TELETEL has been awarded with a new contract (GSTP Element-1) in the field of Time Sensitive Networking (TSN) / Time-Triggered Ethernet (TTE) on-board data networks. Capitalising on relevant previous activities and products (i.e. iSAFT TTEthernet Verification-SPY Tool), TELETEL, in co-operation with Airbus Defence & Space (ADS) Toulouse, will perform a de-risk activity having as an objective to design, develop and validate a modular TTE/TSN Test Tool supporting End System simulation, traffic generation & fault injection functionalities based on open TTE/TSN standards and according to space mission EGSE requirements. The results of the activity will be available in Q3 2020.