SDH possesses the unified network node interface (NNI) and standardized information class structure in the world. SDH can be compatible with PDH. It makes all the transmission network systems can communicate with each other on the level of STM-N.
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- SDH具有全球統一的網(wǎng)絡(luò )節點(diǎn)接口,標準化的信息等級結構,能夠兼容PDH準同步數字系列,使得全世界傳輸系統能夠在STM-N級別上實(shí)現互聯(lián)互通。
