[求助]如何理解SDH与ATM，他们同时存在么？那么他们的关系是什么呢？

zergling

<font size="3">小弟我今天看传输资料，有这么一句话，<font color="#ff0000"><span style="FONT-SIZE: 10.5pt; LINE-HEIGHT: 125%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">“</span><strong><span style="FONT-SIZE: 10.5pt; LINE-HEIGHT: 125%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">确保了</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; LINE-HEIGHT: 125%; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">DH</span><span style="FONT-SIZE: 10.5pt; LINE-HEIGHT: 125%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">向</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; LINE-HEIGHT: 125%; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">SDH</span><span style="FONT-SIZE: 10.5pt; LINE-HEIGHT: 125%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">及</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; LINE-HEIGHT: 125%; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">SDH</span><span style="FONT-SIZE: 10.5pt; LINE-HEIGHT: 125%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">向</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; LINE-HEIGHT: 125%; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">ATM</span></strong></font><span style="FONT-SIZE: 10.5pt; LINE-HEIGHT: 125%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: &quot;Times New Roman&quot;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><font color="#ff0000"><strong>的顺利过渡</strong>。”</font>SDH向ATM过渡是什么意思？他们不是不同作用么？一个是传输，一个是交换啊？</span>SDH与ATM怎么区别呢？这个怎么理解呢？现在的运营商都是怎么应用的呢？请高人指教，我是一个学通信的学生，没接触过设备，迷惑中~~~~~</font>

[此贴子已经被编辑于2008-4-21 0:46:07编辑过]