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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Posted on Jan 02, 2017

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