What Equipment Do You Need for Fiber Internet Installation?

Your fiber installation day is booked, the engineer is coming between 8 a.m. and 1 p.m., and you have no idea what is about to be fitted to your house, or what, if anything, you need to provide yourself.

That uncertainty causes most installation-day problems: no power socket where the equipment needs to go, or furniture blocking the entry point.

This guide lists every piece of equipment involved in a typical full fiber installation, what the provider supplies, what you may need to supply, and how to prepare so the job finishes in one visit.

Quick Answer

For a full fiber installation you need an external junction box, a fiber cable to your home, an Optical Network Terminal (ONT) inside with a power socket nearby, and a router connected to the ONT by Ethernet cable. Your provider supplies the fiber, ONT, and usually the router; you supply power sockets, a suitable location, and any extra mesh Wi-Fi or cabling for larger homes.

How Full Fiber Reaches Your Router, in Order

Full fiber, often called FTTP or Fiber to the Premises, carries data as pulses of light through glass fibers thinner than a human hair. Unlike older connections, no part of your broadband journey uses copper phone line.

Understanding the chain of equipment helps you plan where everything will live. The signal passes through four stages before it reaches your phone or laptop.

From the Street to Your Wall

Out in the street, your provider’s network terminates at a distribution point on a pole or in an underground chamber. From there, a rugged drop fiber cable runs to your property, either overhead from a pole or underground through ducting.

On your outside wall the engineer fits a small grey or white box called a Customer Splice Point or external junction box, roughly the size of a paperback book. This is where the external cable is joined, or spliced, to the internal cable.

Inside Your Home: The ONT

Inside, the fiber terminates at the Optical Network Terminal, the ONT. It is a small powered box, typically about 10 cm by 10 cm, fixed to the wall close to where the cable enters.

The ONT converts the light signals back into electrical Ethernet signals your router can use. It needs mains power at all times, usually from a standard 12V power adapter, and it has status lights and one or more Ethernet ports, commonly 1 Gbps, with 2.5 Gbps ports appearing on gigabit-plus services. Background on how these networks work is covered in the overview of passive optical networks and ONTs, which explains why no power is needed in the street cabinet itself.

Equipment Your Provider Normally Supplies

On a standard installation, you should not have to buy any of the core equipment. Confirm this list when you book, because packages differ slightly between providers.

1. The external drop fiber cable and the external splice box fitted to your wall.
2. The internal fiber lead-in cable, usually up to 10 to 15 metres from the entry point to the ONT position included as standard.
3. The ONT itself, plus its power adapter, fitted and tested by the engineer.
4. A Wi-Fi router, normally Wi-Fi 6 on current packages, with its power adapter and one Ethernet cable, typically 1 to 2 metres long, to connect router to ONT.
5. Any drilling, wall fixings, and weather sealing needed for the standard cable route.

The Router the Provider Gives You

Provider routers are designed to be adequate for an average home, with dual-band Wi-Fi on 2.4 GHz and 5 GHz and usually four Gigabit Ethernet ports. For speeds up to about 500 Mbps in a flat or small house, it is genuinely enough.

On 900 Mbps to 1 Gbps packages, or in larger homes with thick walls, the free router is often the bottleneck. You can usually use your own router instead, as long as it supports the provider’s connection settings such as DHCP or PPPoE and a WAN Ethernet port; the ONT stays the same either way.

If you are deciding whether to upgrade, our comparison of provider fiber routers versus mesh Wi-Fi systems walks through the coverage differences room by room.

Equipment You May Need to Provide Yourself

The installation gets you online at the ONT. Everything beyond that, spreading fast Wi-Fi reliably around your home, is your responsibility to plan.

Power, Position, and Cabling

You need a free double power socket within about 1 to 2 metres of the ONT position, one outlet for the ONT and one for the router. Running either box from a long trailing extension lead is untidy and a common cause of accidental switch-offs.

If you want the router in a different room from the ONT, you will need a longer Ethernet cable, Cat5e is fine up to 1 Gbps, Cat6 is the safer choice for multi-gigabit services. Ethernet can run up to 100 metres without loss, so distance is rarely a problem; hiding the cable neatly is the real job.

