| Abbreviation | Definition |
|---|---|
| FIDDI | Fiber Distributed Data Interface |
| FIFO | First In, First Out |
| FIN | Fully Integrated Network |
| FINGEO | Financial Geography |
| FIP | Factory Instrument Protocol |
| FIP | FDDI Interface Processor |
| FISH | FIles transferred over SHell protocol |
| FIT | Flexible Image Transport |
| FIT | Form Interactive Technology |
| FIT | Frequency of Information Transfer |
| FITM | Fiber In The Metro |
| FIWI | Fiber-Wireless |
| FLAG | Fibre Optic Link Around the Globe |
| FLAN | Flying Local Area Network |
| FLM | Formatted Logical Messaging |
| FLSM | Fixed Length Subnet Mask |
| FLSS | Forward Link Sub-System |
| FLT | First Level Troubleshoot |
| FMN | Future Multimedia Networking |
| FMS | Fieldbus Messaging Specification |