Cable Modem Troubleshooting: Com21 DP1110XB2

Off – Modem is not receiving power.
On – Modem power is activated and receiving power.

Flashing Fast (1/2 sec) – Finding downstream frequency.
Flashing Slow (1 sec) – Finding upstream frequency.
On – Modem is acquired.

On – Valid USB connection is detected.
Flashing – Data is being transmitted.

Notes and Useful Information:

Certain versions of this modem may not have a USB port. In this case, the LAN and USB lights are replaced with a RX and TX light which indicate receiving and transmitting data.

Installation and User Manual
Manufacturer Product Website