Im need to connect about 20 cameras on a property. Ive worked with cameras but only with rg59-u cable. The distances are far greater now and I know I need to use CAT5. How does this work? an entire CAT5 cable for each camera? The bnc converter only brings for two slots? and the cat5 has i think 5 or 6 threads? how does this work? does the power run through there aswell?

Thanks

Video on UTP (usually Cat-5) needs 1 pair per camera. You could send video from 4 cameras on one 4-pair Cat-5 cable. For most purposes, use separate power cable 18/2 or better (depending on distance).

There are multi-port baluns available. Most cost effective would probably be using 5 4-camera baluns in which you use one pair for each camera.