Front Panel LED Status Indicator Functions

Front Panel LED Status Indicator Functions

Initial Power Up, Calibration, and Registration (AC Power applied)

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 when AC power is applied to the cable modem. Use this chart to troubleshoot the power up, calibration, and registration process of your cable modem.

Note: After the cable modem completes step 8 (Registering with Call Agent), the modem proceeds immediately to Normal Operations (AC Power applied).

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

Request

Registering

Register

LED

Up

Test

Scan

Signal Lock

 

IP

 

with Call

 

 

 

 

 

 

 

Address

 

Agent

1

POWER

On

On

On

On

On

On

On

On

 

 

 

 

 

 

 

 

 

 

2

DS

Blink

On for 1

Blink

On

On

On

On

On

 

 

 

second

 

 

 

 

 

 

3

US

Blink

On for 1

Off

Off

Blink

On

On

On

 

 

 

second

 

 

 

 

 

 

4

ONLINE

Blink

On for 1

Off

Off

Off

Off

Blinking

On

 

 

 

second

 

 

 

 

 

 

5

LINK1

Off

On for 1

On or Blink

On or Blink

On or

On or

On or Blink

On

 

 

 

second

 

 

Blink

Blink

 

 

1The LINK LED is on whenever a PC is connected to the modem, and it blinks to indicate that data is being transferred. If the modem provides telephone service only and is not connected to a PC, the LINK LED is OFF.

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4028103 Rev A

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Cisco Systems 4027669 important safety instructions Front Panel LED Status Indicator Functions, LINK1

4027669 specifications

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