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Overcoming the challenges to successful deployment of digital video

机译：克服成功部署数字视频的挑战

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Abstract: The received quality of MPEG-2 video depends crucially on the performance of the underlying transport technology. Loss or delays in the delivery of MPEG-2 packets can result in defects such as jagged movements or screen freezes when the video is played back. Partly because of its high bandwidth and its ability to provide QoS guarantees, ATM is widely seen as an ideal transport technology for MPEG-2 video. ATM in itself, however, is not a complete solution to the successful deployment of MPEG-2 video. The ATM connections must be configured correctly, and the MPEG-2 source must be well behaved, otherwise poor performance can still result. Traffic policing is a key mechanism used by ATM to achieve its QoS guarantees. Policing will discard traffic from sources that do not stay within the bounds of the bandwidth agreed upon when the ATM connection was set up. If the MPEG- 2 source itself is badly behaved and MPEG-2 packets are lost due to policing, then the received video quality may be poor. This paper uses commercially available equipment to assess the impact on video quality of loss due to policing in an ATM network. !13
机译：摘要：MPEG-2视频的接收质量主要取决于基础传输技术的性能。 MPEG-2数据包的丢失或延迟可能会导致诸如视频播放时的锯齿运动或屏幕冻结之类的缺陷。部分由于其高带宽和提供QoS保证的能力，ATM被广泛认为是MPEG-2视频的理想传输技术。但是，ATM本身并不是成功部署MPEG-2视频的完整解决方案。必须正确配置ATM连接，并且MPEG-2源必须表现良好，否则仍可能导致性能不佳。流量监管是ATM​​用于实现QoS保证的关键机制。警务将丢弃来自未在建立ATM连接时同​​意的带宽范围内的源的流量。如果MPEG-2源本身表现不佳，并且由于管制而丢失了MPEG-2数据包，则接收到的视频质量可能会很差。本文使用可商购的设备评估由于ATM网络中的管制对视频丢失质量的影响。 ！13

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