCost tell me if fibre is available at my exact address?
No. Fibre coverage is address-specific, so DataCost explains what to check and links the decision together, but you must confirm availability on an official provider or FNO coverage checker.
Are the prices on DataCost guaranteed?
No. DataCost treats prices as checked public examples. Final pricing can change by address, FNO, promotion, installation status and provider terms.
Who should I contact when fibre is down?
Start with the ISP that bills you. The ISP can then escalate line or infrastructure faults to the FNO when needed.
DataCost does not sell fibre packages. Use these pages to understand the market, then confirm final price, address coverage, installation terms, router rules and cancellation costs with the official provider.
Author and review notes
Written by Riccardo Vallaro
Telecom & Mobile Services Specialist
Mobile services and telecom professional with experience across VAS, carrier billing, mobile content, and African operator partnerships.
Reviewed / updated: 20 June 2026
Why trust this guide: This fibre guide is built around consumer decisions: coverage, infrastructure owner, ISP role, checked price examples, installation terms and fallback options. Prices are examples, not live quotes.
Found something outdated? Send a correction.