Portal 1

Federation portal 1 was a Federation Starfleet space station that replaced Deep Space 9 at the entrance to the Bajoran wormhole by the 31st century.

When a Starfleet vessel in the Gamma Quadrant experienced a transwarp drive explosion, the crew tried to reach Federation portal 1 to ensure the survival of the Dax symbiont, whose host had died in the explosion. (SS ST (The Law of Averages))