| Acronym | Meaning |
 | IAS | Integrated Avionics System |
| O-NAV | Onboard Navigation |
| PM | PMATPage Map Address Table |
| SMD | Special Measuring Service |
| PPS | Pulse Per Second |
| RCP | Right Circular Polarization |
| BP | C/SCounts Per Second |
| MTU | Master Timing Unit |
| IGSE | In-Space Ground SUPPort Equipment |
| LC | Intercom (Orbiter To Ground Via Hardline) |
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