How to read the lights on your tower modem

This page applies to any tower or box-style CenturyLink modem/router.

For all following models:
Actiontec   *   Adtran   *   Calix   *   Technicolor   *   Zyxel 

Not the right kind of modem? Try the C4000 guide instead.

There's a lot of technology built into that black box that brings your internet connection into your home. Learn what the flickering lights on the front of your modem mean, and how to troubleshoot related problems with your connection. 

Power light
DSL light
Internet light
Ethernet light
WiFi light
WPS light
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