| Abbreviation | Definition |
|---|---|
| TSB | Telecommunications System Bulletin |
| TSC | Test System Controller |
| TSD | Transmission System Development |
| TSDM | Telecom Services Data Model |
| TSDU | Transport Service Data Unit |
| TSES | Tele Support Expert Service |
| TSG | Technical Support Group |
| TSG | Telecommunications Security Group |
| TSG | Telephone Security Group |
| TSGR | Transport System Generic Requirements |
| TSI | Telecommunication System Integration |
| TSI | Telecommunications Services Inc |
| TSI | Time Slot Interchange |
| TSIP | Telecom Serial Interface Port |
| TSIP | Telecommunications System Installation Plan |
| TSM | Telecommunications Systems Management |
| TSMA | Telecommunication Systems Managements Association |
| TSMA | Telecommunications Services Master Agreement |
| TSOC | Telecom Security Operation Center |
| TSOG | Telecom Solutions Of Georgia |