From the beginning, the Calypso objective is to contribute to the emergence of a ticketing standard allowing interoperability. This objective is easy to understand since the Calypso community is composed of transport operators and authorities, which naturally are looking for standardization which means:
- Possibility to build interoperability at all levels (regional, national, international),
- Real competiveness between providers, synonym of decrease in costs,
- Sustainability of the important investments realized when implementing a ticketing system, and easy management of its evolution.
On the contrary, a non-standardized solution generally means a proprietary solution and leads to a strong dependence in the manufacturer-provider, and consequently to costly evolutions of the system.
In this philosophy, Calypso strictly respects all existing “de jure” standards:
- Contactless standard ISO 14443 A and B, 1 to 4.
- ISO 7816-3 and 4 for card commands and file structures.
- Recommends the use of the EN 1545 standard for structure of the data.
Calypso is also compliant with ITSO, for integration in this system scheme.
Scheme of the 7 layers of a ticketing transaction:
Calypso provides the heart of a fully secure contactless ticketing transaction, at the third level of the ISO transaction scheme (model): the implementation of the exchanges of data between the card and the reader, encapsulated in the Session and Ratification mechanisms, respects all existing standards at the lower levels (1 & 2), and allows for the use of the existing ones at the upper levels (such as EN 1545 for data structure).