ATM + MPEG2 = high-efficiency multimedia

Source: Internet
Author: User

The demand for enhanced media services, such as Internet access, on-demand video streaming, digital TV, and IP voice, is growing daily. Therefore, the demand for high-performance distribution technology is also growing. To meet this demand, service providers adopt ATM technology to provide flexible and scalable channels for high-speed voice, video, and data access over the network. The advanced bandwidth utilization function of ATM enables service providers to efficiently transmit large and complex video packets without increasing the burden on the network.
However, ATM alone cannot efficiently support these services. Combined with MPEG-2 compression technology, providers can efficiently transfer enhanced media over an ATM while ensuring integrity and quality of service QoS. ATM works with MPEG-2 for local exchange companies and last mile service providers including cable TV CATV) companies, communication companies, fiber optic access companies and wireless companies) provides the technologies they need to disseminate high-quality and enhanced media services.
Most of the transmission streams transmitted on the ATM infrastructure are voice and data, and video transmission will soon become an important position and will promote the demand for more high-capacity ATM networks. ATM technology is based on high-efficiency, low-capacity exchange and multiplexing mechanisms, which are very suitable for environments with special bandwidth restrictions.
ATM allocates bandwidth as needed by establishing a virtual channel and a virtual path between the source and destination of the ATM network. These channels are not dedicated physical connections, but permanent virtual connections that can be removed or exchanged when they are not needed. The speed and reliability of the ATM switching network are incomparable to those of other popular WAN technologies, but even in the ATM environment, the nuances and special characteristics of data videos also make it impossible to transmit real-time videos in original non-compressed formats on the ATM.
In order to effectively transmit videos in an ATM environment without compromising the quality, the mobile image Expert Group MPEG developed a series of hardware and software standards to reduce the storage capacity of digital videos. Among them, MPEG-2 is a high-efficiency compression solution for publishing high-quality, full motion video data. With MPEG-2's advanced compression technology, providers can eliminate technical barriers while managing and ensuring the integrity of large, high-speed video streams transmitted over ATM.
Full-motion and digital non-compressed videos require a data transmission rate of about Mbps. The MPEG-2 can reduce the video transmission rate requirement for the publishing quality used in editing and processing to 16 Mbps with almost no loss of quality, the transmission rate of the published video received by the end user is reduced to 4 Mbps. Providers can use algorithm compression technologies such as secondary color sampling to ensure video quality. Secondary color sampling compresses the color changes invisible to the human eye. Motion Vector estimation randomly samples image frames to evaluate the video quality at a given time point, so that providers can ensure QoS in an ATM environment. Put the MPEG-2 on the ATM network for transmission, and then select it in the correct order to ensure quality, edge devices of the ATM network must be well suited for processing MPEG switching and jitter management to compensate for network latency.
Local MPEG-2 video streams are generally transmitted through the so-called digital video broadcast asynchronous serial interface. ATM edge device to MPEG-2 multi-program transmission flow MPTS) or single program transmission flow in the program layer analysis and finally in the package identification level PID) on the split analysis. At the PID level, program streams can be reordered and combined into another MPTS. This process is called reuse. Each MPEG-2 packet is then tagged with a PID, which is a 13-bit domain that identifies the program, the transfer stream, and the relationship between packets. This structure may become the main implementation method for enhancing media services.

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