RECOMMENDATION ITU-R F.592-3* - Vocabulary of terms for the fixed service**
1 Terms relating to radio transmission
    1.1 Fixed wireless system (FWS)
    1.2 Radio-relay system
    1.3 High-density applications in the fixed service (HDFS)
    1.4 High altitude platform station (HAPS)
    1.5 Fixed wireless access (FWA)
    1.6 Trans-horizon radio-relay system
    1.7 Point-to-point communication
    1.8 Point-to-multipoint communication
    1.9 Terms related to channel arrangements
    1.10 Terms related to diversity
    1.11 Cross polarization interference canceller (XPIC) (circuit)
2 Terms relating to availability and error performance for digital paths and connections (See ITU-T Recommendations...
    2.1 Availability performance
    2.2 Error performance
3 Terms relating to data transmission on analogue radio-relay systems
    3.1 Data under voice (transmission) (symbol: DUV)
    3.2 Data above voice (transmission) (symbol: DAV)
4 Terms relating to digital modulation
    4.1 n-state quadrature amplitude modulation (symbol: n-QAM)
    4.2 Simple modulation
    4.3 Multi-level modulation
    4.4 Multi-state modulation
5 Acronyms and abbreviations