Arris CM3500 for nbn HFC Status Lights
Checking the status lights on your nbn Connection Box (NCB) for nbn HFC can be useful for troubleshooting.
If you got your NCB before 1 October 2024, you probably have an Arris CM8200.
Select one of the links below to jump to a query:
nbn HFC Connection Box Status lights
On the back
| Light | State | Meaning | |
| 2.5 G LINK | Off | Nothing is plugged into the 2.5G port. | |
| Green | A device is plugged in with a CAT5e or CAT6 Ethernet cable. | ||
| Yellow | A device is plugged in with an older CAT5 Ethernet cable, which may not support the full speed of your nbn HFC plan. We recommend switching to a CAT5e ot CAT6 Ethernet cable. | ||
On the front
| Light | State | Meaning | |
| POWER | Off | No power. | |
| Green | Your NCB has power. | ||
| DOWNSTREAM | Off | Your NCB is still searching for a connection, or has no power. | |
| Green | Your NCB can download data. | ||
| Flashing | A firmware upgrade is in progress - this should take 10 minutes or less. | ||
| UPSTREAM | Off | Your NCB is still searching for a connection, or has no power. | |
| Green | Your NCB can upload data. | ||
| Flashing | A firmware upgrade is in progress - this should take 10 minutes or less. | ||
| ONLINE | Off | No connection to the network. Try troubleshooting. | |
| Green | Your nbn connection is working as expected. | ||
