BS EN ISO 14819-2:2021

What is ISO 14819‑2 about?  

 ISO 14819‑2 is the second part of the ISO 14819 series of standards, covering the ‘ALERT-C’ protocol which describes how traffic messages are coded for transmission as an ‘Open Data Application’ over the Radio Data System (RDS), a sub-carrier on FM radio transmissions. 

ISO 14819‑2 describes the ALERT-C protocol concept and message structure used to achieve densely coded messages to be carried in the RDS-TMC feature.  

ISO 14819‑2 specifies the ‘Events List’ to be used in coding those messages. 

NOTE- 

A complete understanding of RDSTMC is only possible by reading this document (Part 2) together with the other parts of the ISO 14819 series of standards, which are: 

• ISO 14819-1, which describes the ALERT-C protocol concept and relationship with the RDS standards, IEC 62106 (all parts); 
• ISO 14819-3, which describes ways in which position and places are coded using ALERT-C; and 
• ISO 14819-6, which describes how messages may be optionally encrypted for conditional access. 

Who is ISO 14819‑2 for? 

ISO 14819‑2 on event and information codes for Radio Data System - Traffic Message Channel (RDS-TMC) using ALERT-C is useful for: 

• Traffic management department  
• Vehicle Manufacturing company 
• RDS-TMC system developer 

Why should you use ISO 14819‑2?  

ISO 14819‑2 covers the ‘ALERT-C’ protocol. It helps you understand how traffic messages are coded for transmission as an ‘Open Data Application’ over the Radio Data System (RDS), a sub-carrier on FM radio transmissions.  

ISO 14819‑2 contains the special meta-language which technical experts agreed would be the sole source for all coded descriptions used in RDS-TMC. This methodology has allowed agreement over important details for the many hundreds of event phrases so included, even though subtle linguistic differences were perceived and allowed for in terms of end-user presentation. 

What’s changed since the last update?  

BS EN ISO 14819‑2:2021 supersedes BS EN ISO 14819‑2:2013. BS EN ISO 14819‑2:2021 includes some technical changes with respect to BS EN ISO 14819‑2:2013. These include: 

• In the Event List, the column “P” for ‘phased-out codes’ has been added 
• A small number of additional events have been added to the Event List 
• A small number of additional events have been added to the Supplementary List 
• Wording has been improved for greater clarity 
• Several minor typographical errors have been corrected