ge (route[s]) hertz ACRONYMS AND ABBREVIATIONS initial address message International Business Machine (Inc.) Internet control message protocol intermediate data rate Institute of Electrical and Electronics Engineers intermediate frequency InGaAsP indium gallium arsenide phosphorus INTELSAT International Telecommunication Satellite (consortium) input/output (device) Internet protocol isotropic receive level interim standard international switching center integrated services digital networks intersymbol interference industrial, scientific, and medical (band) International Standards Organization ISDN user part International Telephone and Telegraph Co. International Telecommunication Union ITU-R ITU Radiocommunications Bureau ITU-T ITU Telecommunications Standardization Sector interexchange carrier kilobits per second kilofeet kilohertz kilometer(s) local area network LAP, LAPB, LAPD link access protocol; link access protocol, B-channel; link access protocol, D-channel local access and transport area line build-out lost calls cleared lost calls delayed lost calls held laser diode line-extender amplifier local exchange carrier light-emitting diode low earth orbit logical link control local multipoint distribution system log to the natural base low-noise amplifier line overhead loss of signal; line-of-sight loudness rating longitudinal redundancy check long route design ACRONYMS AND ABBREVIATIONS lower sideband large scale integration link status signal unit meter milliampere(s) medium access control metropolitan area network medium attachment unit megabits per second main distribution frame multifrequency modification of final judgment multilevel or M-ary FSK megahertz message identifier medium independent interface multilevel or M-ary PSK multilink procedure modified long route design Motion Picture Expert's Group mobile station mobile switching center millisecond message signal unit mean time between failures message transfer part mobile telephone switching office millivolt milliwatt MW, M/W microwave not applicable