同步数字交叉连接单元将成为新的同步数字系列的基石。
Synchronous DXC will form the cornerstone of the new synchronous digital hierarchy.
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。
In multiplex and demultiplex systems such as Synchronous Digital Hierarchy (SDH), timing processing is very important to system performance.
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。
This Recommendation provides an information model for the Payload Configuration Management of Synchronous Digital Hierarchy (SDH) Networks.
本文介绍了光同步数字系列的基本概念、特点及其与PDH 的比较，并简要介绍了目前商用SDH传送设备及其组网情况。
This paper introduces the basic concept and features of SDH as compared with PDH. The available SDH transport equipment and its networking are also briefly introduced.
本文介绍了光同步数字系列的基本概念、特点及其与PDH 的比较，并简要介绍了目前商用SDH传送设备及其组网情况。
This paper introduces the basic concept and features of SDH as compared with PDH. The available SDH transport equipment and its networking are also briefly introduced.
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