| 词条 | the synchronous optical network (SONET) Standardized digital transmission rates for the synchronous digital hierarchy (SDH), and the optical carrier (OC) hierarchy |
| 释义 | SeeStandardized digital transmission rates for the synchronous digital hierarchy (SDH), the synchronous optical network (SONET), and the optical carrier (OC) hierarchy |
| 随便看 |
百科全书收录100133条中英文百科知识，基本涵盖了大多数领域的百科知识，是一部内容开放、自由的电子版百科全书。