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Motorola SB5120 Cable Modem

Last Updated: Wed, 09 Jul 2014 > Related Articles

23 rated this

Summary

Learn about the available ports and the status lights on a Motorola SB5120 cable modem.

Solution

 


The Motorola SB5120 is a DOCSIS 2.0 cable modem.

Front View


After the cable modem has successfully registered on the network, the Power, Receive, Send, and Online lights are on and the PC/Activity light flashes when the cable modem is transferring data. Modem Lights section.

Back View


The Motorola SB5120 has the following ports available on the back of the modem:

  • Power - Connects the cable modem to the power adapter.
  • CABLE - Connects to the cable wall outlet.
  • USB - Connects to the USB port on your computer.
  • ETHERNET - Connects to the Ethernet port on your computer.

Modem Lights

The modem lights indicate the current status of your cable modem. To troubleshoot any connection problems, use the table below.

Modem LightStatusProblemSolution
PowerOffNo power.Verify power supply connections, the power switch on the modem itself, the electrical outlet, and make sure the outlet is not connected to a switch.
FlashingAn error has occurred during normal operation.Verify coaxial cable connection and try resetting the modem. If cable is ok and reset does not work, contact Customer Support.
ReceiveFlashingScanning for a receive
(downstream) channel connection
Verify all cable connections and try resetting the modem. If cable is OK and modem reset does not work, contact Customer Support.
OffNo connection cable ConnectionVerify all cable connections and try resetting the modem. If cable is OK and modem reset does not work, contact Customer Support.
SendFlashingScanning for a send (upstream)
channel connection
Verify all cable connections and try resetting the modem. If cable is OK and modem reset does not work, contact Customer Support.
OnlineFlashingScanning for the network connection.Verify all cable connections and try resetting the modem. If cable is OK and modem reset does not work, contact Customer Support.
PC/ActivityFlashingNone. Transmitting or receiving dataN/A
StandbyOnInternet service is blocked because the Standby button was pressed. If this light is on, all other lights are off.Press the Standby button.

MAC Address Label

MAC addresses are written as 12 digits containing both letters and numbers (0-9, A-F). A MAC address is unique. The first six characters of the MAC address are unique to the manufacturer of the device.

Manufacturer Resources

Modem Manual (PDF)


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