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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. DFS disciplined frequency standard DNHR dynamic nonhierarchical routing DoD U.S. Department of Defense DoT U.S. Department of Transportation DSP digital signal processing DTD digital time division DTMF dual-tone multifrequency signaling ECSA Exchange Carrier Standards Association EO Executive Order FAA Federal Aviation Administration FCC Federal Communications Commission FDDI fiber digital distribution interface 5ESS No. 5 Electronic Switching System 4ESS No. 4 Electronic Switching System GOES Geosynchronous Orbiting Environmental Satellite GPS Global Positioning System HDTV high-definition television IDTV improved definition television IEC interexchange carrier INTELSAT International Telecommunications Satellite Organization ISDN integrated services digital network LAN local area network LATA local access transport area LEC local exchange carrier LED light-emitting diode LMSS land mobile satellite systems LORAN-C Long-Range Navigation System-C MAN metropolitan area network MCI MCI Communications Corporation MF multifrequency signaling ms milliseconds µs microseconds MTBF mean time between failure MTSO mobile telephone switching office MTT mobile transportable telecommunications MTTR maximum time to repair NASA National Aeronautics and Space Administration NBS National Bureau of Standards NCC National Coordination Center NCS National Communications System
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