# Your NBN® box and what the lights on the page mean

> Category: NBN
> Canonical URL: https://crazytel.com.au/knowledgebase/article/nbn-box-and-lights-explained

What the NBN® Connection Box (NTD or NCD) is, which port your router uses, and what the green, amber, red and grey lights on the Your NBN® box panel mean.

Most NBN® connections have an NBN® Connection Box on the wall, put there by NBN®. Your router plugs into one of its ports. You may see it called an NTD (Network Termination Device), or an NCD on Fibre to the Curb.


Find it

NBN® Dashboard › Your NBN® box




The panel is also on each connection's Overview tab. It shows the box's lights and ports, and which port each connection uses. FTTN and FTTB have no NBN® box, because your own modem plugs into the phone socket.




#2 The lights on the page



GreenWorking normally.
AmberCould be better.
Solid redA problem, such as an alarm.
Flashing redThe NBN® network reported a flashing light.
DarkOff. This is normal for the alarm light.
Dark with a red ringA problem, such as nothing plugged into a port, or no response from the box.
Hollow greyNot checked yet.



Good to know. These are the last reading from the NBN® network, not the live lights on your box. If they look different, trust the real box and run Check my NBN® box on Diagnostics & Faults.




#2 Warnings



Nothing detected on Port 1No router is plugged in, or the cable is loose or faulty. Check the cable goes into the port shown.
No fibre signalDo not unplug the fibre cable. Report a fault.
The box is not respondingCheck the box has power, then run a check.



Click a port on the panel to Check this port or Reset this port. A reset can drop your internet for a moment.




#2 Related guides



- NBN® Pulse explained

- Set up your router

- Device speed capability