TECHNICAL SUPPORT
Cable Modem: Linksys BEFCMU210v2 Troubleshooting
► Summary
Troubleshooting
Manufacture Resources
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Cable Modem User and Data Manuals
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Cable Modem Data Manuals
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► Troubleshoot Modem Lights
"Ethernet" light on
"Activity" light flashing
"USB" light on
"Activity" light flashing
"Cable" light flashing or off
► Troubleshooting Diagram:
Modem
Status
Problem
Solution
Light
Power
Solid
When this LED is on, it
N/A
Green
indicates that the Cable Modem
is correctly supplied with
Power
Off
No Power
Verify power supply connections and electrical outlet.
Also make sure the outlet is not connected to a
switch.
Link/ACT
Flashing
This LED becomes solid when
N/A
Green
the Cable Modem is properly
connected to a PC, either
thorugh an Ethernet or USB
cable
Off
Modem does not detect PC
Verify cable connections and try resetting the Modem.
connection
If cable is ok and Modem reset doesn't work, reinstall
NIC (if ours).
Send
Flashing
This LED is solid or will flash
N/A
Green
when data is being transmitted
Off
No data currently being
N/A
transmitted
Receive
Flashing
This LED is solid or will flash
N/A
Green
when data is being transmitted
Off
No data currently being
N/A
transmitted
Cable
On
Unit is connected and
N/A
(Green)
registration is complete
FLASH
Ranging process is OK
Wait 60 seconds then verify cable connections and try
(0.125
resetting the Modem.
sec)
FLASH
Downstream is locked and
Wait 60 seconds then verify cable connections and try
(0.25
synchronization is OK
resetting the Modem.
sec)
FLASH
Scanning for downstream
Wait 60 seconds then verify cable connections and try
(0.5
channel
resetting the Modem.
sec)
FLASH
Modem is in boot-up stage
Wait 60 seconds then verify cable connections and try
(1.0
resetting the Modem.
sec)
Off
Error Condition
Wait 60 seconds then verify cable connections and try
resetting the Modem.
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