Cable Modem Troubleshooting: Motorola SB4100

Light patterns, images, manuals and more helpful info for the Motorola SB5100 cable modem –

Manufacturer: Motorola Model: SB4100
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.

Notes and Useful Information:

This modem has a standby button located near the logo on the front panel.
When activated, the LED lights turn off 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)

Product Website

9 thoughts on “Cable Modem Troubleshooting: Motorola SB4100”

  1. Pingback: Simplehelp » Cable Modem Index

  2. I have a problem, the power light never stop flashing :s and i dontknow what to do, its not connected to the pc, its AC only, hope u can help me ._.

  3. i have this problem…

    someone changed the mac address too many times and now my modem is loocked ..

    it cant be detected by pc’s through USB or Ethernet

    i just can use it on XBOX360..

    i need some help plz !!!

  4. I have one problem, when y connect my modem, power light starts normaly but 3 segs passed, and receive and send leds flash at the same time… i mean they turn on at same time, like when modem restarts…

    i dunno wut to do…

  5. Pingback: Motorola Sb4100 Cable Modem « cokulihak

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