It is used to set baud rate, parity check, number of data bits, stop bit.

它是用来设置波特率，奇偶校验，数据位数，停止位。

An RBSP is either empty or has the form of a string of data bits containing syntax elements followed by an RBSP stop bit and followed by zero or more subsequent bits equal to 0.

要么为空，要么是包含语法元素的串式位流，后跟一个表示RBSP结束的停止位，紧接着一些为0的填充位。