| Acronym | Meaning |
 | HITS | High Rate Multiplexer InPut/Output Test System |
 | OAS | Office Automation System |
 | SEND | Shared Equipment Need Date |
 | MEP | Minimum Entry Point |
 | PAM | Pulse Amplitude Modulation |
 | CR | Card Reader |
 | RSD | Requirements And Specifications Document |
 | ISS | Inertial Subsystem |
 | BACS | Body Axis Coordinate System |
 | FSSR | Functional Subsystem Software Requirements |