Cable Modem Troubleshooting: Motorola SB4220

Light patterns, images, manuals and more helpful info for the Motorola SB4220 cable modem –

Manufacturer: Motorola Model: SB4220
Modem Light Indicators

Flashing – Startup diagnostics in progress.
On – Cable modem is powered on.


Flashing – Scanning for a downstream channel.
On – Downstream channel is connected.

Send Flashing – Scanning for an upstream channel.
On – Upstream channel is connected.

Flashing – Scanning for a network connection.
On – Startup process complete. Modem aqcuired.


Flashing or On – Transmitting or receiving data.


This light turns on when the standby button is pressed and standby
mode is activated.
Notes and Useful Information:

This modem has a standby button located on the top of the unit. When activated, the LED lights turn off (except the standby LED) indicating the ethernet and usb ports are disabled. Note: The cable connection to the service provider remains active.

Installation and User Manual (Requires Adobe Acrobat
Motorola Product Website

{ 4 comments… add one }
  • urvaksh December 23, 2006, 10:41 am

    I have a Motorola Surfboard modem. Is there a way I put the Modem into/out of standby, without having to press the button.
    Is there like a sleep feature, which puts it into standy after a certain amount of minutes.

  • Joseph September 13, 2008, 5:23 pm

    i am tech support guy, some times my customers says the Pc activity lights turns Orange instead of the solid green what might be the issue..

  • wissem January 9, 2010, 1:10 pm

    j’ai un modeme mais je ne sait pas son utilitee
    est ce qu’il joue le rolle d’un respteur parabolique ou quelque chose comme ca ?
    merci d’avance

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