同步: synchronization; synchronism ...数字: figure; digit; numeral; char ...分层: lamination; layering; strati ...结构: structure; composition; cons ...传输: transfer; transmission; conv ...体系: system; setup; hierarchy同步数字分层结构管理系统: sdh management system同步数字传输网: sdn synchronous ditital transmission network; synchronous digital transmission network同步数字传输网络: sdn synchonos digita tansmission netwok; sdn synchronous digital tra mi ion network; sdn synchronous digital transmission network; sdnsynchronousdigitaltransmissionnetwork同步数字分级结构: sdh synchronous digital hierarchy同步数字体系: synchronous digital hierarchy; synchronousdigitalhierarchysdh准同步数字体系: pdh plesiochronous digital hierarchy; plesiochronous digital hierarchy同步数字: sdh同步数字网: synchronous digital network同步数字层阶结构: synchronous digital hierarchy (sdh)半同步数字网: semi synchronous digital network同步数字处理: synchronous digital process同步数字复用: sdh同步数字系列: sdh synchonos digita hieachy; sdh synchronous digital hierarchy; sdhsynchronousdigitalhierarchy; synchronous digital hierarchy sdh同步数字系统: sdh synchronous digital hierarchy; synchronous digital system同步数字体系的比特率: synchronous digital hierarchy bit rates同步数字体系管理网: sdh management network; sdhmanagementnetworksmn同步数字体系管理子网: sdh management sub-network; sdhmanagementsub-networksms同步数字体系交叉连接: sdxc synchronous digital同步数字体系信号的基本复用结构: basic multiplexing structure for synchronous digital hierarchy signals