Question about Arris SURFboard SB5120 Modem

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My SB5120 modem's ONLINE light is unlit. Modem

My SB5120 modem's ONLINE light is unlit. Modem does not work. Comcast says that the modem is defective. Where can I send it for repair?

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Need to hook up Belkin G wireless router to Motorola SB5120

I have a Motorola SB5100 Cable modem and i have a belkin N wireless ROuter..i have conncted the wire from modem to router and computer to router and it doesnt work??what do i have to do??

Posted on Feb 26, 2008

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mlake33
  • 427 Answers

SOURCE: PC/Activity light

Make sure the Ethernet cable going from the modem to the computer is secure. Then go to your computers control panel and clock network connections. Look in LAN, any try to find your connection. If it isnt there , than you will need to call your ISP, and they will install it all correctly for you at no charge.

Posted on May 12, 2008

oldnovii
  • 667 Answers

SOURCE: how is Arris Telephony Modem installed?

Hi taldrich6 - You have this listed under Arris CM450. Is that what you have?

Posted on Jul 22, 2008

SOURCE: modem light flashing

If you haven't already done so, contact your cable provider and let them know what is going on. There may be a signal issue and your modem is losing its lock on the carrier.

Posted on Sep 09, 2008

  • 1 Answer

SOURCE: I have high speed internet thru Comcast and have

Push the reset button after you connect it to a new source. Its located on the back next to the Ethernet cable.

Posted on May 14, 2009

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1 Answer

I recently purchased a Netgear N600 Wireless router connected to my Comcast Motorola Surfboard SB5120 modem. I have a Comcast plan of 20 Mbps but through www.speedtest.net am consistently getting 8 Mbps...


I think its the modem that you need to upgrade. Comcast is already running on DOCSIS 3.0 system. The SB5120 modem that you have is a DOCSIS 2.0 modem. You may need to have your modem replaced with a DOCSIS 3.0 modem like the Motorola SB6120.

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I have been with Comcast for 6 years. Leasing their SB5120 modem for 3-4 years, no problem. Then bought one myself and no problem for 2 years with Negtar wireless router. For the past few days, it started...


generally a wireing issue or signal issue i assume by this time you have it fixed by the date. you can check 192.168.100.1 in a web browser and it should show the signals. if recieve is flashing then the downstream is either out of range or something else. it wont go to upstream until it locks onto downstream first.

Feb 08, 2010 | Arris SURFboard SB5120 Modem

1 Answer

I have comcast and i purchased the surfboard so that i could play use the internet for my xbox in my room. There is another modem on rent from comcast a touchstone telephony modem which provides internet...


u need a router to share internet connection, not 2 modems, from the way your explaining it im going to assume you just bought the modem went home and plugged it up, Well.. thats not going to work , your modem needs to be registered with the network your trying to access(comcast)

Jul 13, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Port Forward on Comcast Motorola SB5120


Are you just using a modem and NO router? This modem has no NAT so there is no way to open ports.

Jul 09, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Internet connection issue. Is it setup or internet service


The problem would be comcast. Your connections are setup correctly. The modems do not control the internet traffic flow, they are made to produce maximum flow.
If more people use the internet, the less flow it will have.
Check all internet options settings, and make sure EVERTHING is set to automatic

Jun 06, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Cannot set up Motorola Surfboard SB5120 modem


This usually means something is not correct with your incoming signal. If your cable wire into the modem is being run off an amplifier in the wall this could be effecting your service. If the signal is too strong the modem won't be able to communicate for internet.

You could check the incoming wire to see if it is running off an amplifier. If it is you would need to run a new line that is not on the amplifier. I would recommend comcast coming out to check the signal frequency and make the necessary adjustments.

May 04, 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

1 Answer

Comcast modem


the light is flashing because your modem is working.

Dec 05, 2008 | Arris SURFboard SB5120 Modem

1 Answer

Loss of internet connection


Sounds like a switch before the signal gets to your house. Modems usually don't go out intermittently unless they are overheating. Is the modem in a ventilated area where it can get some air? An alternate is to borrow a modem from a friend to test it. Usually one of your niehbors will have the same service and the same modem. I had my surfboard (from comcast) for 5 years and it was solid as a rock, the spotty services was always at the Comcast switches (at the street or the nearest hub.

Hope this helps

Jun 13, 2008 | Arris SURFboard SB5120 Modem

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