A subspace transmission was a type of subspace communication that was unidirectional.

During a conversation with the Bajoran Sirco Ch'Ano in 2369, Nog scrambled the subspace transmission by using an engineering tool so visual communication was impossible. Sirco believed that a subspace interference affected the signal. (DS9: "Progress")

After Odo established a subspace link to Kora II for medical records, Jadzia Dax informed him that Gul Dukat had responded to Odo's earlier subspace transmission requesting his attention. (DS9: "Duet")

In 2370, after Gul Dukat had been kidnapped, Kira Nerys received a signal on Deep Space 9 from somewhere in the Demilitarized Zone from a group taking credit for the kidnapping, and calling themselves the Maquis. (DS9: "The Maquis, Part I")

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