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一、DMIF制定的目的MPEG－2 TS流在专用网上数字电视信号的传输方面已获得巨大成功，但是MPEG－2传输流的设计和优化还是对于某一具体传输媒质而言的，这使得MPEG－2 TS在同一层中还包括了数据链路层的特性（如同步字节和固定的分组长度），以及同步特性（如参考时钟和时间戳）
First, the purpose of the DMIF MPEG-2 TS stream in the private network digital television signal transmission has been a great success, but MPEG-2 transport stream design and optimization is still for a specific transmission medium, which makes the MPEG- 2 TS also includes data link layer features (such as synchronization bytes and fixed packet length) in the same layer, as well as synchronization features (such as reference clock and timestamp)