| Acronym | Meaning |
| UDB | Update Buffer |
| CADS | Command And Data Simulator |
| MS | Margin Of Safety |
| CICU | Communication Interface Control Unit |
| SEOS | Synchronous Earth Observation Satellite |
| NUL | Non-GSE Utilization List |
| DNO | Descending Node Orbit |
| CUIL | COmmon Usage Item List |
| DAE | Data Acquisition EquiPment |
| CECP | Compatibility Engineering Change Proposal |