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4004041 Rev C 47
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
Indicator
Power
Up
Self
Test
Downstream
Scan
Downstream
Signal Lock
Ranging Requesting
IP Address
Registering Registration
Complete
4
1
Line 2 Off On Off Off Off Off Off Off
5 Line 1 Off On Off Off Off Off Off Off
6 PC
2
Off On Off, On or
Blinking
Off, On or
Blinking
Off, On or
Blinking
Off, On or
Blinking
Off, On or
Blinking
Off or On
7 Cable Off On Slow
Blinking
1 Blink
Momentary
On
Off Blinking
2 Blinks
Blinking
4 Blinks
On
8 Send Off On Off Off Occasional
Blinking
Occasional
Blinking
Occasional
Blinking
On
9 Receive Off On Off Off Occasional
Blinking
Occasional
Blinking
Occasional
Blinking
On
10 Power On On On On On On On On
1
LEDs 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.
2
The 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.