digital loop carrier system meaning in English

数字环路载波系统

Then the author presents the structure and the working principle of digital loop carrier system , in other word , the application environment of quad el transceiver , and then the author highlights the role that quad el card plays in the whole system , consequently , the author introduces the systematical structure and features of arm embedded processor . concerning about the restrict requirement of time during data transmission , the author of this paper also introduces the fpga technology , which is used mainly for providing the system with accurate time
接着叙述了数字环路系统的结构和工作原理，即四路e1收发器的应用环境，着重介绍了四路e1板卡在整个系统中所扮演的角色和嵌入式处理器arm的体系结构和特点，鉴于数据传输中对时钟的要求比较严格，本文还介绍了fpga技术，应用它主要是为系统提供各个精确的时钟。