Openreach FTTP ONT

(Newer) Openreach single port ONT - Lights show all good

(Older) Openreach ONT - Lights show all good

(Newer) Openreach single port ONT ports

(Older) Openreach ONT, powered off!

(Older) Openreach ONT, powered on and working OK

(Older) Openreach ONT, cover removed. Customer router connects to yellow socket

This page is about the FTTP termination device that Openreach install for FTTP customers. ONT stands for Optical Network Terminal, sometimes (mistakenly) called an openreach modem. CityFibre use a different ONT - we have a separate page on that: CityFibre ONT

Summary:

• In short, the ONT in installed inside the customer's premises by Openreach and converts the fibre connection from the outside world in to a RJ45 port which you plug in to your router with a CAT5 cable.
• The ONT requires power, and a UPS is recommended, see our VoIP_Power page for suggestions.

Openreach provide an ONT for use with FTTP services. - so when you order a BT-based FTTP service from A&A, an Openreach engineer will install the little ONT unit in your premises. You then connect your Ethernet router to it and set your router with the A&A PPP credentials to log in.

This page is about diagnosing problems with the Openreach ONT.

• A working Openreach unit has green: power, PON & LAN lights, anything else indicates a problem.
• Your PPPoE capable router will plug in to the LAN port and connect you to the internet.

More info

• Newer ONT installs do not include a Battery Backup Unit (BBU) See: 999_and_faults
• Older Openreach ONT (Optical Network Termination) such as the one pictured, is actually inside the enclosure. This also contains a Battery Backup Unit (BBU) along with various wiring and cable management.
• The ONT requires power, so will need a mains power socket nearby.
• Where provided, the battery has a short warranty, and should be maintained by the end user, however, the battery is to keep the unit powered so that the TEL ports can be used during a power outage - we don't use the TEL ports, so you will want to make other arrangements for using a phone during a power outage - eg a mobile phone. See: 999_and_faults
• At least newly installed BT ONTs support Baby Jumbo frames (see MTU)

Openreach ONT LED Status

Openreach ONT LED Status

LED	Colour	Meaning	Notes
Top (ONT) LEDs
TEL1	Off		We don't use the Tel ports
PORT1 or LAN	Blinking/Flashing green	Data being transmitted	Good
	Off	ONT has no ethernet link to the router	Bad. Check the connection/cable to the router
LOS (Loss of service) PON (Passive Optical Network)	PON solid green, LOS off	Connected and should be working	Good. This is how it should be normally
	PON flashing green, LOS off	ONT is starting up	Wait a bit for steady green and all should be well...
	PON off, LOS solid red	Possible fault with the fibre	Bad. Check fibre not damaged, reconnect fibre, power cycle ONT
POWER	Solid green	Device has power	Good
	Off	Power is off	Bad. Check mains power and connection to BBU/ONT
Bottom right (BBU) LEDs
STATUS	Solid green		Good
	Off
FAULT	Solid red	Battery fault	Bad. Replace the AA batteries inside
	Off		Good. No fault
CHARGING	Solid orange	Batteries are not fully charged	Wait; the batteries are charging (usually after a power cut)
	Off	Batteries are not being charged	Good. The batteries are fully charged

External links

• 1+1 ONT and Enclosure Factsheet

Outdoor Junction box

Outdoor Junction Box

Openreach will usually install a junction box on the outside of the property. This connects up the fibre from the street to the fibre that goes inside the property.

This is a passive device, doesn't require power, and is just used to connect the two fibres together. The photo shows both a Brown CityFibre unit and a Grey Openreach unit.