本临时欧洲电信通信标准（I-ETS）适用于单模光纤传输网络中使用的光纤尾纤固定衰减器，其设计用于拼接到光路中。这包括为产生衰减而制造的接头，并配有适当的保护装置。它不包括可变衰减器或基于连接器的衰减器。本I-ETS旨在建立以下方面的统一要求:-光学、环境和机械性能；-试验条件；-验收标准。验收标准的解释应考虑到thsi I-ETS中规定的某些参数可能会受到测量或校准误差产生的测量不确定度的影响。光衰减器是一种无源光学元件，当插入光路时，它会产生受控的信号衰减。

This Interim European Telcommunication Standard (I-ETS) applies to optical fibre pigtailed fixed attenuators to be used in single-mode optical fibre transmission networks and which are designed to be spliced into the optical path.This includes splices which are fabricated to produce an attenuation and which are fitted with an appropriate protector. It does not include variable attenuators or attenuators that are based on connectors. This I-ETS is intended to establish uniform requirements for the following aspects: - optical, environmental and mechanical properties; - test conditions; - acceptance criteria. Acceptance criteria will be interpreted with respect to the consideration that some of the parameters specified in thsi I-ETS may be affected by measurement uncertainty arising either from measurement or calibration errors. The optical attenuator is: A passive optical component which produces a controlled signal attenuation when inserted in an optical path.