On the Delay and Quality of DV Transmission Systems Using ATM Networks

In these days, transmittingDV data which needs 28 Mbps traffic has been possible, because public ATM networks, like Japan Giga-bit Network(JGN)can be used. DV system is not only good quality of audio and video, but also has small processing delay. DV system is suitable for interactive systems like teleconferencing for the small delay. In this paper, we report the result of measurements of delay time of DV systems on JGN. DVTS over IP and SONY SEU-TL100 over ATM are measured. The delay time of the systems are 90 220 msec including NTSC / DV converter. The delay time of the ATM network is 11 msec for Tokyo-Osaka that varied for distance and routes. Jitters are also varied for congestion. The jitters make the quality of DV decrease rapidly when system buffers are small.