The wormhole relay station was a subspace relay station that allowed communications from the Alpha Quadrant to pass through the Bajoran wormhole into many universes during the war. Although communications through the wormhole were possible, it was unreliable and required the wormhole to be open while the transmissions occurred. Some attempts were made to produce a reliable communications network that traversed the wormhole, but due to the wormhole's high interference, which consisted of unstable subspace carrier waves and high phase variances, the signal was not strong enough to pass through.