Question... does a coaxial cable deliver both TV and internet data at the same time? if i'm using the coaxial cable for watching TV would i able to connect it to a modem get internet from it... If i'm paying for internet service?

Buy a splitter for the coax and do both at the same time. Yes, they both come down at the same time.

crazy technology.

Yes! and no. The data and video signals are carried on the same wire. However, the Cable Modem has to be provisioned by your cable company in order for it to work, it won’t just work by plugging it in. They need to know its there to provision it so you can get an IP address and they can put you in billing. Actually, it’s quite the reverse, codes on the billing system push the configuration to your modem and allow your cable modem to function.

Cable is called “Broadband” because the full spectrum of radio frequencies passes through it. It’s more than capable of pushing hundreds of digital channels, cable modem data, and phone calls. In fact, if you take a 250Mhz chunk of spectrum from 500Mhz to 750Mhz divide it into 6Mhz chunks (a “channel” is 6Mhz wide) and encode each one of those with 256QAM encoding, it’s near 1.7 gigabits a second of data on the downstream side!

Regarding one of the comments here, I highly recommend NOT buying a splitter and having someone come out (it’s usually free) to install the thing. There are two bad things that can happen if you DIY.

1.) Your splitter or cable isn’t rated beyond 500Mhz. This isn’t a problem if the data carrier is here or below, but it’s rare. You might have serious problems if this is the case. It may work, but poorly. If you still want to DIY, you can usually pick up the right parts at the local cable office for free or at a low cost.

2.) Your in-home wiring is already at a point where it’s split so much that the signal is too low. An amplifier MAY fix this, but it’s a sweet science on installing it. You want your cable modem to have the best signal possible (closest to 0 actually) so it’s not screaming on the upstream and constantly ranging to find the downstream channel. This can cause problems with your neighbors equipment, your own equipment, and can cause spotty internet access.

Anyway, enough of the rant.