Abstract: The special feature of SDH and its dominant position in long distance communication of factories and mines were described,and an engineering design was llustrated.

 
  • 文摘:論述了SDH同步數字傳輸系統的特點(diǎn)及在廠(chǎng)礦企業(yè)遠距離通信中的優(yōu)勢,并結合實(shí)例介紹了其工程設計方式。
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