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TECHNICAL SUPPORT
Cable Modem: Motorola SB5120 Troubleshooting
► Summary
Troubleshooting
Manufacture Resources
·
Troubleshoot Modem Lights
·
Cable Modem User and Data Manuals
·
Modem Back View
·
Cable Modem Driver Location
·
MAC Address Label
► Troubleshoot Modem Lights
"Activity" light flashing
► Return to Top
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► Troubleshooting Diagram:
Modem Light
Status
Problem
Solution
Verify power supply connections and
Off
No power
electrical outlet. Also make sure the
Power
outlet is not connected to a switch.
An error has occurred
Verify coaxial cable connection and try
Flashing
during normal operation.
resetting the Modem.
Slow
Searching for cable
Verify all cable connections and try
Flashing
connection
resetting Modem.
If this is a new Modem or a replacement
Modem, the customer must contact
Fast
Suddenlink Technical Support with the
Searching for cable
Flashing
MAC address. If there are several MAC
Receive
connection
Modem
addresses on the Modem, please use the
"HFC" or "RF" MAC address. View MAC
Address Label
No connection
Verify all cable connections and try
Off
Cable connection
resetting Modem.
Scanning for the
Verify all cable connections and try
Send
Flashing
upstream frequency
resetting Modem.
Scanning for the network
Verify all cable connections and try
Online
Flashing
connection
resetting Modem.
Activity
Transmitting or receiving
Blinking
No Problem
data
► Back View
► Mac Address Label