This ETS specifies the frame structure and the syntax for end-to-end inband signalling for audiovisual services and end-to-end data communication between equipment using single or multiple digital channels (B@ H0@ H11 or H12) up to 1 920 kbit/s when connected by the pan-European Integrated Services Digital Network (ISDN). Digital audiovisual services are provided by a transmission system in which the relevant signals are multiplexed onto a digital path. This frame structure allows the best use of the total transmission capacity for the various data flows as audio@ video@ user data@ telematic information and special applications. Additionally@ signals for the proper functioning of the system are included. This ETS allows the synchronisation of multiple 64 kbit/s or 384 kbit/s connections and the control of the multiplexing of audio@ video@ data and other signals within the synchronised multiconnection structure in the case of multimedia services@ such as videoconference. It provides the means to transmit end-to-end inband signalling according to the procedures described in ETS 300 143 [2]. This ETS is applicable to terminals or other equipment (e.g. Multipoint Conference Units) supporting audiovisual applications. A separate ETS is under preparation (DE/TE-04120) which specifies the method of testing required to identify conformance to this ETS.
PRETS 300 144-1993 history
1995PRETS 300 144-1995 Integrated Services Digital Network (ISDN); Audiovisual Services Frame Structure for a 64 kbit/s to 1 920 kbit/s Channel and Associated Syntax for Inband Signalling (Second Edition)
1991PRETS 300 144-1991 Integrated Services Digital Network (ISDN) and Other Digital Telecommunications Networks Audiovisual Teleservices Frame Structure for a 64 to 1920 Kbit/s Channel (T/N 32-04)