Question about Arris SURFboard SB5120 Modem

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All Lights are on...

I have cox cable and using a Motorola SB5120 modem. I have lost internet connection. When trying to reset(unplugging power supply & repowering)the modem, The power light comes on then PC activity light comes on. Nothing else happens. Wow..I too have this issue and it started about two weeks ago. I can reset the modem and it works for a while and then cuts out again...

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If the Cable light does not come on and/or the Activity light doesn't turn on, there is a problem with the plant equipment and you need to contact your provider to fix it. It could be a cabling issue outside of the residence or something could be down at the plant itself. This can also happen when the temperatures rise or if there is condensation inside the cable as it causes signal loss and increased noise on the line.

Posted on May 31, 2009

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Related Questions:

1 Answer

I have a motorola SB5120 modem but no disc for it.How can I make it work?


With this type of modem no type of software will be required to establish a connection to your computer or router. However the modem will still need to be registered with your internet service provider. If you do not have the software to complete the registration process you will need to contact your ISP. The good news is that the registration of the modem should not take more than a few minutes and can be performed over the phone. After the registration has been completed connect the modem to your computer via a Ethernet cable. You may need to perform a hard reset of the modem at this time. To do this turn off your computer and unplug the power cable from your modem. Wait 2 minutes and reconnect the modems power cable. Give the modem another 2 to 5 minutes to reestablish the connection to your ISP. Power back on the computer and you should have internet access.

I hope the information above has helped in some way.

Aug 11, 2010 | Arris SURFboard SB5120 Modem

1 Answer

When i turnt on all lights stay on


You need to check with your internet provider, sometime they can reboot your modem from there office. Also try unplugging and re-plugging in the modem. Additionally try hitting the reset button on top of the modem. Hope the was helpful:)

Jul 22, 2010 | Arris SURFboard SB5120 Modem

1 Answer

Cox says my SB5120 is resetting 12 pulse times a


May be firmware get corrupted due to power-cut or an excess voltage or surge problem.
At times when there is thunder-storm a lot of excess volatge is generated on the phone wire which is link down to the modem
Ok
try to download recent firmware from manufacturer and see if it can be updated.
Cheers
Uttam

Jan 14, 2010 | Arris SURFboard SB5120 Modem

1 Answer

How to reset moorola modem sb1520 surfboard


hi, to reset the modem follow these steps.

step 1 : Turn the Motorola Surfboard SB5120 Cable Modem so that the back of it is accessible to you. There's no need to disconnect any of the cables.

step 2 : Find the "Reset" button on the modem. It's a small recessed button located between the USB port and the cable outlet.

step 3: Use a pointed instrument to push the button. Hold it for 10 to15 seconds to allow time for the modem's indicator lights to go off.

step 4 : Release the Reset button. The lights will gradually begin to come on as the modem connects to the communications channels between the cable provider, the computer and the Internet provider. When all the connections are made, the lights will stablize.

step 5 : Release the Reset button. The lights will gradually begin to come on as the modem connects to the communications channels between the cable provider, the computer and the Internet provider. When all the connections are made, the lights will stablize.

Nov 22, 2009 | Arris SURFboard SB5120 Modem

1 Answer

When I press standby button the standby led doesn't turn on


First, make sure you have an internet connection. If so, shut down the modem. Pull out the power cable and Coax cable from the back of the modem. Then first put the power cable in, then the coax cable and then turn on the unit. Restart your computer to verify a connection. Then try to press the standby button. If this doesn't work call your internet provider and they can reset the modem remotely for you.
Good Luck.

Jul 08, 2009 | Arris SURFboard SB5120 Modem

1 Answer

The power light and PC activity light are the only lights that come on. Send/Receive lights don't blink.


the most easy way to connect to the internet is get a bluetooth connetion (zippys) press the tools find device on the bluetooth on ur phone press pair device and press dial up inthe username put ur mobile number and password mobile number dial up number *99# dial

Apr 28, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Wireless router stops internet connection to modem during install


are you sure your hooking the comcast modem in the right place?

Feb 08, 2009 | Arris SURFboard SB5120 Modem

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