本临时欧洲电信标准（I-ETS）适用于单模光传输网络中使用的平衡光纤分支设备。不平衡光纤分支装置也应满足类似的机械和环境要求。其范围是确定以下方面的最低统一要求:-光学、环境和机械性能；-试验条件；-验收标准。一些用户可能有额外的具体要求，例如需要在较低温度下验证性能。这些用户应指定符合基本ETSI性能标准的连接器，以及附加测试或更严格的测试条件。 验收标准将根据本I-ETS中规定的某些参数可能受测量或校准误差产生的测量不确定度影响的情况进行解释。除非另有规定，否则试验方法应符合EN 181 000。光纤分路装置是一种无源光学元件，它将输入信号（M）分为多个输出信号（N）。

This Interim European telecommunications Standard (I-ETS) applies to balanced fibre branching devices to be used in single mode optical transmission networks. Unbalanced fibre branching devices should also satisfy similar mechanical and environmental requirements. The scope is to establish minimum uniform requirements for the following aspects: - optical, environmental and mechanical properties; - test conditions; - acceptance criteria. Some users may have additional specific requirements, such as a need to verify perfprmance at lower temperatures. These users should specify connectors conforming to the basic ETSI performance standard, plus additional tests or more severe test conditions. Acceptance criteria will be interpreted with respect to the condition that some of the parameters specified in this I-ETS may be affected by measurement uncertainty arising either from measurement or calibration errors. Test methods are in accordance with EN 181 000 unless otherwise specified. A fibre branching device is : A passive optical component which splits the incoming signal (M) to a number of outputs (N).