快速调谐，机载DME通过交替调谐两部地面DME电台以测得来自同一台询问机的两个距离数据的能力。

AGILITY TUNING, the capability of the DME to alternately tune between two different DME stations in order to get two distance readings from one interrogator.

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这些数据帮助综合接收解码器（ IRD）自动调谐，给用户提供附加信息，使IRD能自动设置可供选择的业务。

These data help IRD tune automatically, provide users with an additional information, making IRD automatically set up the optional services. SI provides all data that EPG needs.

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数据广播的一个首要问题是如何调度待广播的数据，优化数据广播的访问时间和调谐时间。

An important of data broadcast is how to schedule the broadcast data in order to optimize the access time and tuning time of the broadcast.

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