本临时欧洲电信标准I-ETS规定了单模光纤电信系统中使用的连接器组的要求；该范围涵盖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。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。属于本I-ETS范围内的不同应用的连接器有共同的环境和机械稳定性要求，但有两级衰减要求和四级回波损耗。衰减等级指定为P和Q。回波损耗等级指定为S、T、U和V。连接器组定义为: 整套连接器组件需要在一对或多对光纤之间提供可拆卸的耦合。连接器每侧的光纤或电缆长度应至少为1.5米。试验装置每侧的最小长度为1.5 m，必须暴露在所有气候和环境试验的试验条件下。

This Interim European Telecommunication Standard I-ETS specifies requirements of the connector set to be used in single-mode optical fibres telecommunication systems; the scope covers establishment of 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. Connectors for different applications which fall within the scope of this I-ETS have common environmental and mechanical stability requirements, but there are two grades of attenuation requirements and four grades of return loss. The attenuation grades are designated P and Q. The return loss grades are designated S, T, U and V. A connector set is defined as: The complete set of connector components require to provide demountable coupling between one or more pairs of optical fibre. The lenght of fibre or cable on each side of the connector shall be 1,5 metres (minimum). A minimum lenght of 1,5 m on each side of the test set must be exposed to the test conditions of all climats and environmental test.