scope:

The present document is the baseline for the provision of an Interaction Channel (IC also known as Feed Back Channel (FBC)) to Digital Audio Broadcasting (DAB) ETS 300 401 [6]. The document includes the network dependent parts of the IC, for the GSM, PSTN, ISDN and DECT systems. The network independent protocols for the IC are specified within a separate document Eureka Project 147 [36].

In the process of producing the present document the specifications for an Interaction Channel for Digital Video Broadcasting (DVB) has carefully been studied. The goal has been to as far as possible be compatible with the DVB solutions thereby creating a common concept of treating the combination broadcast-/telecommunication system. The solutions provided here for an IC through GSM/PSTN/ISDN/DECT are only a part of a wider set of alternatives possible in order to implement interactive services for DAB systems.