Question about Arris SURFboard® SB5101 Cable Modem

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SB5101 Modem disconnects randomly

My modem disconnects randomly. The power light stays lit, the online light goes out, and at most the send light will blink (but usually only receive blinks). I have tried turning the power off and on again, but that only works some of the time. I got it working right now by taking the coaxial cable out and putting it back in, but this doesn't always work either. The cable line is new, installed in the spring. I used to have this problem on my old one, the same model, but it was destroyed by lightning and replaced with this one. I have not had any lightning damage with this current one. Are these problems common with this modem type, or am I just unlucky enough to get two broken ones in a row?

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  • kefkasan Jul 01, 2009

    Okay, I pulled up the signal page and it says

    Frequency - 681000000 Hz
    Signal to Noise Ratio - 39.0 dB
    Power level - .07 dBmV

    I take it .07 is too low?

  • kefkasan Jul 02, 2009

    My provider is not comcast, but rather some company called Atlantic Broadband.

    When I was tinkering with the main splitter in the basement, I redid the connection and while it stays on longer now, the power has gone up to 1.0 dBmV. Will this help?



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That sounds more like a bad cable signal than a modem problem - can you get to the modem status page (It's normally visible at htpp:// - and see what the recieve signal level is?

Posted on Jul 01, 2009

  • Trimesh Jul 01, 2009

    That sounds like a really good signal - the only thing that just occured to me is that if your ISP is Comcast they were having problems pushing out the wrong config files to the SB5101 - and that did cause random disconnects.


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Using a thick quad shield cable is only good for tv cable. get new thin cable to run in youre house

Posted on Nov 25, 2009


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1 Answer

Modem(moto sb5101) stays online. all lights are solid but i get no internet. does not matter if i am going through my router or directly from modem to computer. 4 different computers(2 windows/2 macs)...

You might try uninstalling & reinstalling your network adapter. Then disconnect the power supply to your modem, reboot your computer, then reconnect the modem power supply, reboot again. The system should then recognize the adapter and restore your ability to access the internet.

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SB5101 Cable Modem ,Online light flashing,but no internet..komkast

1. call comcast to have them activate your modem
2. power cycle your modem to make it recognize your router or computer

Oct 31, 2010 | Arris SURFboard® SB5101 Cable Modem

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My Motorola sb5101 won't come online how do I troubleshoot this? My cable connection is fine. When the modem boots up the green power light comes on and stays on followed by the receive light and the send...

These modems are very tricky. When this type modem goes into stand by modem that indicates that you do have a connection to your internet service provider. The reason you cant get online is because all internet access is disabled wile the modem is in standby. If you look closely there is a button located on the top of the modem. This is the stand by button. If you hit that button it should take the modem out of stand by mode and reestablish your connection to the internet.

I hope that information above has helped is some way.
If possible please rate this solution.

Aug 02, 2010 | Arris SURFboard SB5101 Cable Modem

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Wont send

The send light will only flash when you are sending request not stay on all the time

May 09, 2010 | Arris SURFboard® SB5101 Cable Modem

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My Motorola Sb5101 modem will not let me access the internet, the send light constantly flashes and i can't attain any internet connection.

If you have the following lights :
Power light - on
Receive light - flashing
Send light - flashing
Online light - off
PC/Activity - on
Standby - off
Then your Network Access is OFF - modem is successfuly registered but Network Access Control is disabled via DOCSIS configuration file.

Call your internet service provider....

Nov 06, 2009 | Arris SURFboard SB5101 Cable Modem

1 Answer

I have blem with my motorola sb5101 cable modem, i dont have access to internet. Power light is blinkig but all other lights are on!

unplug the cable wire, as well as the power, leave unplugged for about a min. hook the power back up,, if thier is a reset button on it, push it (its probably gonna be a small pin hole some place)

Once you have done that, screw back on the cable line.
if it doesnt reset, and the power light goes and stays solid then you have some type of other issue inside your modem and you will have to buy a new one.

Nov 05, 2009 | Arris SURFboard® SB5101 Cable Modem

3 Answers

No connectivity; constant blinking LED lights "Receive" and "Send"

Or you didn't pay your subscription on time and the ISP disabled your cable modem to send user traffic over the cable network. When both Send and Receive lights are blinking that is a visual aid that the modem is working fine, but the ISP disabled its access to the network (unpaid bill, legal issues, etc.)

May 17, 2009 | Arris SURFboard SB5101 Cable Modem

2 Answers

SB5101 Motorola Modem Disconnects Randomly

If all the lights go out I would assume you mean the power light as well. Couple of things I would look at:

Has your ISP replaced the modem including the power adapter?
Has your ISP verified there is no short on the incoming data cable? You could try to wiggle the incoming data cable to see if the lights go out. I would do the same on the power cable.

If it's not a mechanical fault (cables), verify that you have the correct and current drivers for your modem and operating system.

Good luck and thanks for using FixYa.

May 12, 2009 | Arris SURFboard® SB5101 Cable Modem

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