Openreach FTTP ONT

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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