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 thoughts on “Cable Modem Troubleshooting: Motorola SB4220”

  1. Pingback: Cable Modem Index - Simplehelp

  2. 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.

  3. 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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