The invention relates to a connection interface comprising a circuit arrangement, for associating incoming data messages with available information, comprising a means for comparing incoming messages with available information and for storing available information. To this end, the means comprises a plurality of comparison elements with which a respective memory is associated, said respective memories together forming a storage element for storing information relating to non-associated messages, and the comparison elements are designed to compare, in parallel, incoming messages with the information stored in the respective memories thereof.