Openreach FTTP ONT

Openreach ONT with BBU in enclosure

This page is about the FTTP termination device that Openreach install for FTTP customers.

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.

Newer ONT installs do not include the BBU, and are also not in a larger enclosure.

The ONT requires power, so will need a mains power socket nearby.

LED Status

Openreach ONT LED Status

LED	Colour	Meaning	Notes
Top (ONT) LEDs
TEL1			We don't use the Tel ports
PORT1	Off	ONT has not ethernet link to the router	Bad. Check the connection/cable to the router
	Blinking/Flashing	Data being transmitted	Good
LOS (Loss of service) PON (Passive Optical Network)	PON 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 red	Possible fault with the fibre	Bad. Check fibre not damaged, reconnect fibre, power cycle ONT.
POWER	Green	Device has power	Good
	Off	Power is off	Bad. Check mains power and connection to BBU/ONT.
Bottom right (BBU) LEDs
STATUS	Green		Good
FAULT	Red	Battery fault	Replace the AA batteries inside.
CHARGING	Orange		Wait; the batteries are charging (usually after a power cut).
	Off		Good. The batteries are fully charged.

External links

• 1+1 ONT and Enclosure Factsheet