ISO 4426:2021

This document specifies communication requirements in support of the Smart Digital Tachograph (SDT) as identified by Regulation 2016/799 of the European Union[23]. The specification covers: —    the physical layer at 5,8 GHz for SDT communications (SDTC); —    the data link layer (DLL) of SDTC; —    the application layer of SDTC; —    SDTC profiles which provide coherent sets of communication tools for applications based on SDTC. This document provides further information beneficial for the design and development of SDTC equipment.