讨论了采用波分复用技术扩容鹰厦线永厦段通信传输链路的方案。
A plan about the application of WDM system in extending the capacity of existing communication transmission link of Yongxia section on Yingxia Railroad is discussed.
而网络电话系统便无需如此高的成本：一台电脑就能够轻易地处理大量电话线和扩容 —只需为您的网络添购更多线路便能获得最佳的升级！
Not so with a VOIP phone system: a standard computer can easily handle a large number of phone lines and extensions – just add more phones to your network to expand!
传统电话系统更新换代的方法是添加更多电话线或扩容，这通常要求昂贵的硬件升级。
Proprietary systems are easy to outgrow: Adding more phone lines or extensions often requires expensive hardware upgrades.
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