scope:

This Draft second edition 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 synchronization 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 synchronized multiconnection structure in the case of multimedia services, such as videoconferencing.

It provides the means to transmit end-to-end inband signalling according to the procedures described in ETS 300 143 [2].

NOTE 1: Terminals conforming to this ETS and ETS 300 143 [2] are compatible with terminals according to ITU-T Recommendations H.221 [9] and H.242.

This ETS is applicable to terminals or other equipment (e.g. Multipoint Control Units) supporting audiovisual applications.

NOTE 2: A separate Interim European Telecommunication Standard (I-ETS) is under preparation (DI/TE-04120, Parts 1 to 3) which specifies the method of testing required to identify conformance to this ETS.