TELETEL has been awarded with a new contract (GSTP Element-2) in the field of SpaceFibre on-board data networks. Specifically, an integrated validation solution for SpaceFibre networks will be developed, supporting different operations including simulation, monitoring, traffic generation, fault injection etc. The iSAFT SpaceFibre Test Tool will be an advanced Data Front End with traffic generation capabilities that simulates SpaceFibre devices or Instruments, enabling S/C integration tests before the availability of Flight Models. It will also constitute a high performing, modern network traffic capture, recording and analysis tool for the validation of satellite/spacecraft on-board communication protocols and data networks implementing the SpaceFibre protocol family. The test tool will be based on the iSAFT SpaceFibre PCIe Interface board.