What is pure ALOHA?

It lets users transmit whenever they have data to sent.Collision may occur but due to feedback property sender can know the status of message.conflict occur when at one time more bits are transmitted.The assumptions are :

1.All frame size is same for all user.

2.Collision occur when frames are transmitted simultaneously 3.Indefinite population of no of user.

4.N=number of frames/frame time

5.It obeys poisson’s distribution if N>1 there will be collision 0<1