question on communication protocol and general help

[stdave 0]

I'm looking toward installing a security system of maybe 12 cameras, some inside, some outside. Following some advice on this forum, I am considering using this item;

 

http://in.dahuasecurity.com/in/products/ipc-hdw5431r-z-3661.html

 

for all cameras. I was considering using a PC running blue iris software.

 

What I don't know about is best communication protocol and best type of cable. I see the cameras accept tcp/ip. Would I just setup a router and run all cameras into it and then connect the router to the PC via a single ethernet line? That seems like a lot of data to a single line going into the PC. I know cameras used to run coax lines - is that better? I'm also open to running another type of platform and software also if it's more stable.

 

Some direction would be helpful. Thank you.