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(1) PDH光端機(jī)與SDH光端機(jī)有什么不同?在數(shù)字傳輸系統(tǒng)中.有兩種數(shù)字傳輸系列.一種叫"準(zhǔn)同步數(shù)字系列"簡(jiǎn)稱PDH,另一種叫"同步數(shù)字系列"簡(jiǎn)稱SDH.PDH(準(zhǔn)同步數(shù)字系列)光端機(jī)是小容量光端機(jī).一般是成對(duì)應(yīng)用.叫點(diǎn)到點(diǎn)應(yīng)用.容量一般為4＊E1.8＊E1.16＊E1.SDH…
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