Starfleet Academy Courses. Subspace communication: Subspace communication, subspace radio, or hyperchannel, is the primary form of electromagnetic communication used throughout the Federation. By transmission of a subspace radio signal, which travels through subspace rather than normal space, subspace communication permit the sending of data and messages across interstellar distances faster than the speed of light. Consult: TNG: "The Ensigns of Command"; VOY: "The 37's", etc. Star Trek Starfleet

Starfleet Academy Courses. Subspace Communication: The speed of subspace messages varies considerably depending on the technology used. For example, in the 2260s, a subspace message from the Romulan Neutral Zone took three weeks to reach Starfleet Headquarters, while a century later, at the same distance, subspace communications were virtually real-time. See: TOS: "Balance of Terror," Star Trek Nemesis. Star Trek Starfleet Command | Starfleet Academy