论文部分内容阅读
本文介绍用6800单板机完成50波特电传机与2400b/s信道终端机的接口。这种接口不仅利用内存的缓冲,使发端报文先慢速存贮后快速发送,收端报文先快速接收后慢速打印,从而使低速起止式电传机与较高速的信道终端机协调工作;而且,由于在发送时扣除了电传信号中不含信息量的起止位,使信道效率提高60％;而采用重发三次接收端多数判决的纠错方法,使误字率由5×10~(-4)下降到1.5×10~(-7)。
This article describes the 6800 single-board machine to complete the 50-baud fax machine and 2400b / s channel terminal interface. This interface not only makes use of the buffer of the memory, so that the originating packet is sent slowly after being stored slowly, and the terminating packet is quickly received after being received quickly, so that the low-speed start-stop teletype machine coordinates with the higher-speed channel terminal Work; Moreover, since the start and end bits excluding the amount of information in the teletype signal are deducted when transmitting, the channel efficiency is increased by 60%; and the error correction method using retransmission of three times majority decision of the receiver makes the error rate from 5 × 10 ~ (-4) dropped to 1.5 × 10 ~ (-7).