连接

1. SDH&OTN （https://www.bilibili.com/video/BV1sB4y1j7z6/?vd_source=d915f81082b9b8b8bb41b1f21e427157）

2. https://info.support.huawei.com/info-finder/encyclopedia/zh/index.html

3. https://www.juniper.net/cn/zh/research-topics.html