This chapter describes the functions of the cable modem’s LEDs and connectors.

If the POWER, USB, SYNC, and READY LEDs are lit, the cable modem is working properly. The USB or ENET LED should also be lit depending on what port is being used.

The following table provides an overview of the LED indicator lights on the front of the cable modem and what the LEDs mean.

LED                      LED                      Normal State                      Description
Name                    Color

POWER               Green                              On                            Indicates that the cable modem is properly powered on.

USB                     Green                       On/Flashing                      Indicates that the cable modem is properly connected
                                                        (Off when the USB                to the computer’s USB port.
                                                          port is not used)                  Flashing when the cable modem is transferring data over the USB cable.

ENET                   Green                       On/Flashing                      Indicates that the cable modem is properly connected
                                                        (Off when the Ethernet           to the computer’s Ethernet port.
                                                          port is not used)                  Flashes when the cable  modem is transferring data over the
                                                                                                     Ethernet cable.

SEND                   Green                           Random                       Flashes when the cable modem sends data to the Internet.

RECEIVE              Green                          Random                       Blinks when the cable modem receives data from the
                                                                                                     Internet.  During initialization, LED flashes slowly to indicate that the cable modem
                                                                                                     searching for a downstream channel

SYNC                   Green                             On                            Indicates that the cable modem has established a downstream channel.

READY                 Green                             On                            Indicates that modem has ranged and registered on the CM network and ready
                                                                                                     to send/receive data.

Downstream Operating range is -15 to +15dBmv.