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