Revision as of 01:23, 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 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 - Main LEDs at the top
LED	Colour	Meaning	Notes
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
PORT1	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
Power	Off	Power is off	Bad. Check mains power
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.

@@ Line 18: / Line 18: @@
 ! LED !! Colour !! Meaning !! Notes
 |-
-|rowspan="2"| '''Power''' || Green || Device has power || '''Good'''
+| '''TEL1''' || || || We don't use the Tel ports
 |-
-| Off || Power is off || '''Bad'''. Check mains power
+|rowspan="2"| '''PORT1''' || Off || ONT has not ethernet link to the router || '''Bad'''. Check the connection/cable to the router
 |-
+| Blinking/Flashing || Data being transmitted || '''Good'''
-|rowspan="3"| '''PON & LOS'''  <br>(Passive Optical Network <br> Loss of service)|| PON green, LOS Off || Connected and should be working || '''Good'''. This is how it should be normally
+|-
+|rowspan="3"| '''LOS''' (Loss of service)<br>'''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...
@@ Line 28: / Line 30: @@
 | PON off, LOS red || Possible fault with the fibre || '''Bad'''. Check fibre not damaged, reconnect fibre, power cycle ONT
 |-
-|rowspan="2"| '''PORT1''' || Off || ONT has not ethernet link to the router || '''Bad'''. Check the connection/cable to the router
+|rowspan="2"| '''Power''' || Green || Device has power || '''Good'''
 |-
-| Blinking/Flashing || Data being transmitted || '''Good'''
+| Off || Power is off || '''Bad'''. Check mains power
-|-
-| '''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.