| Acronym | Meaning |
 | DCS | Digital Command System (Subsystem) |
| HDR | High Data Rate |
| MPR | Management Program Review |
| HCSI | Hughes Communications Services |
| VSO | Very Stable Oscillator |
| SEAID | SuPport Equipment Abbreviated Items Description |
| SE&I | SYstems Engineering And Integration |
| MW | Mmw Microwave |
| MT | Mount |
| PTDDSS | PTD Data Selection Sheet |
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