A.光纜中斷 B.收光低 C.電路配置錯誤 D.上下游設(shè)備掉電
A.CONTEXT_PACKET_LOS B.E1_LOS C.E1_AIS D.PPI_LOS
A.交叉盤壞 B.交叉數(shù)據(jù)錯誤 C.光纜斷 D.線路盤壞