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本文将讨论三次群数字复接器的基本工作原理和简化工程设计,并给出系统参数、帧同步技术指标以及复接器塞入抖动的计算和测量结果。微同轴电缆、三次群微波接力以及光缆等传输手段的发展,为三次群速率的应用创造了条件,因此,基群到三次群的数字复接也就成为现实的课题。关于三次群复接,目前国际上形成的唯一建议就是CCITT建议G. 751,它是针对二次群组合成三次群的复接,按照这种方式,从基群到三次群的组合,需要经过两次复接。我们所研制的三次群复接设备,可把16路基群数字信号直接组合成三次群数字信号,因此设备量
This article will discuss the basic working principle and simplified engineering design of triplex digital multiplexer, and give the calculation and measurement results of the system parameters, frame synchronization specifications and multiplexer jitter insertion. The development of transmission methods such as micro-coaxial cable, third-group microwave relay, and optical cable has created the conditions for the application of the third-order group rate. Therefore, the digital multiplexing of the basic group to the third-order group has also become a real issue. Concerning the triple-group multiplexing, the only international proposal currently formed is CCITT Recommendation G. 751, which is directed to the multiplexing of cubic groups of quadratic groups. In this way, the combinations from the basic group to the third-order group need to go through Double multiplexing. We have developed a three-group multiplexing device that can be combined with 16-channel group of digital signals directly into a three-group digital signal, so the amount of equipment