nt local exchange carrier intermachine processors IMT-2000 International Mobile Telecommunications-2000 intermachine trunk improved MTS Intelligent Networks interoffice facility integrated optical network Internet Protocol Internet Protocol Routing Service indefasible right to use integrated services digital networks International Organization for Standardization Internet service providers ITU-T International Telecommunication Union integrated voice and data interexchange carrier key service units local area network local access and transport area List of Acronyms local exchange carriers Local Multipart Distribution Service local number portability media access control MAE-East Metropolitan Area Ethernet East MAE-West Metropolitan Area Ethernet West Microwave Communications, Inc. originally Modified Final Judgment Metromedia Fiber Network Metropolitan Fiber Systems Motion Picture Experts Group multischedule private line metropolitan statistical area multiple system operators major trading area message toll service mobile telephone system mobile telephone serving offices network control protocol NFSnet National Science Foundation network National Research and Education Network non-traffic-sensitive optical carrier original equipment manufacturer Open Systems Interconnection OSIRM OSI Reference Model operational support systems The Great Telecom Meltdown Palo Alto Research Center (Xerox) Private Branch Exchange personal communications service personal data assistant primary interexchange carrier point of presence primary rate interface Post, Telephone, and Telegraph agencies Public Utilities Commission quality of service Remote Acess Server RBOCs Regional Bell Operating Companies radio common carrier rural service area Satellite Business Systems specialized common carrier synchronous digital hierarchy symmetric digital subscriber line standard metropolitan statistical area, later renamed MSA Systems Network Architecture SONET Synchronous Optical Network Southern Pacific Communications Company service profile identi