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Proceedings Paper

MPEG over ATM issues: a scenario overview
Author(s): F. Bernabei; M. Moscatelli; Giuseppe Russo; Paolo Talone
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Paper Abstract

Specific mechanisms are required to carry MPEG coded information over an ATM network. After a brief description of the MPEG-2 video coding algorithm, this paper discusses the `isochronism' related requirements for the transmission of the coded data and the problems associated with the use of an anisochronous transmission mechanism. The main problems, concerning the choice of the ATM adaptation layer (AAL) for each level of interaction, are discussed. Even if the MPEG stream is inherently bursty, the technical literature considers both the constant bit rate (CBR) and variable bit rate (VBR) solutions. The paper reports on a study concerning the AAL choice, in relation with the degree of interactivity required by the application and with the delay constraints. A further issue is an overview of different scenarios for the provision of video services, by `MPEG or ATM.' Different possible network and service architectures are analyzed, and various solutions for storing video information are proposed. Three different service architectures are discussed: the fully centralized, the quasi- centralized, and the fully distributed. The last issue dealt with in the paper concerns a very attractive class of interactive video services, video-on-demand (VoD). In particular, the impact of the digital storage media-control command (DSM-CC) in the provision of a particular VoD service, the `video rental' service, is described. The network requirements to support DSM- CC commands allowing the user to perform the typical video cassette recorder (VCR) functions (freeze frame, fast forward, fast reverse) are stressed. Alternative approaches for the implementation of each command are discussed together with their impact on the traffic network.

Paper Details

Date Published: 17 February 1995
PDF: 13 pages
Proc. SPIE 2451, Advanced Image and Video Communications and Storage Technologies, (17 February 1995); doi: 10.1117/12.201209
Show Author Affiliations
F. Bernabei, Fondazione Ugo Bordoni (Italy)
M. Moscatelli, Fondazione Ugo Bordoni (Italy)
Giuseppe Russo, Fondazione Ugo Bordoni (Italy)
Paolo Talone, Fondazione Ugo Bordoni (Italy)


Published in SPIE Proceedings Vol. 2451:
Advanced Image and Video Communications and Storage Technologies
Naohisa Ohta; Heinz U. Lemke; Jean Claude Lehureau, Editor(s)

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