The guy who attacked Pacman Jones -- and then got his ASS KICKED by the NFL star -- has just been sentenced to 1 year behind bars ... court officials tell TMZ Sports.
We broke the story ... Jones was walking through the Atlanta International Airport on July 10th when Frank Ragin -- a man who worked at the terminal -- started talking trash to the NFL star.
Ragin shoved Jones into a wall and then the two began to fistfight -- with Jones knocking the guy out with a wild overhand right.