| Abbreviation | Definition |
|---|---|
| LDDS | Limited Distance Data Service |
| LDI | Long Distance Interconnect |
| LDL | Long Distance Link |
| LDM | Limited Distance Modem |
| LDN | Local Directory Number |
| LDPC | Low Density Parity Check |
| LDS | Local Digital Switch |
| LDS | Long Distance Service |
| LE | Line Encryption |
| LEN | Line Equipment Number |
| LES | Line Encryption System |
| LES | Local Enhanced Service |
| LET | Line Equipment Transfer |
| LETS | Line Efficiency Tracking System |
| LFACS | Loop Facility Assignment and Control System |
| LFMT | Limited Fixed Mobile Telephony |
| LFTYR | Ley Federal de Telecomunicaciones y Radiodifusión |
| LG | Line Good |
| LGE | Loop- or Ground-start Exchange |
| LGS | Loop- or Ground-start Subscriber |