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
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)
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