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PDH和SDH:通信世界的接力与超越
在我们享受着高速、稳定的通信网络时,你是否想过光传输技术是如何一步步发展到今天的呢? 文档君就带大家来认识一下通信技术的祖师爷PDH、以及青出于蓝胜于蓝的SDH吧~ PDH,即准同步数字体系。在早期的通信网络中,它发挥了关键作用。 PDH准同步数字体系 ...
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