A Vulcan band frequency was a type of communications frequency employed by the Vulcans during the 24th century. In 2369, the Vulcan science vessel the T'Vran contacted the Starfleet runabout USS Ganges in the Gamma Quadrant on a Vulcan band frequency asking if Odo, Croden and Yareth needed assistance after their turbulent encounter with Ah-Kel in the Chamra Vortex. (DS9: "Vortex")