in Spain. In that time Ansaldo adopted the balise type for the digital evolution of the Italian SCMT also becoming a second supplier for the balise type to other railways. These balise types were later collectively named KER balises from their usage in KVB, Ebicab and RSDD (Ripetizione Segnali Discontinua Digitale). Another source for the technology comes from the Siemens ZUB 100 family where they used coupling coils at the side of the tracks to augment the existing train protection system with additional signalling. The first ZUB 111 beacon did just allow for 21 states (using 2 out of 7 frequencies). The successor ZUB 122 switched to a digital telegram modulated on an 850 kHz carrier. The latter was used first in the for Switzerland since 1992 and for Denmark since 1992. The telegram types of these systems are compatible with the ORE A46 specification for the German LZB telegrams (about 83 bits). Siemens published a report showing the advantages of the balise technology for railway operations in 1992 and in the fall of 1995 they delivered prototypes of Siemens type S21 Eurobalise. ABB, Alsthom and Ansaldo did also cooperate in the development and the S21 balise along with other Eurobalise prototypes were tested from July to October 1996 at the Velim railway test circuit and the Austrian railways test lab (Forschungs- und Prüfzentrum Arsenal). The Eurobalise FFFIS (Form Fit Function Interface Specification) was introduced to the ERMTS range of specifications as SUBSET-036. Its foreword describes the specification to be based on the results of EUROSIG consortium (ACEC Transport, Adtranz Signal, Alcatel SEL, GE C Alsthom Transport, Ansaldo Trasporti, CSEE Transport, SASIB Railway, Siemens, and Westinghouse Signal) that got financial support from the European Commission. The EUROSIG formed after the initial Eurobalise/Euroloop Project 92/94 leading into the actual ERTMS/EUROSIG Project 95/98 supported by the parallel EMSET Project 96/00 (testing the Eurocab specification). When the EUROSIG project had ended the ETCS was still not ready for real world application. So 1998 saw the formation of UNISIG (Union of Signalling Industry), including Alstom, Ansaldo, Siemens, Bombardier, Invensys and Thales which were to take over the finalisation of the standard. The first baseline specification has been tested by six railways since 1999 as part of the European Rail Traffic Management System The railway companies defined some extended requirements that were added to ETCS including telegram packet types for RBC-Handover and track profile information