Amendment 2:2020 to CSA ISO/IEC/IEEE 8802-11:19, Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 11: Wireless LAN medium access control (MAC) and physical layer (PHY) specifications - Amendment 2: Sub 1 GHz license exempt operation (Adopted amendment 2:2019 to ISO/IEC/IEEE 8802-11:2018)