Over the course of five decades, TESAT has developed in-depth expertise in manufacturing payload equipment for communication satellites and has established itself as a clear European market leader. On its 60,000m² premises in Backnang, Germany, about 1,100 employees develop, assemble, integrate, and test systems and equipment for telecommunication via satellite. To date, more than 700 space projects have been completed. 
Partnership with KSAT
Since 2018, KSAT and TESAT have been cooperating to establish an optical ground segment that is vital for the development and growth of optical Direct-to-earth onboard systems. To this end, KSAT has installed the world’s first commercially available optical ground station in Greece while utilizing TESAT’s NewSpace CubeLCT terminal, which was launched in February 2021.
The next major milestone is planned for 2022 when the TOSIRIS terminal, which enables downlink speeds of up to 10Gbits, is to be installed on the ISS. KSAT also founded the European Optical Nucleus Network with the ESA and DLR to provide capacity to CCSDS O3K compatible missions which will be first used by TESAT LCT terminals. 
Article: KSAT and Tesat-Spacecom sign laser communications pact
Article: Tesat-Spacecom GmbH & Co KG