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You have two choices to achieve your goal (which I understand is to have both you desktop plugged by Ethernet and WiFi throughout your home) :
1. The cheapest way : You need not be replacing your cable modem, but adding a router to it. There are numerous routers which are WiFi enabled. You can then plug your PC to the router and have WiFi.
2. The cleanest (but less cheap) way : There are cable modems on the market which will do the job, like the Motorola SURFboard SBG900 DOCSIS 2.0 Wireless Cable Modem. Once plugged in place of your old modem, depending on your provider, you will either have to download and install the software for your new modem (which should be prompted on your PC when you try to access the Internet), or call the provider to activate the new modem.
The trick about all this is that the software does not configure the computer, but the modem. So once it has been configured through a computer then plugged to a router, any computer plugged to the said router will have access to the Internet.
The whole process of installing/configuring will happen if you replace the old modem and/or plug a new computer directly to the modem.
RCA DCM425 digital cable modems only have one Ethernet cable located in the back of the device. In order to have two computers connected at the same time you will need to have router. The router will connect to the Ethernet port on the back of the RCA modem and then you can have up to 4 computers connected directly to the router using Ethernet cables. If any of your computers are wifi compatible they will also be able to get online by using the wifi from the router.
Your RCA DCM425 modem is just that, a modem. you need to buy and plug a wireless router into it. That will broadcast your internet connection for your playstation to find.
Because the cable-modem has an RJ-45 ("Ethernet") output-port,
and because any router has an Ethernet WAN ("Wide Area Network") input-port, any router will do ("wired-only" or "wired-plus-wireless").\
First try connection the Yellow ethernet cable from the rca modem to your computer's network connection. If you get a connection this way, then your modem will work with a ethernet cable. If not, then call Comcast for help. The modem ethernet out to computer port must be connected to the wan line of the router. Then you can connect an ethernet cable from your computer network connection to one of the 4 ports of the router. For wireless connections you must set up the router and wireless adaptor with the same settings to connect. Follow the routers directions.
Good Luck
This RCA DCM 425 is a cable modem only its not even a router, its just a plain cable modem that is being provided by some cable company like Cox and Comcast, try searching again for a different box there they have a brnad name of Linksys, Netgear or Dlink because those are the common manufacturer of wireless router ...
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