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Chapter 3The DVB/DAVIC protocol pInitially DVB recommendations did not cater for bi-directional communications.However, the implementation of interactive TV will require data in the reversedirection. Therefore, the DVB group is turning to other standardising bodies in order toproduce a specification with a wider range of applications, which will span beyonddigital TV broadcast such as high-speed Internet access, VoIP, video-telephony andvideoconferencing, among other services.At the initial stages DVB was evaluating which standard would be the most suitable forthe delivery of Motion Picture Experts Group (MPEG-2) audio/video streams overCATV networks. At its meeting in July 1997, DVB announced it would adopt theDAVIC 1.2 specification. Thereafter, both the UK and the European CableCommunication Associations (ECCA) announced that they were going to support theDVB/DAVIC standard.In order to accomplish compatibility with the other standards under development, DVBrequested from the IEEE 802.14 group to optionally include “DAVIC 1.2 Part 8” in it’sspecification, which dealt with lower layer protocols and physical interfaces for coaxialcable (including the MAC functionality). The European Telecommunication StandardETS 300 800 [32] (also known as DVB/DAVIC) has now been produced as the baselinespecification of the interaction channel for CATV distribution systems. Shortlythereafter, the European Telecommunication Standards Institute ETSI officiallyaccepted this standard, which became the European Standard “ETSI ES 200 800” [34],in April 2000.3.3 EuroModemMeanwhile the process of standardisation of the ETSI ES 200 800 protocolspecification, the European Cable Communication Association (ECCA) [131] andEuroCableLabs (ECL), as the centre of competence of the European cable operators,decided in January 1999 to push and co-ordinate the activities for the marketintroduction of the DVB/DAVIC compliant cable modems (based on the standards ETS300 800 and ETSI ES 200 800). Thus, the EuroModem project emerged and created thetechnical specification of an external cable modem that fulfils the requirements of the3-2