User’s Guide
29
Installation problems with the cable modem are commonly due to the cable network and its topography.
LEDs on the front panel of the cable modem reveal operational status and help you determine problem
areas.
LEDs indications
( “X” means not applicable)
Initialization
Sequence
power
usb
enet
send
recv
sync
ready
Power ON
On
Off
Off
Off
Off
Off
Off
Hardware
Testing
On
Off
Off
Off
Off
Off
Off
Search
Downstream
Channel
On
X
X
X
Blink
Off
Off
Downstream
Locked
On
X
X
X
X
On
Slow
Blink
Search
Upstream
Channel
On
X
X
X
X
On
Fast Blink
Ranging OK
and
Registration
Success
On
X
X
X
X
On
On
Ethernet Port
power
usb
enet
send
recv
sync
ready
Send Data
On
Off
Blink
Blink
X
On
On
Receive Data
On
Off
Blink
X
Blink
On
On
USB Port
power
usb
enet
send
recv
sync
ready
Send Data
On
Blink
Off
Blink
X
On
On
Receive Data
On
Blink
Off
X
Blink
On
On
