This isn't used for your AT&T internet service. FAIL: Off: The ONT is working as expected. Green (solid) There's a problem with the ONT. Green (flashing) The ONT is connecting to the AT&T network. LAN 1G: Green (solid) The ONT is connected to your gateway. Green (flashing) The ONT has data activity. Off: The Ethernet isn't working. You.. Other indicator lights on your AT&T modem include the Wi-Fi light, which indicates the status of your wireless network, and the Ethernet light, which shows if a wired connection is active.. If the issue continues, try restarting your modem and router. Additionally, if the DSL or Broadband light is not lit, it signifies that there is an issue.

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The flickering of the light represents data traffic. Home PNA: Green: A set-top box or other device is connected to the coaxial port. Flickering Green: There is activity from devices connected to the coaxial port. The flickering of the light is synchronized to data traffic. Phone 1 & 2: Green: A phone is connected and registered.. 1. Blinking Red (Fast) A fast blinking red light indicates that there is a network service issue which may necessitate intervention by AT&T. This could be a temporary problem, and you should check for a service outage in your area using tools like Smart Home Manager or the myAT&T app on a mobile device.

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