| Acronym | Meaning |
 | LOB | Line Of Balance |
| POP | Preflight Operations Procedures |
| FSK | Frequency Shift Keyed (Keying) |
| OIS | Operational Intercommunication System |
| BP | Closed Loop |
| HRM | High-rate Multiplexer |
| L-L | Line-to-Line |
| OFTDS | Orbital Flight Test Data System |
| SIS | SAIL Interface System |
| EAM | Electrical Accounting Machine |
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