A.100mB.200mC.300mD.500m
A.應(yīng)急通信網(wǎng)絡(luò)B.IPC.VLAND.傳輸網(wǎng)絡(luò)
A.電路接觸不良B.電路接觸不良,光路衰減過大C.設(shè)備系統(tǒng)與攝像頭不匹配D.視頻數(shù)據(jù)線端子接觸不良