Question about Arris SURFboard SB4100 Modem

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Tryjng to unlock a Motorola Modem SB4100

I plug the USB cable turn on the modem, just two lights came on. I don't have achance to go any further.
Please help!

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  • Anonymous May 13, 2009

    same, just power light, and receive light are solid on. send light blinks, and online and activity dont even turn on

  • Anonymous May 14, 2009

    Cannot get the online or activity lights to work. they worked yesterday.

  • sergeestible May 11, 2010

    Which two lights? Are any others flashing?



    The SB4100 has 5: Power, Receive, Send, Online and Activity.



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Hi just power light on sb4100 is there any help out there

Posted on Sep 19, 2010

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1 Answer

The LED light for the ACTIVITY status did not come on for my Motorola SB4100, I can not connect to the internet, what's the problem?


It may have the wrong IP address configuration. Did anything change recently on your network or within your environment? Is the WAN port connected to your ISPs line coming into your house? I'm assuming it's plugged in and you have other light activity, i.e a Power indicator light? Also, if you plug in any computers to the LAN ports, is there activity on those ports?

Aug 13, 2011 | Arris SURFboard SB4100 Modem

1 Answer

After connecting only top two of the modems lights are on and no internet


I'm assuming one is power. The other one is a cable light, either the cable that eventually runs back to your provider or the cable to your computer or router. You need all of these cables for this to work. Double check that the modem is both plugged into the wall and a device. If it is, you need to call your provider and have them send a start signal to your modem.

Jul 15, 2011 | Arris SURFboard SB4100 Modem

2 Answers

Can this be used as a 56k router? I need to have a temporary internet connection and it is only a basic connection because of the type of phone there is at the house. We tried to connect but I don't have...


The SB4100 is a digital modem that uses cable TV network to provide broadband Internet access, it can't work with an analog telephone line, for this type of Internet access (also called switched Internet connection), you need an analog internal or external 56K modem, and also you'll need a user name and password (an account) from the Internet provider service (ISP) ; for a temporary Internet connection maybe a prepaid cellular modem (GPRS, EDGE, 3G or 4G) USB type could help you better.

Feb 27, 2011 | Arris SURFboard SB4100 Modem

1 Answer

How,do you unlock the modem motorola 4100?


is it stuck in standby? it has a standby button on it ... or log into internet explorer and in address type in 192.168.100.1 you should see the modem configuration page and the options in there ...

Dec 06, 2008 | Arris SURFboard SB4100 Modem

1 Answer

Losing connection


I assume this is a cable modem? You need to call your cable company and have a trouble ticket created. I worked for the cable company installing cable for quite a while and I bet my paycheck the signal getting to the modem are below specs and that's why the modem gets dropping the internet connection.

Hope this helps.

Aug 13, 2008 | Arris SURFboard SB4100 Modem

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