control network element的用法和樣例：
例句
- Traffic Management Services and Information Model for Interfaces between Operations Systems and Networks Elements.
在運行系統與網元間介面的業務管理服務和信息模型。 - End-to-end delay has three components.Delay can be introduced in the network as serialization delay, propagation delay, or NE processing delay.
端到端的時延包含三各部分，它們是串列時延，傳播時延，網元處理時延。
