The Epsilon IX Communication Research Station was an Imperial Epsilon class communications array and subspace tranciever station located in the Cron Drift. It was under the command of Commander Branch.
Although it was primarily a communications array, the station was also used similarly to the Maw Installation in that it was also a top secret research center. It's scientists had worked on the Geonosis Project, the planning and construction of the Death Star I, and by 4 ABY, had been tasked with the development of spy satellites for the Empire.
After the Empire was defeated during the pivotal Battle of Endor, the station attempted to defect to the New Republic. Dark Lady of the Sith Lumiya was dispatched by Imperial stewardess Ysanne Isard to travel to Epsilon XI and forcefully bring them back into Imperial jurisdiction. However the station was retaken by the New Republic two years later.