Mesh Wi-Fi and Extras for Larger Homes

For houses over about 100 square metres, or with three or more floors, budget for a mesh system with two or three nodes. Place nodes within line of sight of each other where possible, ideally no more than one room apart.

Also consider a small network switch, typically 5 or 8 ports, if you want wired connections for a TV, console, and desktop PC at once. Wired backhaul between mesh nodes, using Ethernet, gives noticeably more consistent speeds than wireless links.

Battery Backup and Phone Considerations

Full fiber does not carry power like the old copper phone line, so in a power cut your ONT, router, and digital voice phone all stop working. If you rely on a landline for emergencies, ask about a battery backup unit, which providers must offer to vulnerable customers.

Preparing Your Home Before Installation Day

A little preparation is the difference between a one-hour visit and a rearranged appointment. Work through this list the day before.

1. Decide where the ONT should go: an accessible ground-floor wall near a power socket, ideally close to where you want the router.
2. Clear furniture, boxes, and fragile items away from that wall and from the likely cable route outside.
3. Make sure the engineer can reach the outside wall, including unlocking side gates and moving cars or bins.
4. Keep pets in another room and arrange for an adult over 18 to be present for the whole appointment.
5. Note your current Wi-Fi name and password if you want the engineer or yourself to reuse them on the new router, so all your devices reconnect automatically.

What the Engineer Will and Will Not Do

Engineers will drill one entry hole, fit the boxes, splice and test the fiber, and confirm your speed at the ONT and router before leaving. A typical straightforward install takes 1 to 2 hours.

They will not normally run long internal cable routes through multiple rooms, work in lofts without safe access, or move heavy furniture. Non-standard routes can sometimes be arranged, but they may incur a charge, so agree the route at the door before work starts.

Common Mistakes to Avoid

The most common mistake is choosing the ONT position purely by where the cable enters, then discovering Wi-Fi from that corner cupboard barely reaches the bedrooms. Router position matters more than installation convenience, plan it first.

Another is having no power near the agreed position. Engineers cannot fit an ONT where there is no socket, and last-minute changes often mean a worse location for the next ten years.

People also throw away the provider router before testing. Keep it even if you plan to use your own equipment, because providers will ask you to reconnect it during any future fault diagnosis.

Finally, do not cancel your old service until the fiber is live and tested. Overlaps of a few days cost little, whereas a failed install with your old broadband already switched off leaves you with no connection at all.

Conclusion

A full fiber installation needs surprisingly little from you: the provider supplies the drop cable, external splice box, internal fiber, ONT, and usually a capable Wi-Fi 6 router. Your real job is preparation: a sensible ONT and router location, a free double socket nearby, and, for larger homes, a mesh system and Ethernet cabling to spread the speed you are paying for.

Agree the cable route with the engineer before drilling starts, test speeds together before they leave, and keep the supplied router as a spare. Do that, and installation day becomes the easy part of moving to full fiber.

Frequently Asked Questions

Can I use my own router with full fiber?

Yes, in most cases. Your router connects to the ONT by Ethernet and needs to support your provider’s WAN settings, which the provider publishes in its help pages. The ONT itself is always the provider’s equipment and cannot be replaced.

Does the ONT need to stay on all the time?

Yes. The ONT is your connection point, so switching it off cuts your broadband completely, and it can take several minutes to resync after power returns. Plug it directly into a wall socket rather than a switched extension you might turn off.

How long does a fiber installation take?

A standard install where ducting or a pole is already in place usually takes 1 to 2 hours. If new underground ducting or a road crossing is needed, the provider will do that civil work first on a separate visit, which can add one to several weeks.

Will fiber work during a power cut?

No. Unlike the old copper phone line, full fiber equipment in your home needs mains power. Mobile phones still work, and battery backup units are available for the ONT and router, particularly for customers who depend on a landline for safety.

Do I need new cables inside my house for gigabit speeds?

For wired devices, use at least Cat5e Ethernet, which supports 1 Gbps up to 100 metres, or Cat6 for multi-gigabit services. Very old Cat5 cable can limit you to 100 Mbps, so check the printing on the cable jacket if speeds disappoint.