DIN EN 61753-089-2-2013 光纤互连设备和无源元件.性能标准.第089-2部分:C类非连接单模双向光时域反射计(OTDR)监控的WWDM设备.受控环境(IEC 61753-089-2-2013).德文版本EN 61753-089-2-2013
Fibre optic interconnecting devices and passive components - Performance standard - Part 089-2: Non-connectorized single-mode bidirectional OTDR monitoring WWDM devices for category C - Controlled environment (IEC 61753-089-2:2013); German version EN 6175