BS ISO 4426:2021

This standard BS ISO 4426:2021 Intelligent transport systems. Lower layer protocols for usage in the European digital tachograph is classified in these ICS categories:

• 35.240.60 IT applications in transport and trade
• 03.220.20 Road transport

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.