House-Keeping and science telemetry data from the satellite are recorded in the MMFU to be transmitted to ground via X Band, and Ka Band subsystems.
The X Band subsystem provides a Direct Data Broadcast (DDB) permanent service through a single radio frequency (RF) link, whereas the Ka Band subsystem provides a Stored Mission Data (SMD) intermittent service through two RF links.
During the Assembly, Integration and Test (AIT) phase, a payload Electrical Ground Support Equipment (EGSE) receives the RF data, demodulate it, and forward it to the MMFU SCOE for recording and post-processing.
In charge of data distribution to the instrument EGSE, the MMFU SCOE can be operated remotely by a Central Checkout System (CCS), or locally via the MMI for configuration, maintenance and test debugging.