The Time-jump system was a piece of technology that allowed for time travel.
The device originated from the Great Machine on Epsilon III and in 2260. It was brought aboard the White Star 1 by Zathras when the ship traveled back to 2254, through the temporal rift in Sector 14. It was connected to Babylon 4's fusion reactor which allowed the station to travel a further thousand years back into the past.[1][2]