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This modem is USB or Ethernet. I strongly reccomend using the ethernet and not the USB option as USB will lose some speed.
An ethernet cable is a standard RJ45 Jack'd cable (both ends) - check google images if unsure but you'll see the plug in the modem that is the same as one on your laptop.
If you dont have an ethernet port on your laptop (possible but unlikely) then you'll have to use the USB option - this is a usb cable similar to a printer usb cable (square usb end at the modem and flat usb to the laptop)
Most of the time on laptops if there is no phone input for a modem you cannot just plug in and dial up. The process i use at home for my pc is dialing through my cell phone. If your carrier will allow you to tether your phone without extra charges check your phone manufacturers website for modem software. You then just connect your phone through a usb cable and set a internet connection matching your carriers instructions. Another solution is dificult without networking knowledge but you can set up a home pc with a wireless antennae as a ad-hoc server through internet connection sharing and then allow your laptop to connect through the "server" pc.
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.
If you are using Windows Xp, just connect the modem using USB/LAN it will be automatically detected & software for it will be installed. Then you can just set up a connection, put in your username & password, done.
If you are using Windows Vista / Windows 7, modem in LAN mode will be installed automatically like XP, but not in USB mode. Because there's no USB driver for UT300R2U (BSNL modem) in Vista. You need to find a ZTE Remote NDIS device driver, install it & then you can connect. Hope this will fix your problem.
The easiest solution would be to use an ethernet connection. A second problem is probably on most cable modems you can either use a USB connection OR an ethernet connection you cannoot use both at the same time.