| Acronym | Meaning |
| ACTA | America's Carriers Telecommunications Association |
| DCE | Data Communications Equipment |
| CIR | Committed Information Rate |
| AC | Alternating Current |
| HD | Hard Drive |
| I/O | Input/Output |
| CASE | Computer-Aided Software Engineering |
| CHAP | Challenge Handshake Authentication Protocol |
| AMPS | Advanced Mobile Phone System |
| DCC | Direct Cable Connection |