Wide-band subspace

From Memory Alpha, the free Star Trek reference

Wide-band subspace is a type of subspace signal used to communicate when one's hails have been ignored or visual contact is not possible. It is a band generally received by most starships.

In 2372, Captain Kathryn Janeway used a wide-band subspace signal to communicate with the Pralor Automated Personnel Units, which had abducted B'Elanna Torres and refused to acknowledge hail requests. (VOY: "Prototype")

Subspace communication
amplifier • antenna • bandwidth • beacon • hyper- • interference • interplexing beacon • log • message • neural transceiver • oscillation • relay • relay network • relay station • transceiver • transmitter • transponder • wide-band