Subspace relays were platforms designed to receive subspace communications and relay them to other stations as part of a subspace relay network. They were a necessary component in interstellar communications due to the vast distances involved.
By 2100, a network of subspace relay stations had been established throughout the Sol system, permitting real-time communications (or at least with acceptable delays). (The Starfleet Museum)
During the Dominion War, the Federation and Dominion fought over control of the subspace relay on AR-558 for several months. (DS9: "The Siege of AR-559")
External link[]
- Subspace relay article at Memory Alpha, the canon Star Trek wiki.