ternet protocol television IPv4, IPv6 Internet protocol version 4, Internet protocol version 6 Inter-Range Instrumentation Group Interim Standard Integrated Services Digital Network industry specification group inter-symbol interference International Organization for Standardization Internet Society information technology International Timing & Synchronization Forum ITU-D ITU Telecommunication Development Sector ITU-R ITU Radiocommunication Sector ITU-T ITU Telecommunication Standardization Sector International Telecommunication Union interworking function joint processing joint transmission kilobits per second key performance indicator L1, L2, L5 bands of radio spectrum between 1~2 GHz layer 2 (of the OSI model) layer 3 (of the OSI model) L2P2P layer 2 peer-to-peer L3E2E layer 3 end-to-end Licensed Assisted Access Link Aggregation Control Protocol Link Aggregation Group local-area network low frequency Link Layer Discovery Protocol LORAN Long Range Navigation low-pass filter LTE Positioning Protocol low smoke and fume LTE-A Pro Long Term Evolution-Advanced Pro (mobile communications standard) LTE-A Long Term Evolution-Advanced (mobile communications standard) Long Term Evolution (mobile communications standard) machine-to-machine media access control (address) MACsec media access control security metropolitan-area network maser microwave amplification by stimulated emission of radiation maximum absolute time error with low-pass filter maximum absolute relative time error max TE maximum absolute time error mBMCA modified best master clock algorithm Multimedia Broadcast Multicast Service MBSFN MBMS Single Frequency Network micro coaxial connector modified Allan deviation MEF Forum (formerly Metro Ethernet Forum) master eNodeB medium earth orbit mid-haul (network) Management Information Base MiFID-II Markets in Financial Instruments Directive (2014/65/EU) Master International Frequency Register Multipurpose Internet Mail Extensions multiple input multiple output machine learning micro-miniature coaxial connector ma