nbn® FTTP Connection Box Status Lights
Checking the status lights on your indoor nbn Connection Box (NCB) for nbn FTTP can be useful for troubleshooting.
You may need to check the Serial Number on your NCB to complete your order.
Select one of the links below to jump to a query:
- Lifting the nbn FTTP Connection Box cover
- Where to find your nbn FTTP Connection Box Serial Number
- nbn FTTP Connection Box Status lights
- Are the lights behaving strangely?
Lifting the nbn FTTP Connection Box cover
If your NCB has a cover, you can open it by, gently prising the cover away from the two clips on the bottom, then lifting the cover upwards.
Once the cover is lifted, you'll see the status lights at the top of the NCB and the ports are on the bottom.
Where to find your nbn FTTP Connection Box Serial Number
The Serial Number for your NCB is listed next to S/N on its barcode sticker.
nbn FTTP Connection Box Status lights
| Light | State | Meaning | |
| POWER | Off | No power. | |
| Red | Using backup battery power from the Power Supply unit (if you have one). | ||
| Green | Your NCB has power. It's normal if this light looks more orange/yellow than green. | ||
| OPTICAL | Off | Your NCB is disabled. Please call us on 1300 997 271 as we'll need to lodge a ticket with nbn®. | |
| Red | No connection to the network. Try troubleshooting. | ||
| Green | Successful network connection. This light will flash during data transfer. | ||
| ALARM | Off | No devices are connected. | |
| Red | Issue detected. Try troubleshooting. | ||
| Green | Your NCB is working with no issues detected. | ||
| UNI-D 1/2/3/4 | Off | Nothing is plugged into this port. Only one UNI-D port is active for each nbn service - usually UNI-D 1. If you don't know which UNI-D port to use, call us on 1300 997 271 and we'll help you. | |
| Orange | A device capable of up to 1000Mbps is plugged in. This light will flash during data transfer. | ||
| Green | A device capable of up to 10/100Mbps is plugged in. This light will flash during data transfer. | ||
| UNI-V 1/2 | Off | There is no nbn Phone service, or it's not currently being used. Note: Fibre Phone is no longer sold as of 23 May 2024. | |
| Green | One or more nbn Phones are off the hook (typically because they are being used). | ||
| Flashing | One or more nbn Phones have been off the hook for more than an hour. If no one is on a long phone call, hang up the phone. | ||
| UPDATE | Off | It's normal for this light to be off. | |
| Red | Your NCB has failed to download an update. Please call us on 1300 997 271 as we'll need to lodge a ticket with nbn®. | ||
| Green | Your NCB is currently downloading an update with no issues. | ||
Are the lights behaving strangely?
If you're seeing some weird behaviour such as lights for empty UNI-D ports turned on or flashing, have there been recent lightning storms in your area?
If you think your NCB, cables or other nbn equipment have been affected by a lightning strike, please call us on 1300 997 271.