Front Panel LED Status Indicator Functions

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 front panel lights on the cable modem 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 Completed), the modem proceeds immediately to Normal Operations.

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

Step

 

1

2

3

4

5

6

7

8

 

 

 

 

 

 

 

 

 

 

Front Panel

Power

Self

Downstream

Downstream

Ranging

Requesting

Registering

Registration

Indicator

Up

Test

Scan

Signal Lock

 

IP Address

 

Complete

41

 

Line 2

Off

On

Off

Off

Off

Off

Off

Off

5

 

Line 1

Off

On

Off

Off

Off

Off

Off

Off

6

 

PC2

Off

On

Off, On or

Off, On or

Off, On or

Off, On or

Off, On or

Off or On

 

 

 

 

 

Blinking

Blinking

Blinking

Blinking

Blinking

 

7

 

Cable

Off

On

Slow

Momentary

Off

Blinking

Blinking

On

 

 

 

 

 

Blinking

On

 

2 Blinks

4 Blinks

 

 

 

 

 

 

1 Blink

 

 

 

 

 

8

 

Send

Off

On

Off

Off

Occasional

Occasional

Occasional

On

 

 

 

 

 

 

 

Blinking

Blinking

Blinking

 

9

 

Receive

Off

On

Off

Off

Occasional

Occasional

Occasional

On

 

 

 

 

 

 

 

Blinking

Blinking

Blinking

 

10

 

Power

On

On

On

On

On

On

On

On

1LEDs number 1, 2, and 3 (Replace Battery, Battery Low, and AC Power) are part of the optional battery pack and are not affected by the power up, calibration, and registration process.

2The PC light is on whenever a PC is connected to the modem, and it blinks to indicate that data is being transferred. If the modem is used to provide telephone service only and is not connected to a PC, the PC light is off.

4004041 Rev C

47