The present document applies to Road Transport and Traffic Telematics (RTTT) wireless systems:
- with or without antenna connectors;
- for digital data transmission;
- operating on radio frequencies in the 5,725 GHz to 5,875 GHz Industrial, Scientific and Medical (ISM) frequency band.
The applicability of the present document covers both the Road Side Units (RSUs) and the On-Board Units (OBUs) with transceivers and transponders. The present document complies with ECC/DEC/(02)01 [1] and CEPT/ERC/REC 70-03 [3]. It is a specific standard covering various RTTT applications. Additional standards or specifications may be required for equipment such as that intended for connection to the Public Switched Telephone Network (PSTN) or other systems.

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To standardise the Radio part i.e. layer 1 including the physical aspects of Medium Access Control (MAC) of the equipment transmitting and receiving the communication protocols for DRSC, as defined by CEN 278 for RTTT. This ETS, together with ETS 300 683, is intended to become a harmonised standard, the reference of which is intended to be cited in the Official Journal of the European Communities referencing the EMC Directive. Close cooperation with CEN 278 required.

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