This Interim Standard specifies a framework for interoperable electronic fee collection (EFC) based on dedicated short-range communication (DSRC). Specification of the technical details of the radio communication is simply done by reference to the applicable CEN Standards. In addition, data to be used in interoperable Australian EFC transactions are specified. Depending on the on-board equipment type, these data may be transferred by different EFC transaction sequences. Two transaction sequences are defined in this document, both supporting central account payment. More transaction sequences might be recognized in the future should the need arise (e.g. in order to support payment based on values carried inside the on-board equipment).The framework specified herein relies on the following philosophy:(a) All equipment used will support the same radio link functionality, without variants.(b) Roadside equipment has to support all recognized transaction sequences specified in Appendix A and B (in order to be able to perform transactions with every type of on-board equipment).(c) On-board equipment has to support only one of the recognized transaction sequences. The above rules apply to the domain of interoperability only. For local usage, operators or other DSRC system users are free to make use of other data and transaction sequences, as long as they comply with the DSRC Standards. The DSRC Standards already provide for the selection/switching mechanism required to negotiate the applications between roadside and on-board equipment.The framework thus allows both for full interoperability through tightly specified recognized EFC transactions and for flexibility for future expansions and local needs through the negotiation mechanism inherent in the DSRC Standards. Additional Transactions may be added in the future by introducing a Recognized Type C transaction. This Interim Standard defines the protocol stack for communication between roadside equipment and on-board equipment using DSRC to perform EFC.It specifies:(i) The complete DSRC communication stack (OSI Layers 1, 2, and 7).(ii) The supported EFC transaction types.(iii) The EFC transaction data including security elements.Tests and requirements regarding compliance of equipment with this specification, such as type approval procedures, lie outside the scope of this document.

First published as AS 4962(Int)-2001.