Cable Modem Troubleshooting: Com21 DP111

Light patterns, images, manuals and more helpful info for the Com21 DP111 cable modem –

Manufacturer: Com21 Model: DP111
Modem Light Indicators

On – Receiving power.


Off – Not detecting signal from cable network or not receiving power.
On – Modem is online and ready to transmit data.
Slow Blinking Green – Detecting signal and trying to connect to cable network.
Fast Blinking Green – Rebooting is in progress.

PC Off – Not detecting ethernet connection or not receiving power.
On – Ethernet connection is established to powered-up computer.

Off – Not tranmitting data or not receiving power.
Blinking Green – Transmitting data.


Off – Ready for use after initial self-test or not receiving power.
Blinking Amber – Self-test in progress or software downloading in progress.
Solid Amber – Self-test failed. Corrective action: Try powercycling.

Notes and Useful Information:

Installation and User Manual

Manufacturer Product Website

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