Chapter 2 describes the system part of MPEG-2 standard with focuses on PSI (Program Specific Information) and PCR (Program Clock Reference).

第二章主要讲述了MPEG - 2标准系统层规范，着重介绍节目特殊信息PSI和节目时钟参考pcr。

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The service information (SI) is the data used to describe transport system, transport content and data stream time table, and also is the additional data used to complement MPEG-2 PSI.

业务信息（ SI ）是用来描述传送系统、传送内容和广播数据流时间表等的数据，是补充MPEG 2节目说明信息（ PSI）的附加数据。

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