A.直接接入監(jiān)控系統(tǒng)站控層網(wǎng)絡(luò) B.不接入監(jiān)控系統(tǒng) C.接入監(jiān)控系統(tǒng),但須進(jìn)行網(wǎng)絡(luò)間的邏輯隔離
A.≥85% B.≥90% C.≥95% D.≥99%
A.<=5s B.<=3s C.<=10s
A.0110 0111 0101 B.0110 0111 0100 C.0100 0101 0100 D.0110 0101 0101
A.1PPS脈沖信號:(TTL電平),上升沿的時間準(zhǔn)確度≤1μs B.1PPM脈沖信號:(TTL電平),上升沿的時間準(zhǔn)確度≤1μs C.1PPM脈沖信號:(空接點),上升沿的時間準(zhǔn)確度≤3μs D.1PPM脈沖信號:(空接點),上升沿的時間準(zhǔn)確度≤5μs