Vulcan band frequency
A Vulcan band frequency was a type of communications frequency employed by the Vulcans during the 24th century.

In 2369, the science vessel T'Vran contacted the Starfleet runabout  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. ()

Band frequency
Communications technology