This standard specifies radio parameters, data link services and protocol data units, and application services and protocol data units which are necessary for the efficient use of the radio spectrum and for the purpose of DSRC based applications. This includes methods of measurements for verifying the limits stated in this standard. 
This standard applies to 5,8 GHz Short Range Devices (SRDs) for use in Road Transport Traffic and Telematics (RTTT): 
• with a Radio Frequency (RF) output connection and specified antenna or with an integral antenna; 
• for data transmission only; 
• operating on radio frequencies in the 5 725 MHz to 5 875 MHz Industrial, Scientific and Medical (ISM) band. 
The applicability of this standard covers both the Road Side Units (RSUs) and the On Board Units (OBUs) with transceivers and transponders.