In longitudinal redundancy checking and cyclic redundancy checking, a character that is transmitted by the sender after each message block and is compared with a block-check character computed by the receiver to determine if the transmission was successful.; 在纵向冗余检验和循环冗余检验中,由发送端在每信息块之后发送的一种字符,并与由 接收端计算出来的块检验字符进行比较,以确定发送是否成功。参阅parity。