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36 Part Number 4021203 Rev A
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 7 (Registration Completed), the modem
proceeds immediately to Normal Operations. See
Normal Operations (AC Power
Applied)
(on page 37).
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
Completed
1 POWER On On On On On On On On
2
DS Blinking On Blinking On On On On On
3
US Blinking On Off Off Blinking On On On
4
ONLINE Blinking On Off Off Off Off Blinking On
5
LINK Off On On or
Blinking
On or
Blinking
On or
Blinking
On or
Blinking
On or
Blinking
On or
Blinking
TEL1 Off On Off Off Off Off Off Off 6
TEL2 Off On Off Off Off Off Off Off
* The ONLINE LED illuminates continuously 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 ONLINE LED is off.
36


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