F/O Fiber Optic FACCH Fast Associated Control CHannel (GSM) FCAPS Fault Configuration Accounting Performance Security FCC Federal Communications Commission FCC Federal Communications Commission (USA) FCCH Frequency Correction CHannel (GSM) FCVC Flow Control Virtual Circuit FDD Frequency Division Duplexing FDDI Fiber Distributed Data Interface FDL Facility Data Link FDL Form Description Language FDM Frequency Division Multiplexing FDMA Frequency Division Multiple Access FE Functional Entity FEBE Far-End Block Error FEC Forward Error Correction FEP Front-End Processor FEXT Far End CROSS-Talk FFT Fast Fourier Transform FGCS Fifth Generation Computer System FH Frequency Hop FHSS Frequency Hopping Spread Spectrum FIGS Fraud Information Gathering System FITL Fiber In The Loop FLAG Fiber-optic Link Around the Globe FLL Form Layout Language FM Frequency Modulation FMS Flexible Manufacturing System FN Fiber Node FOC Fully Operational Capabilities FOIRL Fiber Optic Inter-Repeater Link FPLMTS Future Public Land Mobile Telephone System FQDN Fully Qualified Domain Name (DNS) FR Frame Relay FRA Fixed Radio Access FSK Frequency Shift Keying FSS Fixed Satellite Service FSU Fixed Subscriber Unit FT1 Fractional T1 FTAM File Transfer Access Mechanism FTP File Transfer Protocol (IP suite) FTP Foil Twisted Pair (= ScTP) FTTC Fiber To The Curb FTTH Fiber To The Home FWA Fixed Wireless Access FWM Four Wave Mixing FX Foreign Exchange FYI For Your Information (RFC)