Troubleshooting
The modem lights indicate the current status of your cable modem. To troubleshoot any connection problems, use the table below.
Modem LED Light | Status | Problem |
---|
Power | Off | No power. Verify all cable connections and try resetting the modem. |
Green | None. |
Red | The cable modem is too warm and might overheat: - Disconnect the power adapter.
- Wait a couple of minutes to let the cable modem cool down.
- Make sure that the cable modem is placed in a vertical position.
- Make sure that the cable modem is placed in a location with good ventilation.
- Reconnect the power adapter.
|
Downstream
| Blinking Green | Scanning for downstream channel. Verify all cable connections and try resetting the modem. |
Solid Amber | None. Connection established on one channel. |
Solid Green | None. Operating on more than one channel. |
Off | Downstream channel inactive. Verify all cable connections and try resetting the modem. If cable is OK and modem reset does not work, contact support. |
Upstream
| Off | Upstream channel inactive. Verify all cable connections and try resetting the modem. |
Blinking Green | Scanning for upstream channel. Verify all cable connections and try resetting the modem. |
Solid Amber | None. Connection established on one channel. |
Solid Green | None. Operating on more than one channel. |
Internet
| Off | Modem offline. Verify all cable connections and try resetting the modem. |
Blinking Green | None. Scanning for configuration parameters. Verify all cable connections and try resetting the modem. |
Solid Green | None. Operational. |
2.4 GHz
| Off | 2.4 GHz radio off. |
Solid Green | None. 2.4 GHz radio on. |
5 GHz
| Off | 5 GHz radio off. |
Solid Green | None. 5 GHz radio on. |
Ethernet | Off | A device is not connected to the Ethernet port on the back. Connect a device to the Ethernet port on the back. |
Solid Green | None. A device is connected to the Ethernet port. |
WiFi On/Off
| Off | WiFi disabled. |
On | None. WiFi enabled. |
WPS
| Blinking Green | None. This button lets you use WPS to join the WiFi network without typing the WiFi password. The WPS LED blinks during this process and then lights solid. |
Manufacturer Resources
For more detailed technical information on the C7800, refer to the following resource.
Quick Start Guide (PDF)