Powershift transmissions connect driveshaft to the engine that is further connected to vehicle’s drive axel. The camshaft aligns a unique set of gears which aids in different gear ratios. The power obtained from vehicle’s engine remains constant generally but those gear ratios into a range of speeds for the wheels.
If you compare this powershift transmissions with the traditional manual transmission, powershift transmissions gain two camshafts along with two different sets of gears. One camshaft is harbored into other in order to manage odd numbered gears. Another camshaft is used for managing even numbered gears.