DOCSIS 3.0 Cable Modem User Guide

32 4023034 Rev B

Front Panel LED Status Indicator Functions

Initial Power Up, Calibration, and Registration

The following chart illustrates the sequence of steps and the corresponding

appearance of the cable modem front panel LED status indicators during power-up,

calibration, and registration on the network. Use this chart to troubleshoot the power

up, calibration, and registration process of your cable modem.

Note: After the cable modem completes step 8 (Registration Complete), the modem

proceeds immediately to step 9, Normal Operations. See the table in Normal

Operations (on page

33).

Front Panel LED Status Indicators During Initial Power-Up, Calibration, and Registration

Step 1 2 3 4 5 6 7 8

Front Panel

Indicator

Power

Self

Test

Downstream

Scan

Downstream

Signal Lock

Ranging Requesting

IP Address

Registering Registration

Complete

1 POWER

On On On On On On On On

2 DS

Blinks On

1 sec

Blinks On On On On On

3 US

Blinks On

1 sec

Off Off Blinks On On On

4 ONLINE

Blinks On

1 sec

Off Off Off Off Blinks On

5 LINK

Off On

1 sec

Off - When no devices are connected to the Ethernet or USB ports

On - When devices are connected to the Ethernet or USB ports

Blinks - When data activity is present