RECOMMENDATION ITU-R M.1453-1 - Transport information and control systems - dedicated short range ... ANNEX 1 - Technical and operational characteristics of DSRC operating in the 5.8 GHz frequency band 1 General 1.1 Introduction 1.2 Scope 2 Technical and operational characteristics 2.1 Active (transceiver) method 2.2 Backscatter (transponder) method