通過SONET/SDH和/或多路復(fù)用器系統(tǒng)，RS422接口可用于單通道或雙通道情況。當(dāng)用于單通道情況時(shí)，RS422接口采用Tx、Rx、和發(fā)送定時(shí)的典型方式與更高階系統(tǒng)連接。然而，當(dāng)作為雙通道應(yīng)用時(shí),由于兩個(gè)RS422通道采用一個(gè)時(shí)鐘輸入

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