My basement drain is backed up.

I have a basement floor drain (french drain?) that is a open 4" hole reducing to a 2" pipe going straight down. This pipe stops or is blocked 6" down. This drain has four 3" clay horizital pipes opening into it's mouth. Each clay horz. pipe is coming from one of the four corners of the basment (it looks like). All four of these clay pipes has a slow flow of water into the down pipe.

Questions; How does this system drain? Should I force an opening in the 2" down pipe? Is one of the four clay pipes the out flow? Where should the water go?

Thanks