| Abbreviation | Definition |
|---|---|
| SSP | Self Stabilizing Protocol |
| SSP | Server-to-Server Protocol |
| SSP | Synchronous Serial Port |
| SSR | Server-Side Rendering |
| SSR | Smart Service Router |
| SSS | Server Side Scrolling |
| SSTN | Specialist School Transition Network |
| SSTP | Secure Socket Tunneling Protocol |
| SSTP | Shield Shielded Twisted Pair |
| ST | Subject To |
| STA | Spanning Tree Algorithm |
| STDM | Statistical Time Division Multiplexing |
| STE | Serial To Ethernet |
| STEP | Simple Transaction Exchange Protocol |
| STI | Source Transport Inversion |
| STLP | Secure Transport Layer Protocol |
| STM | Segment Time Marked |
| STM | Synchronous Transmission Mode |
| STM | Synchronous Transport Module |
| STM-1 | 155.520 Mbits/ Second |