(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:

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

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