连接 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