[¦kā‚band ¦siŋ·gəl ′ak‚ses ‚sər·vəs] (communications) A service provided by the Tracking and Data Relay Satellite System, with return-link data rates up to 300 and 800 megabits per second for the Ku and Ka bands, respectively, and forward-link data at 25 megabits per second in both bands. Abbreviated KSA.