说明：  5B6B码是光纤数字通信系统中使用比较广泛的一种线路码型! 数据经过5B6B编码和并串转换后在光纤上传输，串行码序列中连续的比特0或比特1的长度不超过5，数据在0和1之间变换的密度很高,并具有直流平衡的特性，有利于接收电路和时钟恢复电路的设计。
(5B6B code is used in fiber optic digital communication systems a more extensive line pattern! Data are 5B6B encoding and conversion, and string after the fiber transmission, serial code sequences in continuous bit 0 or bit 1 of the length of not more than 5, data between 0 and 1, the high density of transformation, and has the characteristics of DC balance, favorable reception circuit and clock recovery circuit.)