Router Lights Explained
Light names and colors vary by manufacturer, but their patterns help identify where a connection is failing.
Common Router Lights
| Light | Typical meaning | Check |
|---|---|---|
| Power | Equipment has power and is starting | Solid after boot is common |
| Internet/WAN | Router sees an upstream connection | Red or off may indicate no upstream service |
| Wi-Fi | Wireless radio is enabled; blinking often shows activity | Off can mean Wi-Fi is disabled |
| LAN/Ethernet | A wired device is linked | Try another cable or port when off |
| WPS | Push-button pairing is active | Normally only flashes during pairing |
Modem and Fiber Indicators
Cable modems may show downstream, upstream and online lights. Fiber ONTs may show PON and LOS. A red LOS light commonly indicates loss of optical signal and usually requires provider attention. Never look into or sharply bend a fiber connector.
Use the Manual for Exact Meaning
A green light is not universal proof of normal service, and a blinking light is not automatically an error. Search the exact model’s official manual before interpreting unusual colors or patterns.
What to Record Before Calling Support
- Exact equipment model
- Light name, color and whether it is solid or blinking
- Whether all devices or one device is affected
- Any outage notice
- Time the problem started
Related Internet Guides
Router Lights Explained FAQs
Should every router light blink?
No. Activity lights may blink, while power or status lights may remain solid. The expected pattern depends on the model.
What does a red internet light mean?
It often indicates that the router cannot reach the provider, but the exact meaning must be checked in the manufacturer’s manual.
What does LOS mean on fiber equipment?
LOS usually means loss of signal. Check the provider connection and contact the ISP if it remains red.