Openreach FTTP ONT: Difference between revisions

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(Not all ONT has a BBU!)
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[[File:ont.png|thumb|Openreach ONT]]
[[File:ont.png|thumb|Openreach ONT with BBU in enclosure]]


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


The Openreach ONT is actually inside an enclosure which also contains a Battery Backup Unit (BBU) and various wiring.
Older Openreach ONT (Optical Network Terminal​), such as the one pictured is actually inside an enclosure which also contains a Battery Backup Unit (BBU) and various wiring.

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

Revision as of 01:16, 11 November 2021


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 Terminal​), such as the one pictured is actually inside an enclosure which also contains a Battery Backup Unit (BBU) and various wiring.

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 - Main LEDs at the top
LED Colour Meaning Notes
Power Green Device has power Good
Off Power is off Bad. Check mains power
PON & LOS
(Passive Optical Network
Loss of service)
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
PORT1 Off ONT has not ethernet link to the router Bad. Check the connection/cable to the router
Blinking/Flashing Data being transmitted Good
Tel We don't use the Tel ports
Status/Fault/Charging Related to the battery backup The 'fault' LED indicated a fault with the battery, and not related to a fault with the FTTP service.