Question about RCA Thomson Digital Cable Modem (DCM305R)

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Ethernet vs. usb

I have a Thomson TCB Cable modem and when I connect via the usb connection, I get a 12MBps connection. When I plug in the ethernet connection, it tells me that I have 100MBps, but that there is limited or no connectivity. Also, when I'm plugged in via the usb connection, my router won't recognize the modem.

Is there something I can do to get the modem to utilize the ethernet connection?

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  • Jcraw Mar 09, 2008

    I had Comcast Cable Modem (RCA/Thomson DHG535-2) installed by their technician who used the ethernet port to connect to the internet.



    I installed the USB cable and Comcast software he left me. This frees up the Ehternet port on the Modem, so I can use for my home network .



    I use a static non-routable IP address (192.168.0.2) on my NIC. When trying to access the Internet via the USB connection, it cannot connect unless I disconnect the patch cable running from the Modem's Ethernet port to my computer (NIC).

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FYI for those people trying to use a ethernet and usb cable from a cable modem - it may work for a while but it won't work forever - your ISP will only allow one IP address out of the modem unless you pay for additional addresses (then you need a switch). Each device you have on the modem is fighting for that IP and eventually it will just quit working (if it works at all).

If you want more than one computer on your network (on the Internet or sharing printers/files, etc) then you need a router or a gateway (cable modem/router combo which I DON'T recommend).

Posted on Sep 29, 2008

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I think whats happerning here is that your PC is not getting packets if you have a Win" PC go to CMD type in:

ipconfig /release

(this will cut your internet connetion off)

then do this

ipconfig /renew

(this will start your internet back up) enjoy

Posted on Nov 27, 2008

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Try unplugging modem and router, then wait 3-4 minutes. Plug modem in, wait for it to acquire signal, then connect ethernet cable to WAN port on router, then plug it in. Connect ethernet from router to PC, and turn PC on. Everything should work fine.

Posted on Feb 09, 2008

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You're wanting to plug the modem into your router via the ethernet cable, correct? I've run into cable modems that don't like to use ethernet after the USB port has been used. In cases like this, I have to do a soft reset of the modem and things usually work again. Plug the modem into the router via the ethernet cable then do a soft reset.

To do a soft reset, do the following:

  1. pull the power cord from the modem
  2. count to 5
  3. hold down the power button on the modem
  4. plug back in the power
  5. count to 30 while holding the power button (the modem should be blinking a lot)
  6. release the power button and see what happens.

Posted on Feb 09, 2008

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I am having a connection problem with the rca dhg535 modem. I have two computers and one computer only has an ethernet port and the other has ethernet and a high speed usb port. I loaded the drivers for the usb port on the one computer and I have it connected fine to the modem, everything works, but when I connect my other computer to the modem with the ethernet cord I get a no connectivity. I was wondering if there is a way to run both computers off the modem without a router.

Posted on Aug 25, 2008

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Cmment utuliser ce modem


  1. Save your work and shut down your PC.
  2. Connect the coaxial cable from the coaxial jack in your wall to the coaxial port on the rear of the modem. Turn the connector clockwise until the cable is firmly connected to the modem. Gently tug on it to make sure it is connected.
  3. Connect the appropriate cable, USB or Ethernet to the matching jack on the rear of the modem. Connect the other end of the cable to the appropriate port on your computer.
  4. Connect the modem's power adapter to a surge suppressor or a dependable wall socket.
  5. Press the power switch on the front of the modem to turn it on. Power up your PC. If you opted to use the USB connection method, you may have to install the appropriate drivers. Check your owner's manual for specifics.
  6. Launch your web browser http://192.xxx.xxx to verify Internet access.

Dec 04, 2010 | RCA Thomson Digital Cable Modem (DCM305R)

1 Answer

I have a RCA Thomson DHG 535-2 without the disk for the installation and the ethernet wont help everything is hooked up etherent/cable to tv power yes... and that's about ti all im really missing is the...


Thomson Cable modem has an ethernet connection...
The ethernet connection goes to your computer via a standard Cat5e patch cable. There is no USB that I know of...
Cablevision wire goes to the modem. It should be the first device on the cablevision wire. If you need a splitter, it needs to be a GOOD one, connected DIRECTLY to the incoming Cablevision wire as it enters the house. Use good copper wire.

Order of events:
Connect the cablevision wire to the Modem.
Connect the Ethernet cable to the computer and the modem.
Power on the cable modem.
Right click the network Icon near the clock and click 'repair' (Or reboot the computer)
Apply for and get an account for cable Internet from your Cable company.
After a few days, cable Internet should work.

Apr 16, 2010 | RCA Thomson Digital Cable Modem (DCM305R)

1 Answer

I lost the disk for the RCA DCM425 digital cable modem the cable company gave me. how can i get the modem to work on my new computer?


Hello Friend,
If you didn't change anything in modem side, that means the modem is still connected to internet. in this case you can connect the modem to your computer via the Ethernet cable. with this cable you will not need to install anything on your computer, just plug the Ethernet cable to the RJ45 port and start browsing internet.
The only case when you will need the drivers is when you want to connect the modem to your PC via USB cable.
Here is a link where you can find everything about your modem: quick guide, user manual, usb drivers ...
Best Regards,

Oct 30, 2009 | RCA DCM425 DIGITAL CABLE MODEM (RCADCM425)

2 Answers

How can i connect an additional pc to my rca dcm245 cable modem? i have an ethernet hub.


Hi there.
What you have to do is plug in the Ethernet hub, run the Ethernet cable (RJ45) from the modem to the "internet in" or "internet" socket on the hub, it will the one which is separated from the others.
Then connect an ethernet cable in port 1 to your first computer and a cable from port 2 to your second computer and so on.
If you experience connection problems just pull power from the modem for 30 seconds, plug it back in wait a minute and reconnect.
If you would need further assistance please post back.

Good luck and thanks for using FixYa!!

May 25, 2009 | Thomson RCA DCM245R Modem

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Motorola surfboard sb5101 only gives me a connection speed of 12Mbs. Can I get more?


if you use the usb cable can only be sure your connection is 12Mbps, try to use lan cable that you certainly can. I also use the usb only 12Mbps, but can I use lan cable I can be more than that

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Connecting modem via ethernet cable


I'm not an expert in window based units but since it worked with Vista OS and not with XP. Sounds like you might try re-installing XP again. Take note on any windows that refer to the ethernet port during installation. It is likely you might of hit "next" without reading all the text. I know I have in the past. I changed over to mac and I know longer have any problems only at work but give then I give it to the IT Dept and wait and wait and wait.

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Just plug the cable modem ethernet into the input to your router and you will be fine. Just remember, if you decide you want to make any changes to your router settings through your browser, make sure you hook up an ethernet line from your laptop to the router before making any changes. The reason for this is if you make a change in security settings on your router while wireless, the router will reboot and if your laptop did have the settings changed in it, you can be locked out.
Not that you can't get back in, but it is a pain to have to do.

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Can't get modem to work if I use the USB connection


Your computer is attempting to find the network connection through your LAN port. Your best bet is to reconfigure your network settings to seek its external network connection through USB, or better still, obtain a router(I personally recommend linksys wireless/basic routers due to stability), and simply use the ethernet connection through it. While this is bypassing the initial issue, it is also saving yourself a lot of hassle when it comes to retooling the PC's settings on the USB connection.

Jun 04, 2007 | RCA Thomson Digital Cable Modem (DCM305R)

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