小遠方返回物[式:在最小遠方返回模式下,允許多路復(fù)用器從外部接口返回數(shù)據(jù),不進行任何有助于診斷G.703線路側(cè)問題的處理,不計時鐘速率。數(shù)據(jù)由G.703輸入進入,經(jīng)過數(shù)據(jù)穩(wěn)定閉鎖(同時恢復(fù)正確的信號極性),以及多路復(fù)用器,然后回到發(fā)送器。出現(xiàn)數(shù)據(jù)丟棄點之后,差分接收數(shù)據(jù)模塊運行并傳遞給G.703發(fā)送器模塊。G.703接收器模塊功能完備,不斷處理數(shù)據(jù)并將數(shù)據(jù)傳送到差分曼徹斯特碼發(fā)送器模塊。由于計時信號的接收與返回同時進行,因此認為計時源來自接口的G.703線路側(cè)。
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