Chapter 1: Connections and Setup
3
Cable Modem Overview
Front Panel
The following illustration shows the front panel of the model:
The LEDs on the front panel are described in the table below (from left to right):
DCM476
Power
DS
US
ONLIN
E
LINK
Description
Boot-up
Operation
ON
ON
ON
ON
ON
Power on 0.25 sec
X
FLASH FLASH FLASH
X
Following system initialization complete to (before) DS scanning
DOCSIS
Start-up
Operation
ON
FLASH
OFF
OFF
X
During DS scanning and acquiring SYNC
ON
ON
FLASH
OFF
X
From SYNC completed, receiving UCD to ranging completed
ON
ON
ON
FLASH
X
During DHCP, configuration file download, registration, and
Baseline Privacy initialization
DHCP status, LED SHOULD be ON 1 sec, and OFF 1 sec
TFTP status, LED SHOULD be ON 0.25 sec, and OFF 0.25 sec
ON
ON
ON
ON
X
Operational (NACO=ON)
ON
FLASH FLASH
OFF
X
Operational (NACO=OFF)
Channel
Bonding
Operation
FLAS
H
FLASH FLASH FLASH FLASH
Wait registration with all DS and all US – Lights Flash sequentially
from the
right to left
Minimum duration 3 seconds
X
X
X
X
OFF
From 1 to 4 DS, from 1 to 4 LEDs are ON.
From 5 to 8 DS, from 1 to 4 LEDs are flashing
Duration 3 seconds
OFF
X
X
OFF
OFF
From 1 to 2 US, from 2 to 3 LEDS are ON.
From 3 to 4 US, from 2 to 3 LEDS are flashing.
Duration 3 seconds
FLAS
H
FLASH FLASH FLASH FLASH
Wait registration with all DS and all US – Lights Flash sequentially
from the
left to right
Minimum duration 3 seconds
CM
Registration
Flavors
ON
ON
ON
ON
X
No US/DS Channel Bonding and Registered with Pre-D30 CMTS
(Green LEDs)
ON
ON
ON
ON
X
US/DS Channel Bonding and Registered with D30 mode (BLUE
LEDs)
