Communications array

A communications array was a device installed on spacecraft and space stations to transmit messages through space.

When the Second Doctor, Jamie and Zoe were trapped on a space station which was entangled with an Alvarian space wyrm, the trio went to the communications array and reprogrammed it, allowing the Doctor to play music from his recorder directly into the Alvarian space wyrm's brain. The wyrm and all the snakes it controlled went to sleep. (COMIC: The Forgotten)

During the Battle of Demons Run, the Eleventh Doctor summoned a group of Dalek upgraded-Spitfires to take out the communications array of Demons Run, preventing an automatic distress call being sent to The Church fleet. (TV: A Good Man Goes to War)