Ultra VDSL2 Network Termination Unit Status Lights
The article will explain the status lights found on the Network Termination Units (NTU) used on our high-speed ULTRA VDSL2 plans.
Adtran® 422G Gfast NTU Status lights
| Light | State | Meaning | |
| POWER | Off | No power. | |
| Green | Your NTU has power. | ||
| GFAST | Flashing green | Make sure the phone cable between your NTU and phone socket is plugged in securely, and restart your NTU. Please call us on 13 22 58 if the light stays flashing. Note: You must use the supplied 1-metre phone cable. Longer phone cables can cause connection issues. |
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| Green | Your NTU is operating normally. | ||
| LAN | Off | Make sure the Ethernet cable between your NTU and modem is plugged in securely, and restart your NTU. If the light stays off, try a new Ethernet cable. Please call us on 13 22 58 if the issue persists. | |
| Green | Successful network connection. This light flashes during data transfer. | ||