About StatusLights.com
StatusLights.com is Infotel Systems' Device Blinking Light Guide. It documents the LED indicators on equipment Infotel uses in its own data center and at customer sites — cable and DSL modems, fiber ONTs, routers, firewalls, switches, VoIP phones, paging gear and carrier T1 equipment — organized by manufacturer. It also covers testing tools and methods such as a T1 loopback plug, a Mod-Tap cable tester and the Verizon FiOS test process for connecting your own router to the ONT.
Common light meanings (general)
| Light | Solid | Blinking | Off | Amber / red (common meanings) |
|---|---|---|---|---|
| Power | On normally | Booting or firmware update — don't unplug | No power: check outlet, adapter, PoE | Self-test failure or hardware fault |
| DS / US / Online (cable modem) | Locked to provider | Searching for signal / registering | No cable signal | Some models use color to show bonded channels or a fallback mode |
| DSL / Sync | Trained up | Training — loops forever = line problem | No DSL signal on the line | Varies by model |
| PON / Optical (fiber ONT) | Fiber link up | Ranging / registering | No fiber signal | Red on many ONTs = loss of signal; call the provider |
| Internet / WAN | Connected with an IP address | Traffic | No upstream link | Often: link up but no internet / no IP |
| LAN / Ethernet port | Link | Activity | No link: cable or device | On many switches amber = 10/100 speed, green = 1 Gbps |
| Phone / Line (VoIP adapter or phone) | Registered / line ready | Ringing, in use, or voicemail waiting | Not registered with the provider | Registration or provisioning failure |
| PoE | Supplying power | Negotiating | No power on port | Over budget or fault |
This table is a general guide only. Manufacturers use different colors and blink patterns, and the same color can mean different things on two models. Check the exact device below.
Look up your device by manufacturer
Each link opens the StatusLights.com page for that vendor's equipment.
Testing tools and methods
- T1 loopback plug — test at the point your T1 leaves the carrier's network.
- Mod-Tap cable tester — status LEDs on a common cable tester.
- Verizon FiOS test process — required when connecting your own router to a Verizon ONT.
- The story behind StatusLights.com
A tech's order of operations
- Start at the provider's box (modem or ONT) and work toward the phones.
- Write down what every light is doing before rebooting — the reboot erases the evidence.
- If the provider box shows no signal, the problem is outside: call the provider.
- If the provider box is fine but the router's WAN is dark, check the cable between them.
- If the phone's line light is off, the phone isn't registered — see the DNS & SRV and NAT tests.
Frequently asked questions
What do the blinking lights on my modem mean?
Generally, a solid light means a connection is established and a blinking light means it is searching or passing traffic. On cable modems, blinking downstream or upstream lights mean the modem is trying to lock onto the provider's signal; if they never go solid, there is a signal or provisioning problem. Exact meanings vary by model, so look up your modem on StatusLights.com.
What does an orange or amber light on a router mean?
It depends on the model. On many routers amber on the Internet light means the router has a physical link but no internet connection or IP address. On many Ethernet switches, amber on a port means the link negotiated at 10/100 Mbps instead of 1 Gbps. Check the device's guide to be sure.
What does a red light on my fiber ONT mean?
On many fiber ONTs a red optical or alarm light means loss of signal on the fiber — a problem the provider usually needs to fix. Don't unplug the fiber connector. Note the light pattern and call the provider.
Why is the phone light off on my VoIP adapter?
On most analog telephone adapters (ATAs) and VoIP phones, an off Phone or Line light means the device is not registered with the provider. Check the internet light, the network cable, and the adapter's registration status page, or contact your phone provider.
Should I reboot my modem when the lights are blinking?
First write down what every light is doing, because a reboot erases that clue. Blinking during startup or a firmware update is normal — don't unplug the device then. If the lights never settle after 5–10 minutes, a reboot is reasonable, and if that doesn't help, call the provider with the light pattern.
What is StatusLights.com?
StatusLights.com is a free Device Blinking Light Guide from Infotel Systems of Richmond, Virginia. It explains the status LEDs on modems, ONTs, routers, firewalls, switches, VoIP phones and telecom equipment from dozens of manufacturers, plus testing tools and methods.
Sources & references
Written by Eric · Reviewed November 2026