ssive machine-type communication mmWave millimeter wave (radio frequency bands) mean path delay Multiprotocol Label Switching maximum receive time difference MRTIE maximum relative time interval error Michibiki Satellite-based Augmentation System Moscow Standard Time mobile service provider/mobile operator machine-type communications maximum time interval error metro transport network MTSAT multi-functional transport satellite maximum transmit time difference maximum transmission unit multiplexer NASPI North American Synchrophasor Initiative NavIC Navigation with Indian Constellation numerically-controlled oscillator network element NETCONF Network Configuration Network Function Virtualization ng-eNB next generation evolved node B Next Generation Mobile Networks Alliance next generation network network interface card National Institute of Standards and Technology (USA) National Marine Electronics Association network management system network-network interface National Physical Laboratory India New Radio nanosecond or 1 X 10 9 second non-standalone Network Time Protocol NTPv4 Network Time Protocol version 4 National Time Service Center (China) Nippon Telegraph and Telecom (Japan) O-RAN Open Radio Access Network Operations, Administration, and Maintenance OBSAI Open Base Station Architecture Initiative ordinary clock oven-controlled crystal oscillator OTN equipment clock orthogonal frequency-division multiplexing OFDMA orthogonal frequency-division multiple access offset from master optical supervisory channel OSNMA Open Service Navigation Message Authentication (Galileo) organization specific slow protocol OTDOA Observed Time Difference of Arrival optical transport network (optical transport technology) Organizationally Unique Identifier P2P TC peer-to-peer transparent clock peer-to-peer private automatic branch exchange peak-to-average power ratio project authorization request Portable Document Format plesiochronous digital hierarchy protocol data unit packet delay variation PEC-M packet-based equipment clock-mas