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1·Synchronous DXC will form the cornerstone of the new synchronous digital hierarchy.

同步数字交叉连接单元将成为新的同步数字系列的基石。

2·This Recommendation provides an information model for the Payload Configuration Management of Synchronous Digital Hierarchy (SDH) Networks.

本建议给出了同步数字系列(SDH)网络的净负荷配置管理的信息模型。

3·In multiplex and demultiplex systems such as Synchronous Digital Hierarchy (SDH), timing processing is very important to system performance.

在复分接系统中，如同步数字系列(SDH)，定时处理占有重要地位。

4·This Recommendation lists abbreviations and describes terms used in ITU-T Recommendations on synchronous digital hierarchy (SDH) networks and equipment.

本建议列出各种缩写，并说明itu - T在同步数字体系(SDH)网络和设备建议中使用的术语。

5·The system may be widely used in time synchronization in Synchronous Digital Hierarchy (SDH) communication network and exchange and other timing application cases.

该系统可应用于SDH通信网时间同步、交换机时间同步等高精度定时领域。

6·Generic framing procedure(GFP) is a new brand of data-packet transmitting protocol on synchronous digital hierarchy(SDH), as well as on optical transport network(OTN).

通用成帧协议（GFP）不仅是光同步数字传输网上的传输协议，而且是光传输网上的新型数据包传输协议，它具有简单、多协议适配等优点。