| A | B |
|---|
| SMF | Single Mode Fiber |
| SMS | Storage Management Services |
| SMTP | Simple Mail Transfer Protocol |
| SNMP | Simple Network Management Protocol |
| SOA | Start of Authority |
| SOHO | Small Office / Home Office |
| SONET | Synchronous Optical Network |
| SPS | Standby Power Supply |
| SPX | Sequence Packet Exchange |
| SSH | Secure Shell |
| SSID | Service Set Identifier |
| SSL | Secure Sockets Layer |
| ST | Straight Tip |
| STP | Shielded Twisted Pair |
| T1 | T-Carrier Level 1 |
| TA | Terminal Adaptor |
| TCL | Terminal Control Language |
| TCP | Transmission Control Protocol |
| TCP / IP | Transmission Control Protocol / Internet Protocol |
| TCSH | Turbo C Shell |
