| Abbreviation | Definition |
|---|---|
| FPS | Fast Packet Switching |
| FPS | Framing Pattern Sequence |
| FR | Fractional |
| FR | Functional Requirement |
| FRAD | Frame Relay Access Device |
| FRAD | Frame Relay Assembler/Disassembler |
| FRF-LMI | Frame Relay Forum - Local Management Interface |
| FRPVC | Frame Relay Permanent Virtual Connection |
| FRS | Frame Relay Service |
| FRSS | Frame Relay Switching System |
| FR-SSCS | Frame Relay Service Specific Convergence Sub-layer |
| FSAI | Fiber Serving Area Interface |
| FSC | Full Spectrum Communications |
| FSFB | Flexi System Fibre B |
| FSI | Foreign System Interface |
| FSK | Frequency Shift Keying |
| FSM | Field Service Manager |
| FSM | Forward Short Message |
| FSS | Fixed Satellite Services |
| FT | Face Time |