“plesiochronous digital hierarchy，PDH”的概念、定义、翻译、参考文献-科学参考

单词	plesiochronous digital hierarchy，PDH
释义	plesiochronous digital hierarchy，PDH Encyclopedia 工学【复用概念】释 plesiochronous digital hierarchy，PDH准同步数字体系基于同频（比如时钟不同源，允许小范围差异）的异步复用技术的数字复用体系。
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