cess point digital subscriber loop, digital subscriber line digital service unit data terminal equipment data user part errored block EBCDIC extended binary coded decimal interchange code energy per bit per interference density ratio Eb/No energy per bit per noise spectral density ratio earth curvature; earth coverage envelope delay distortion erbium-doped fiber amplifier error-free second extremely high frequency-the frequency spectrum range 30-300 GHz Electronic Industries Association effective (equivalent) isotropically radiated power electromagnetic compatibility electromagnetic interference exchange number end of message end of text echo return loss effective radiated power end section, errored second ACRONYMS AND ABBREVIATIONS extended superframe electronic switching system European Telecommunications Standardization Institute frame alignment signal Federal Communications Commission (U.S.) frame check sequence frequency division duplex fiber distributed data interface frequency division multiplex frequency division multiple access forward error correction far-end crosstalk fill-in signal unit filter frequency modulation FPLMTS future public land mobile telecommunication system frames per second frame relay access device frequency shift keying free-space loss forward sequence number file transfer protocol Gaussian band-limited channel gigabits per second GBSVC general broadcast signaling virtual channel geostationary earth orbit generic flow control Gaussian FSK gigahertz (Hz X 10°) Gaussian minimum shift keying Greenwich mean time geographical positioning system "group system mobile" (from the French; the digital European cellular scheme), also called Global System for Mobile Communications general switched telecommunications network gain (antenna)-to-noise temperature ratio General Telephone & Electronics headend controller high-level data link control high-definition television header error control high frequency; also the radio-frequency band range 3-30 MHz hybrid fiber coax high-power amplifier high usa