A.110kV及以上電壓等級 B.220kV及以上電壓等級 C.330kV及以上電壓等級 D.500kV及以上電壓等級
A.M1 B.G1 C.P1 D.S1
A.幀(frame),數(shù)據(jù)包(packet),段(segment),比特流(bit) B.段(segment),數(shù)據(jù)包(packet),幀(frame),比特流(bit) C.比特流(bit),幀(frame),數(shù)據(jù)包(packet),段(segment) D.數(shù)據(jù)包(packet),段(segment),幀(frame),比特流(bit)