A.K1 B.K2 C.K3 D.K4
A.由于網(wǎng)管上門限設(shè)置不當(dāng),造成誤告警 B.連接尾纖彎折曲率過大 C.與該OTU對(duì)接的SDH設(shè)備停電 D.波分側(cè)線路光功率下降