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
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.
- 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
|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|
|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|