光纤是服务提供商最重要的资产之一。大多数，如果不是的话 总的来说，它的收入通过不同类型的光纤和不同类型的光纤传输 网络，如长途、大都市或企业。保护这个 投资是服务提供商和专用网络的关键。电缆负责防止光纤受到有害介质的影响，例如 湿度、机械应力和化学物质。精心设计和安装 电缆可以使光纤正常工作20年或更长时间。 为了到达用户，电缆必须穿过最不适宜居住的地方 下面的环境，如寒冷潮湿的地下室、炎热干燥的沙漠 河流和海洋、高压电线等。因此，电缆和光纤一样，必须符合特定的要求 应用程序，可以将其组件推向极限。目的是什么 本文件旨在描述应用环境和电缆类型，以及 提供在何种环境下应使用何种电缆类型的指南。

Fiber optics is one of the most important assets of a service provider. Most, if not all, of its revenue passes through different types of fibers in different types of networks, such as long haul, metropolitan or enterprise. Protecting this investment is key to the service providers and private networks.Cables are responsible for keeping the fibers from harmful agents such as humidity, mechanical stresses and chemicals. Well-designed and installed cables can maintain fibers operating properly for 20 years or more. In order to reach users the cables must pass through the most inhospitable environments, such as cold and humid undergrounds, hot and dry deserts, below rivers and oceans, high-voltage power lines, etc.Because of that, cables, the same way as fibers, must comply with specific applications, which can push their components to their limits. The purpose of this document is to characterize application environments and cable types, and provide guidance on which cable types should be used in which environments.