NTP层级（Stratum）
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<timefyi-glossary slug="ntp-stratum"></timefyi-glossary>定义
NTP时间分发系统的层级。第0层设备为参考时钟（GPS、原子钟）；第1层服务器直接连接第0层；每增加一层，延迟增加，精度降低。