| Abbreviation | Definition |
|---|---|
| SVW | Sioux Valley Wireless |
| SWAN | Structured Wireless Aware Network |
| SWANSAT | Super-Wide Area Network SATellite |
| SWAP | Shared Wireless Access Protocol |
| SWAT | Sit, Wait, And Talk |
| SWF | SWitched Fractional |
| SWF-DS1 | SWitched Fractional Digital Signal 1 line |
| SWIFT | Society for World Interbank Financial Telecommunication |
| SWIFT | Society of Worldwide Interbank Financial Telecommunication |
| SWIFT | Society Of Worldwide Interbank Financial Telecommunications |
| SWN | Statewide Wireless Network |
| SWNI | Smart Wireless Network Interface |
| SYN | Synchronization Character |
| SYNC | SYNChronous |
| SYNTRAN | SYNchronous TRANsmission |
| T | Telecom |
| T | Tip |
| T/C | Telephone Call |
| T1 | 1,544 Mbits per Second line |
| T3 | 44.736 Mbits per Second line |