| Abbreviation | Definition |
|---|---|
| LOS | Loss Of Session |
| LOS | Loss Of Signal |
| LOSW | Loss Of Synchronous Word |
| LP | Line Pair |
| LPDP | Local Policy Decision Point |
| LPU | Line Protection Unit |
| LQC | Line Quality Control |
| LQD | Line Quality Disturbance |
| LQE | Line Quality Engineering |
| LQF | Line Quality Function |
| LQI | Line Quality Indicator |
| LQM | Liên Quân Mobile |
| LQM | Line Quality Management |
| LQM | Line Quality Operation |
| LQN | Line Quality Network |
| LQO | Line Quality Operation |
| LQR | Line Quality Report |
| LR | Line Rate |
| LRB | Loop Reverse Battery |
| LRM | Long Reach Multi-mode |