A symbol which deliberately violates Manchester encoding rules, used as part of the collision presence signal. A CVL is encoded as a transition from HI to LO at the beginning of the bit-cell, LO for the entire bit-cell, and a transition from LO to HI at the end of the bit-cell.; 有意違反曼徹斯特編碼規(guī)則的一種符號,用作沖突存在信號的一部分。在該比特碼元開始時,CVH編碼為從HI到 LO的轉(zhuǎn)移,整個比特碼元為LO,在該比特碼元結(jié)束時編碼為從LO到HI的轉(zhuǎn)移。