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FTTP Modem Lights Explained
Last Updated: Sunday 14 Sept 2025
There are 3 versions of the Fibre to the Premises (FTTP) modem, also called an Network Termination Device (NTD).
Check the images below for the version that looks like yours.
Indicator Status Description Action Power Off No power If an extension cord, power board or AC UPS is used with the NTD, disconnect these devices, plug the NBNCo Power Supply directly into the AC outlet and make sure that the AC supply is turned on Power Solid red Operating from battery - if main power is off None Power Solid green Operating on AC power None Power Flashing green NTD is starting up None Optical Off NTD is disabled None Optical Solid red Optical link is disconnected Check optical patch lead is seated fully in Optical Port and not excessively kinked Optical Solid green Optical link is connected None Optical Flashing green Activity None Alarm Off NTD is operating without failure None Alarm Solid red NTD hardware failure Contact our support team on 1300 880 905 Alarm Solid green No alarm, with local Ethernet access enabled None UNI D1 to D4 Off No service provisioned or no link detected None UNI D1 to D4 Solid yellow 1G link detected None UNI D1 to D4 Flashing yellow 1G data activity None UNI D1 to D4 Solid green 10/100 link detected None UNI D1 to D4 Flashing green 10/100 data activity None 
PowerIndicator
Meaning
Action
Off
There is no power to your NBN connection box.
Check the power supply is plugged in and switched on and is connected to your NBN connection box. If there is still no power light, contact your provider.
Green – slow flashing
Your NBN connection box is starting up.
No action is required. The flashing light should turn into a green solid light shortly.
Green – fast flashing
Your NBN connection box is getting a firmware update.
No action required.
Green - solid
Your power supply is working normally.
No action required.
Optical
Indicator
Meaning
Action
Off
Your NBN connection box is not connected to the NBN network.
Raise a fault through MyAussie, or get in touch with our team via LiveChat, or giving us a call.
Green – steady light
The NBN connection box is connected to the NBN network and can receive data.
No action required.
Green – slow flashing
Your NBN connection box is connected and receiving data.
No action required.
Red
Your NBN connection box has lost connection.
Raise a fault through MyAussie, or get in touch with our team via LiveChat, or giving us a call.
Alarm
Indicator
Meaning
Action
Red
Your NBN connection box has a fault and is not working normally.
Raise a fault through MyAussie, or get in touch with our team via LiveChat, or giving us a call.
Off
Your NBN connection box is operating normally.
No action required.
Port 1
Indicator
Meaning
Action
Off
The Wi-Fi router is not connected to the NBN connection box.
Check your Wi-Fi router is correctly plugged in to the NBN connection box.
Green – fast flashing
There is an active service and data is being transferred through the port.
No action is required.
Green
There is an active service but data isn't being transferred through the port at the moment.
No action is required.
Power
Indicator
Meaning
Action
Off
There is no power to your NBN connection box.
Check the power supply is plugged in and switched on and is connected to your NBN connection box. If there is still no power light, contact your provider.
Green – slow flashing
Your NBN connection box is starting up.
No action is required. The flashing light should turn into a green solid light shortly.
Green – fast flashing
Your NBN connection box is getting a firmware update.
No action required.
Green - solid
Your power supply is working normally.
No action required.
Optical
Indicator
Meaning
Action
Off
Your NBN connection box is not connected to the NBN network.
Raise a fault through MyAussie, or get in touch with our team via LiveChat, or giving us a call.
Green – steady light
The NBN connection box is connected to the NBN network and can receive data.
No action required.
Green – slow flashing
Your NBN connection box is connected and receiving data.
No action required.
Red
Your NBN connection box has lost connection.
Raise a fault through MyAussie, or get in touch with our team via LiveChat, or giving us a call.
Alarm
Indicator
Meaning
Action
Red
Your NBN connection box has a fault and is not working normally.
Raise a fault through MyAussie, or get in touch with our team via LiveChat, or giving us a call.
Off
Your NBN connection box is operating normally.
No action required.
Port 1, Port 2, Port 3 or, Port 4
Indicator
Meaning
Action
Off
The Wi-Fi router is not connected to the NBN connection box.
Check your Wi-Fi router is correctly plugged in to the NBN connection box.
Green – fast flashing
There is an active service and data is being transferred through the port.
No action is required.
Green
There is an active service but data isn't being transferred through the port at the moment.
No action is required.
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