In 1984, the Synchronous Optical Network was proposed to eliminate mutually exclusive of the light interface, and it was marked as a kind of brand-new transmission network technology system. 同步光网络(SONET)(SONET)的概念出现于1984年,它的提出主要用于消除不兼容的光接口,并逐步发展成为一种全新的传输网络技术体制。
Synchronous Digital Hierarchy ( SDH ) and Synchronous Optical Network ( SONET ) are now applied worldwide both in carrier backbone networks, by metropolitan service providers and in large scale WANs by end-user organizations. 同步数字体系(SDH)和同步光纤网络(SONET)在世界范围广泛应用于城域主干网,长途通信网和广域网。
Optical Access Network c network. The Research on Specification of Transmitting Relay Protective Signals by Synchronous Optical Network 光纤通道传输继电保护信息技术规范的研究
The result of researching indicates that synchronous optical network can be used to transmit relay protective singnals if it is designed properly. 研究结果表明,只要合理配置SDH网络结构,电力专用光同步网能够满足传输继电保护信号的要求。
SDH ( Synchronous Digital Hierarchy ) has some primary advantages such as synchronous multiplexing, standard optical interface and strong network management compared with PDH ( Plesiochronous Digital Hierarchy ). 同步数字体制(SDH)与传统的伪同步数字体制(PDH)相比,有三大核心优势,即同步复用、标准光接口和强大的网管能力。