业务数据功能（SDF，Service Data Function）：包含由SCF实时访问的客 户数据和网络数据。
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... SDE Storage Distribution Element 存储分配单元 SDF Service Data Function 服务数据功能 SDF Space Disturbance Forecast 空间干扰预报 ...
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Service Data Function SDF 业务数据功能
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