ISO 14443 interoperability in transit
UL's view on interoperability in transit
The contactless interface of existing validation and sales terminals is one of the most used means for public transport authorities and operators to interact with their customers.
The majority of these contactless interfaces are implemented along the lines of the ISO 14443 international standard. As long as only one specific type of contactless cards is used, the interface is usually fast, reliable and convenient. However, UL has observed major interoperability issues as soon as another contactless card is introduced. Examples of the issues are devices not even able to detect the new card, a substantial decrease in the fault tolerance or an unacceptable increase in transaction time.