Question about Arris SURFboard SB5101U DOCSIS 2.0 Cable Modem - RoHS

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When i reset my modem it goes through the normal start up process but when it is trying to connect online the lights start flashing.(receive &send ) lights flash.

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The light pattern you have described shows that the modem can not establish a connection to your internet service provider (ISP). This is typically do to a signal related issue. To trouble shoot the problem you will need to connect the modem directly to the main cable line where it first enters into the home. You will know when the modem establishes a connection by the top 4 lights becoming solid green. If at any point all 4 top green lights start to blink in sequence than you will need to contact your internet service provider to "unwall the modem". Remember most internet service providers require you to register new modems on there network. So if you have not all ready completed that process you will most likely not have access. If you can not get a connection from the main line than there is a issue with either the modem or the signal coming into the home and you will need to contact your internet service provider.

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

Posted on Sep 01, 2010

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Sb4200 modem standby problem


This isn't much help, but be aware that this is an old modem, so no surprise that Arris cannot help with it. The process you describe sounds like what I just went through with a BRAND NEW Arris DG860A modem. The modem is going through the boot-up process normally when it cycles through "power, receive, online, send". Mine did the same thing. But without more info, I don't know if the rest will apply to your modem. In the case of the DG860A, which was owned by me, Comcast technicians both online and in-person could not get it to authorize on the Comcast network. Even though Comcast replaced my DG860 with their DG860, it is believed that my model did not have the Comcast generated code needed for authorization, and for some reason would not accept it.
So in short, if this is a new modem installation of an older modem, it may be lacking a piece of code necessary for the network to authorize it.

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I cannot access the router settings.The light keeps flashing green.I cannot manually set up my settings.It said the setup was a success, but later when I was setting the router settings it told me I lost...


Flashing green means its trying to contact the modem. So, there is some problem with modem-router connection or with the modem.

Disconnect the modem from the router and connect the modem alonely to the desktop and check.

If you are unable to go online, restart the modem/reset the modem.

After that, connect the modem to the router, then reset the router (In the back side, U can see a reset button. Hold the button upto 10-15 seconds, lights will go off and it will vary). then, power off the router and after 10 sec, make it on.

Then it will go to default settings. Now, try to go online.

If not, Call Belkin 1800 2BELKIN. Life time Free phone support 24*7.

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Receive and send lights keep flashing and no connection can be obtained


Reset the modem by removing the power for at least 45 seconds,try to get online.
If you have a router, reset that also. Modem first, then router,in sequence.

Check the cable going to the modem for any cuts or connector is loose.

If it still won't work ,replace the cable.

Lastly, call your Internet provider.

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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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Sometimes if there is a power surge or some other issue it may lose connectivity. The important thing when turning everything on is that you do it in the proper order. You should power the router, your computers, and your modem completely off. First, plug in your modem and let it completely boot up. After that, plug in your router. When that is completely up (all lights are on), start up your computer and try again to be online. Please view my how-to on how to set up and reset your WRT54G router for more information on this process.

http://www.fixya.com/support/r3995607-setting_up_or_resetting_linksys_wrt54g

Good Luck,

NOLA Tech

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If the 'online' light is off, that means that you no longer are receiving a digital signal from your cable company. The first thing to try is a hard reset of the modem. Unplug the modem for about 15 seconds and plug it in again. In about 1 minute, the lights should be on again and everything should be working. If not, you will need to contact your cable company to have them fix the problem (normally resetting a device on their end).

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Online Flashing - Scanning for a network connection.
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Im having problems getting my modem to get online. The light wont come on. All but the online light come on. The online light blinks then all the lights go off except the power light, and the receive...


Your modem is not synching. It could be a number of possibilities, and you're going to have to do some troubleshooting to narrow it down.
  • Verify that your AC, Cat 5, & ethernet cables are connected securly
  • Verify that your modem is not in "standby" mode
  • Power cycle your modem
  • Try a different cable outlet
  • Call your ISP to make sure your modem is provisioned and your service is set up for cable internet.

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