摘要
E1网络可靠性高,应用广泛,卫星调制解调器中,E1接口的设计具有重要的意义,并可扩展到其他应用场合。E1接口芯片采用的是DS21354,该芯片主要实现数据编解码、数据/时钟恢复,波形成型以及帧定位功能,芯片配置由单片机完成。为了解决远端站与中心局之间的传输需求,提供了提取和插入功能,该操作用FPGA实现,通过单片机可选择性地调节提取和插入的时隙,使用了乒乓操作和FIFO来完成该功能。
Owing to its high reliability,E1 network is widely used. So the design of an E1 interface for a satellite modem is of great significance,and the interface chip based on DS21354 mainly implements encoding/decoding,data/clock recovering,wave shaping and frame locating. The chip is configured by a singlechip. In order to meet the transmission request between the remote station and the central office,the ＂drop ＆amp; insert＂ function is provided,which is accomplished by FPGA,and the time slots are selectable from the 51 singlechip.Ping-pong operation and FIFOs are used in the design.
出处
《通信技术》
2009年第12期29-31,共3页
Communications Technology
基金
国家高技术发展计划(863计划)课题"高效信道编码与广义空时码的联合优化设计研究"(编号:2006AA01Z269)
