| Abbreviation | Definition |
|---|---|
| TIMS | Telephone Information Management System |
| TIMS | Transmission Impairment Measuring Set |
| TINA | Telecommunications Information Networking Architecture |
| TIND | Telecommunications In New Developments |
| TIO | Telecommunication Industry Ombudsman |
| TIO | Telecommunications Industry Ombudsmans |
| TIP | Telecom Infra Project |
| TIP | Telecommunications Infrastructure Planning |
| TIRAP | Telecommunications Industry Registered Apprenticeship Program |
| TIRF | Telecoms Industry Regulatory Forum |
| TIRKS | Trunk Integrated Records Keeping System |
| TISM | Telecommunication Information Studies and Media |
| TJB | Telephone Junction Box |
| TKIP | Temporal Key Integrity Protocol |
| TL | Telephone Lead |
| TL1 | Transaction Language One |
| TLBC | Telebec |
| TLC | Telecommunication Link Controller |
| TLC | Text Link Cellular |
| TLC | Transparent Line Control |