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SDH, SONET and PDH - 高雄應用科技大學
wshnt.kuas.edu.tw487 SDH, SONET AND PDH 14 SECTION III TROUBLESHOOTING WIDE-AREA NETWORKS past few years. All PDH multiplex hierarchies can also be transmitted over the SDH/SONET network, so that the transition from PDH to SDH/SONET is smooth.