100BASE-TX采用的编码技术为（ ），采用（ ）个电平来表示二进制0和1。
问题1选项
A.4B/5B
B.8B/6T
C.8B/10B
D.MLT-3
问题2选项
A.2
B.3
C.4
D.5
正确答案及解析
正确答案
解析
答案： D、B
MLT-3即Multi-Level Transmit -3，多电平传输码，MLT-3码跟NRZI码有点类型，其特点都是逢“1”跳变，逢“0”保持不变，并且编码后不改变信号速率。如NRZI码不同的是，MLT-3是双极性码，有”-1”、“0”、“1”三种电平，编码后直流成份大大减少，可以进行电路传输，100Base-TX采用此码型。
此题目应该两空统一来看，选择D、B最为合适。当然第一空选A也不能算错。
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