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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| YD/T 1957.1-2009 |
Techincal Requirements for Automatically Switched Optical Network(ASON)Node. Part1:Technical Requirements for SDH-based ASON Node 自动交换光网络（ason）节点设备技术要求 第1部分：基于同步数字体系（sdh）的ason节点设备 |
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