Question about Arris SB5100 SURFboard DOCSIS 2.0 Cable Modem (50120900100)

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I have internet in my house but my modem is not working it goes to online then it goes back to recive can you help me fix this problem please

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That would be a cable issue- either replace the cable that is going into your cable modem or call your cable company to fix problem.

Posted on Apr 07, 2009

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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.

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Have you tried unplugging the modem's power cord for at least a couple of minutes? If that doesn't work, have you called your ISP? The problem could be anything from a billing issue to an outage in your area, to a modem that needs to be replaced. Your internet service provider would be the best place to (try to) find help.

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Sounds like it is the modem. The TV does not use the modem. The line comes into the house and goes to a seperate TV box.

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if you are using a splitter from the phone jack please make sure it is properly seated.

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1 Answer

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Make sure that you have the ethernet cord from your modem plugged into the WAN/Internet port on your router. Then unplug the power cord from your cable modem and plug it right back in. After the modem fully comes back online, unplug the power cord on the wireless router and plug it back in. wait 30 - 60 sec and then try and connect.

Most cable companies only allow one active"CPE" at a time for internet access. All this means is when you change what is connected to the cable modem you must always reboot the cable modem to allow access.


Hope this helps. Let me know if it does not work.

Please Rate

Jan 29, 2009 | Arris SB5100 SURFboard DOCSIS 2.0 Cable...

1 Answer

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Check with your server.The registration details have been deleted.

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1 Answer

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you should call the cable company for a service call... sounds like signal issues.

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1 Answer

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I think your modem needs to be configure by your ISP.
I change my modem here in my house with other brand and did'nt work, so i put the original modem i used and it works again..

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1 Answer

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Your cable signal is low.If you have any splitters remove them.there is only one single cable that should go to the modem out to the box on the house then inside the box the cable for the modem should be on a 2 way splitter, the input is from the cable service, one output goes directly to the modem and the other output usaully goes to another splitter that runs the rest of the TVs in the house.basically the modem needs "priority" or first dibs on the bandwidth coming to the house.

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