Question about Arris SURFboard SB5120 Modem

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Motorola SB5120 Problem with ethernet cable

For some reason when the modem was installed the guy connected it to the CPU with a USB cord. Now we are trying to set up a wireless router so we need to use the ethernet cable.

PROBLEM:
There is internet connection for a few minutes with the ethernet cable, but then it is lost completely. We can't get a connection to hold with the ethernet cable even though the network card and all other hardware is working fine. This keeps happening after several re-boots and resets of the modem. What is going on!

Thanks,

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  • Anonymous May 29, 2008

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My PC is connected to my modem with my USB. Because I had to setup up my router, I needed to go through my Ethernet port. What I discovered was that the port on the modem was damaged - pins were misaligned an ethernet cable was yanked out of the socket. I realigned the pins with a screwdriver and that worked, but it's not an ideal solution.

Posted on Jul 14, 2008

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This may sound like a cop-out lame answer but I assure you I don't think it it.

VIRUS

Specifically (if memory serves me) I believe my problem like that stemmed from a "root-kit" type of VIRUS. Swear to God this is true. I had even run an antivirus scan but it missed this problem. I dunno what OS and software you are using, but I had Windows 2000 Professional at the time and used AVAST Anti Virus (free) and it cleaned out all the lingering bad stuff. LIKE MAGIC my ETHERNET connectivity problem vanished!

You may have to do something like I did to clear it up - I downloaded AVAST on a healthy PC elsewhere and then burned it onto a CD and loaded it onto my ailing PC. 10 minutes later... ALL BETTER! :)

Good Luck,
Jo

Posted on Jan 02, 2008

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Posted on Jan 02, 2017

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Dec 12, 2010 | Computers & Internet

1 Answer

How to open settings of motorola SURFboard SB5120 modem?


Support for the Motorola SB5120, discontinued product, see next site:
http://broadband.motorola.com/consumers/support/default.asp?supportSection=DiscontinuedProducts

Connecting the device, see the "Quick Reference Guide":
http://broadband.motorola.com/consumers/products/SB5120/downloads/SB5120_Quick_Ref_Guide.pdf

For installing the modem the easiest way is to run the provided cdrom.
When not available perform the settings as showed in the guides.

Motorola 5100 series user guide:
http://broadband.motorola.com/consumers/products/SB5120/downloads/SB5120_User_Guide.pdf

See page 7 "Before You Begin" for the requirements and selecting either USB or Ethernet connection.

Page 22 gives the overview for the pages how to configure ethernet settings.

Oct 31, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Motorola SB 5120. Can I connect the USB cable to


Certainly not. You just have to choose between the two.

Sep 01, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Motorola SB 5120. Can you run the USB cable to a


Certainly you cannot. You just have to choose what connection to use. USB or Ethernet port.

Sep 01, 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

Linksys router and modem problems


Hello,

Most cable company's will not allow you to use the USB and the ethernet connection at the same time. You will need to only use ethernet to your PC and your XBOX. Once you have the ethernet cord connected from your modem to the WAN/Internet port on your router you will need to press the reset button on the back of the arris to authorise the router for access. After that is done you will plug you XBOX into 1 of the 4 numbered ports on the router. Then you will need an additional ethernet cord for your PC.

Hope this helps

Jan 04, 2009 | Arris SURFboard SB5120 Modem

1 Answer

Modem usb connection


You can only use the USB connection or the ethernet connection to get it work.  It won't work on both.  
What type of router are you using?

Sep 13, 2008 | Arris SURFboard SB5120 Modem

2 Answers

Need to hook up Belkin G wireless router to Motorola SB5120


Plug your cable line into your modem, make sure it's tight, but don't use a tool. Next plug the ethernet line from the modem to your PC ethernet port. Then plug in your power to the modem. Allow your modem to sync. Don't use the USB line at all. Do not even hook it up unless your computer doesn't have a working ethernet line. Don't run the disk either, it will only install the modem driver that is only used if you use USB.

If you have issues connecting after that, you may have to go into your ethernet adapter settings and make sure that it is using DHCP. DSL usually uses a different setting (PPP I think) and you will not be able to connect.

By the way, excellent choice in modems.

Jan 14, 2008 | Arris SB5100 SURFboard DOCSIS 2.0 Cable...

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